2.2 — Function return values

By Alex on February 1st, 2019 | last modified by Alex on June 12th, 2019

Consider the following program:

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#include <iostream>   int main() { // get a value from the user std::cout << "Enter an integer: "; int num{}; std::cin >> num;   // print the value doubled std::cout << num << " doubled is: " << num * 2 << '\n';   return 0; }

This program is composed of two conceptual parts: First, we get a value from the user. Then we tell the user what double that value is.

Although this program is trivial enough that we don’t need to break it into multiple functions, what if we wanted to? Getting an integer value from the user is well-defined job that we want our program to do, so it would make a good candidate for a function.

So let’s write a program to do this:

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// This program doesn't work #include <iostream>   void getValueFromUser() { std::cout << "Enter an integer: "; int input{}; std::cin >> input;   }   int main() { getValueFromUser(); // Ask user for input   int num{}; // How do we get the value from getValueFromUser() and use it to initialize this variable?   std::cout << num << " doubled is: " << num * 2 << '\n';   return 0; }

While this program is a good attempt at a solution, it doesn’t quite work.

When function getValueFromUser is called, the user is asked to enter an integer as expected. But the value they enter is lost when getValueFromUser terminates and control returns to main. Variable num never gets initialized with the value the user entered, and so the program always prints the answer 0.

What we’re missing is some way for getValueFromUser to return the value the user entered back to main so that main can make use of that data.

Return values

When you write a user-defined function, you get to determine whether your function will return a value back to the caller or not. To return a value back to the caller, two things are needed.

First, your function has to indicate what type of value will be returned. This is done by setting the function’s return type, which is the type that is defined before the function’s name. In the example above, function getValueFromUser has a return type of void, and function main has a return type of int. Note that this doesn’t determine what specific value is returned -- only the type of the value.

Second, inside the function that will return a value, we use a return statement to indicate the specific value being returned to the caller. The specific value returned from a function is called the return value. When the return statement is executed, the return value is copied from the function back to the caller. This process is called return by value.

Let’s take a look at a simple function that returns an integer value, and a sample program that calls it:

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// int is the return type // A return type of int means the function will return some integer value to the caller (the specific value is not specified here) int return5() {     // the return statement indicates the specific value that will be returned     return 5; // return the specific value 5 back to the caller }   int main() {     std::cout << return5() << '\n'; // prints 5     std::cout << return5() + 2 << '\n'; // prints 7       return5(); // okay: the value 5 is returned, but is ignored since main() doesn't do anything with it       return 0; }

When run, this program prints:

5
7

Execution starts at the top of main. In the first statement, the function call to return5 is evaluated, which results in function return5 being called. Function return5 returns the specific value of 5 back to the caller, which is then printed to the console via std::cout.

In the second function call, the function call to return5 is evaluated, which results in function return5 being called again. Function return5 returns the value of 5 back to the caller. The expression 5 + 2 is evaluated to produce the result 7, which is then printed to the console via std::cout.

In the third statement, function return5 is called again, resulting in the value 5 being returned back to the caller. However, function main does nothing with the return value, so nothing further happens (the return value is ignored).

Note: Return values will not be printed unless the caller sends them to the console via std::cout. In the last case above, the return value is not sent to std::cout, so nothing is printed.

Fixing our challenge program

With this in mind, we can fix the program we presented at the top of the lesson:

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#include <iostream>   int getValueFromUser() // this function now returns an integer value { std::cout << "Enter an integer: "; int input{}; std::cin >> input;     return input; // return the value the user entered back to the caller }   int main() { int num { getValueFromUser() }; // initialize num with the return value of getValueFromUser()   std::cout << num << " doubled is: " << num * 2 << '\n';   return 0; }

When this program executes, the first statement in main will create an int variable named num. When the program goes to initialize num, it will see that there is a function call to getValueFromUser, so it will go execute that function. Function getValueFromUser, asks the user to enter a value, and then it returns that value back to the caller (main). This return value is used as the initialization value for variable num.

Compile this program yourself and run it a few times to prove to yourself that it works.

Void return values

Functions are not required to return a value. To tell the compiler that a function does not return a value, a return type of void is used. Let’s look at the doPrint() function from the previous lesson:

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void doPrint() // void is the return type {     std::cout << "In doPrint()" << '\n';     // This function does not return a value so no return statement is needed }

This function has a return type of void, indicating that it does not return a value to the caller. Because it does not return a value, no return statement is needed (trying to return a specific value from a function with a void return type will result in a compilation error).

Here’s another example of a function that returns void, and a sample program that calls it:

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// void means the function does not return a value to the caller void returnNothing() {     std::cout << "Hi" << '\n';     // This function does not return a value so no return statement is needed }   int main() {     returnNothing(); // okay: function returnNothing() is called, no value is returned       std::cout << returnNothing(); // error: this line will not compile.  You'll need to comment it out to continue.       return 0; }

In the first function call to function returnNothing, the function prints “Hi” and then returns nothing back to the caller. Control returns to main and the program proceeds.

The second function call to function returnNothing won’t even compile. Function returnNothing has a void return type, meaning it doesn’t return a value. However, this statement is trying to send the return value of returnNothing to std::cout to be printed. std::cout doesn’t know how to handle this (what value would it output?). Consequently, the compiler will flag this as an error. You’ll need to comment out this line of code in order to make your code compile.

A void return type (meaning nothing is returned) is used when we want to have a function that doesn’t return anything to the caller (because it doesn’t need to). In the above example, the returnNothing function has useful behavior (it prints “Hi”) but it doesn’t need to return anything back to the caller (in this case, main). Therefore, returnNothing is given a void return type.

Returning to main

You now have the conceptual tools to understand how the main function actually works. When the program is executed, the operating system makes a function call to main. Execution then jumps to the top of main. The statements in main are executed sequentially. Finally, main returns an integer value (usually 0) back to the operating system. This is why main is defined as int main().

Why return a value back to the operating system? This value is called a status code, and it tells the operating system (and any other programs that called yours) whether your program executed successfully or not. By consensus, a return value of 0 means success, and a non-zero return value means failure.

Best practice

Your main function should return 0 if the program ran normally, or a non-zero value if it encountered an error and could not complete as expected.

Note that the C++ specification explicitly specifies that function main must return an int. Some compilers will invalidly let you specify a void return type (they will implicitly return 0 if you do this), but you should not rely on this.

For now, you should also define your main() function at the bottom of your code file, below other functions.

A few additional notes about return values

First, if a function has a non-void return type, it must return a value of that type (using a return statement). Failure to do so will result in undefined behavior. The only exception to this rule is for function main(), which will assume a return value of 0 if one is not explicitly provided. That said, it is best practice to explicitly return a value from main, both to show your intent, and for consistency with other functions (which will not let you omit the return value).

Best practice

Always explicitly provide a return value for any function that has a non-void return type.

Warning

Failure to return a value from a function with a non-void return type (other than main) will result in undefined behavior.

Second, when a return statement is executed, the function returns back to the caller immediately at that point. Any additional code in the function is ignored.

Third, a function can only return a single value back to the caller each time it is called. However, the value doesn’t need to be a literal, it can be the result of any valid expression, including a variable or even a call to another function that returns a value. In the getValueFromUser() example above, we returned a variable holding the number the user typed.

Finally, note that a function is free to define what its return value means. Some functions use return values as status codes, to indicate whether they succeeded or failed. Other functions return a calculated or selected value. Other functions return nothing. What the function returns and the meaning of that value is defined by the function’s author. Because of the wide variety of possibilities here, it’s a good idea to document your function with a comment indicating what the return values mean.

For example:

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// Function asks user to enter a value // Return value is the integer entered by the user from the keyboard int getValueFromUser() { std::cout << "Enter an integer: "; int input{}; std::cin >> input;     return input; // return the value the user entered back to the caller }

Reusing functions

Now we can illustrate a good case for function reuse. Consider the following program:

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#include <iostream>   int main() { int x{}; std::cout << "Enter an integer: "; std::cin >> x;   int y{}; std::cout << "Enter an integer: "; std::cin >> y;   std::cout << x << " + " << y << " = " << x + y << '\n';   return 0; }

While this program works, it’s a little redundant. In fact, this program violates one of the central tenants of good programming: “Don’t Repeat Yourself” (often abbreviated “DRY”).

Why is repeated code bad? If we wanted to change the text “Enter an integer:” to something else, we’d have to update it in two locations. And what if we wanted to initialize 10 variables instead of 2? That would be a lot of redundant code (making our programs longer and harder to understand), and a lot of room for typos to creep in.

Let’s update this program to use our getValueFromUser function that we developed above:

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#include <iostream>   int getValueFromUser() { std::cout << "Enter an integer: "; int input{}; std::cin >> input;     return input; }   int main() {     int x{ getValueFromUser() }; // first call to getValueFromUser     int y{ getValueFromUser() }; // second call to getValueFromUser       std::cout << x << " + " << y << " = " << x + y << '\n';       return 0; }

This program produces the following output:

Enter an integer: 5
Enter an integer: 7
5 + 7 = 12

In this program, we call getValueFromUser twice, once to initialize variable x, and once to initialize variable y. That saves us from duplicating the code to get user input, and reduces the odds of making a mistake. Once we know getValueFromUser works for one variable, it will work for as many of them as we need.

This is the essence of modular programming: the ability to write a function, test it, ensure that it works, and then know that we can reuse it as many times as we want and it will continue to work (so long as we don’t modify the function -- at which point we’ll have to retest it).

Best practice

Follow the DRY best practice: “don’t repeat yourself”. If you need to do something more than once, consider how to modify your code to remove as much redundancy as possible. Variables can be used to store the results of calculations that need to be used more than once (so we don’t have to repeat the calculation). Functions can be used to define a sequence of statements we want to execute more than once. And loops (which we’ll cover in a later chapter) can be used to execute a statement more than once.

Conclusion

Return values provide a way for functions to return a single value back to the function’s caller.

Functions provide a way to minimize redundancy in our programs.

Quiz time

Question #1

Inspect the following programs and state what they output, or whether they will not compile.

1a)

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#include <iostream> int return7() {     return 7; }   int return9() {     return 9; }   int main() {     std::cout << return7() + return9() << '\n';       return 0; }

Show Solution

This program prints the number 16.

1b)

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#include <iostream> int return7() {     return 7;       int return9()     {         return 9;     } }   int main() {     std::cout << return7() + return9() << '\n';       return 0; }

Show Solution

This program will not compile. Nested functions are not allowed.

1c)

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#include <iostream> int return7() {     return 7; }   int return9() {     return 9; }   int main() {     return7();     return9();       return 0; }

Show Solution

This program compiles but does not produce any output. The return values from the functions are not used for anything (and are thus discarded).

1d)

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#include <iostream> void printA() {     std::cout << "A\n"; }   void printB() {     std::cout << "B\n"; }   int main() {     printA();     printB();       return 0; }

Show Solution

This program prints the letters A and B on separate lines.

1e)

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#include <iostream> void printA() {     std::cout << "A\n"; }   int main() {     std::cout << printA() << '\n';       return 0; }

Show Solution

This program does not compile. Function printA() returns void, which main() tries to send to std::cout. This will produce a compile error.

1f)

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#include <iostream> int getNumbers() {     return 5;     return 7; }   int main() {     std::cout << getNumbers() << '\n';     std::cout << getNumbers() << '\n';       return 0; }

Show Solution

This program prints 5 twice (on separate lines). Both times when function getNumbers() is called, the value 5 is returned. When the return 5 statement is executed, the function is exited immediately, so the return 7 statement never executes.

1g)

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#include <iostream> int return 5() {     return 5; }   int main() {     std::cout << return 5() << '\n';       return 0; }

Show Solution

This program will not compile because the function has an invalid name.

1h) Extra credit:

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#include <iostream> int return5() {     return 5; }   int main() {     std::cout << return5 << '\n';       return 0; }

Show Solution

This program will compile, but the function will not be called because the function call is missing parenthesis. What actually gets output depends on the compiler.

Question #2

What does “DRY” stand for, and why is it a useful practice to follow?

Show Solution

DRY stands for “Don’t Repeat Yourself”. It is a practice that involves writing your code in such a way so as to minimize redundancy. This makes your programs more concise, less error prone, and more maintainable.

2.3 -- Introduction to function parameters and arguments

Index

2.1 -- Introduction to functions

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33 comments to 2.2 — Function return values

• VerticalLimit

  June 22, 2019 at 11:31 am · Reply

  Hi Nascardriver and Alex

  Please give me some pointers on how to fix this program. I have covered the study material up to S.4.2a thus this Q might be considered by you as "jumping the gun".. but nonetheless.

  small snipped of the program

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  userBirthDay.cpp   #include <iostream> #include "userBirthDate.h"   int userBirthDate() {     int day{};     int month{};     int_least32_t year{};     char ans;          std::cout << "Welcome to simple Astrology Program!\n";     do {     std::cout << "Enter the day of your birth then the month and then the year (space in between):";     std::cin >> day >> month >> year;       //In order to provide correct Astrological Sign verification of dates must take place                                                 std::cout << "Your birth day is " << day << "/" << month << "/" << year << '\n';     std::cout << "Press 'Y' for YES and 'N' for NO\n";     std::cin >> ans;     } while (ans == 'N' || 'n'); // there is slight logical error which I will fix       return (day, month, year); }   astroSign.h   #include<iostream> #include "astroSigns.h" #include "userBirthDate.h"   int astroSigns() {     int day{ 0 };     int month{ 0 };       int cusp{ userBirthDate() }; //Getting values from userBirthDate() and using to init this variable       if (day >= 19 || day <= 20 && month >= 4 )     {         std::cout << "Your are born on the cusp";     }     return (day, month); }   main.cpp   //Simple Astrology program #include<iostream> #include "userBirthDate.h" #include "astroSigns.h"     int main() {     astroSigns();     return 0; }

  What Iam trying to understand is after returning the values with  userBirthDate() and initialising them to int cusp{ userBirthDate() } I cant run simple if statement against it as compiler just ignores it. What am I doing wrong?
  P.S (There are few easier ways to write this program but I chose to make it little more challenging by applying what I have learned thus far (S.4.2a))

  • nascardriver

    June 22, 2019 at 11:22 pm · Reply

    Line 44: That's the comma operator, only `month` will be returned (Lesson O.3.4).
    Since `day` and `month` are very small, you can encode them into a single `int`, or a fixed-width integer.

    Assuming day < 256 and month < 256.

    Using bitwise operators

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    // We can use the lowest 8 bits to store the month // and the 8 bits prior to those to store the day. // You could swap them if you wanted to. return ((day << 8) | month);   // The caller can extract day and month like this int iEncoded{ astroSigns() }; int iDay{ (iEncoded & 0xFF00) >> 8 }; int iMonth{ iEncoded & 0xFF };

    Using arithmetic

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    // In decimal, using MMMDDD. eg. 123019 is month 123, day 19. // You need a 32 bit int for this. return ((day * 1000) + month);   // Extraction std::int_fast32_t iEncoded{ astroSigns() }; int iDay{ iEncoded / 1000 }; int iMonth{ iEncoded % 1000 };

    You'll learn about nicer ways of returning multiple values later.

    > I cant run simple if statement against it as compiler just ignores it
    You didn't include the code that you tried. Both `day` and `month` are 0 in your if-statement. `cusp` is unused. Your if-statement probably doesn't do what you intended.
    Make sure you set up your compiler according to lesson 0.10 and 0.11, it tells you what's wrong.

• chayim

  June 21, 2019 at 9:48 pm · Reply

  Why does example 1h compile to print 1?

  • nascardriver

    June 22, 2019 at 1:54 am · Reply

    When a function is used without being called, it evaluates to the function's address. `std::cout <<` doesn't know how to print function addresses, so it converts the address to a `bool`. Since the function's address is non-zero, the bool is true and "1" is printed.

• habeebullah

  June 18, 2019 at 5:03 am · Reply

  under the fixing our challenge example, i wrote the code again but I was having a compile error on line 9. The error was that I was using round brackets instead of braces. why can't I use the round brackets for the int

  1	int input()

  • nascardriver

    June 19, 2019 at 3:14 am · Reply

    That's a function declaration (Covered later in this chapter), not a variable declaration. Parentheses don't support default-initialization. Use brace initialization.

• Singh

  June 17, 2019 at 10:06 am · Reply

  You guys are amazing and really very helpful, highly appreciated. I am glad I found this tutorial to start learning C++.

  Query: How can we call the value of any variable initialized from main() to any function (such as below).

  [code]
  #include <iostream>

  int function()
  {
      int a, sub;
      std::cin>>a;
      sub=a+total;  //How can we get to value of total in here from Main function if possible?
      std::cout<<"Total of both Nub and A is " <<sub;
      
      return sub;
  }

  int main()
  {   int total;
      
      std::cin>>total;
      
      std::cout<<"Double to Sub is " <<function() *2; //here will be the double of sub from function.
  return 0;
  }
  [\code]

  So how can we get the value of Total from main to function? thanks in advance.

  • nascardriver

    June 17, 2019 at 10:22 am · Reply

    You need function parameters/arguments. They're covered in the next lesson.

• WLM

  June 15, 2019 at 4:55 am · Reply

  This is a wonderful tutor!Thank you!

  Question 1h is not compilled in my Code::Blocks. The reason given  is that return5 without parenthesis always will be true.

  • nascardriver

    June 15, 2019 at 5:01 am · Reply

    Hi!

    Your compiler prints a warning, because using a function like that is most likely undesired.
    Your compiler is treating warnings as errors, so it doesn't compile. This is a good setting, keep it like that.

• Napalm

  June 11, 2019 at 10:46 am · Reply

  When you start a new console project in visual studio, and the "return 0;" in main() is absent, seemingly by design. I'm sure it used to be be included automatically.

  I remember reading a thread on stack exchange some months ago where someone submitted code for review, and someone actually advised them "return 0 is not needed".

  Is there a case where it is absolutely necessary to include return 0?

  I'd be interested to know some thoughts on this considering this tutorial seems to favour using up to date syntax and breaking old and/or bad habits.

  • nascardriver

    June 12, 2019 at 2:58 am · Reply

    You never need to return 0 from `main`. If you omit `main`'s return statement, 0 is returned.
    For consistency with all other functions, you should include `return 0` in `main`, even if it doesn't change the outcome.

• Chayim

  June 7, 2019 at 12:01 am · Reply

  You did not mention that it's able to cout next line by \n shortly and it's not a must to use endl ,and also that in an expression it's needed ' ' left and right of \n '\n'.

• Chayim

  June 6, 2019 at 11:54 pm · Reply

  Why do you need to enter 0 in the "int num" {0}? it's working { } without anything in it.

  • nascardriver

    June 7, 2019 at 3:03 am · Reply

    You don't need to do that. Empty curly braces initialize to the default value, which is 0.
    If you're using the initial value (ie. you're not overriding it immediately), explicitly writing `{ 0 }` can be easier to understand.

    • Chayim

      June 7, 2019 at 4:00 am · Reply

      Even if I enter any number like 6 or 7 it compiles the same.

      • nascardriver

        June 7, 2019 at 4:03 am · Reply

        Because it gets overridden by `std::cin >>`

• yiğit eren

  April 13, 2019 at 5:02 pm · Reply

  alex is this c++ 11 because i did this in my atom editor but i must do this int x(); because if i tried to do this int x{}; it's give me an error so this is different version or look like something???

  • Alex

    April 14, 2019 at 8:09 am · Reply

    Curly-brace initialization is C++11.

• yeko

  April 12, 2019 at 8:24 am · Reply

  yeah good lesson but but in this lesson (i think only this one) i think not so boring  but i think it's boring little bit. Um how can i do like sometimes i don't want to read documentation i just read your blog not watch videos (c++). Yeah i said sometimes i am feel like "ah come on watch some league of legends and one more and watch how much you want" but i know i can't do this i am challenge my self what can i do???

• abhijeet

  February 26, 2019 at 8:17 am · Reply

  can anyone explain me the output of 1h). i'm getting 1 as output. i don't know how its working. it should have thrown error because of return5 in main function right?

  • nascardriver

    February 26, 2019 at 8:24 am · Reply

    https://www.learncpp.com/cpp-tutorial/function-return-values/comment-page-1/#comment-396300

• Wilson

  February 24, 2019 at 12:30 pm · Reply

  Hi Alex,

  Thanks for writing this useful guide! I have a quick question..

  For "Extra Credit", my initial guess would've been it will not compile nor run properly. However, I've ran it and have gotten a random number (as you've pointed out).

  Why is it able to compile and output a result when the variable "return5" has not been instantiated?

  • nascardriver

    February 25, 2019 at 4:32 am · Reply

    Hi Wilson!

    Using a function without calling it (ie. without ()), gives you the address of the function (Where it lives in memory).
    @std::cout doesn't know how to print function addresses, so it converts it to a bool.
    Every non-zero value is true, so the program prints 1, or, if you set @std::boolalpha, true.

• Helliarc

  February 21, 2019 at 9:49 am · Reply

  I'm trying to build the logic in my mind, and the function in the return example has me "asking questions"...  Is it standard to ask a question before deciding where to place the answer?  Shouldn't we have a place to put an answer before we ask the question?  I'm just asking as a formatting perspective, I feel like if I'm going to ask the user for information, I should define the place the user will place the information, and what to do with it, before I ask them the question(cout << "the question"), but I can also see how it is more logical to ask the question, and define the location before we prompt for input in 'cin' so that we know 'cin' will be placed in the preceding int variable memory location, for readability purposes...  I'm just making sure that the way you have written it is the "right" way, if it doesn't matter, or if it should be changed...

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  int getValueFromUser() // this function now returns an integer value {     std::cout << "Enter an integer: ";     int input{ 0 }; //Logically, shouldn't we define a variable before we ask the user a question???  So this definition should come before the cout?     std::cin >> input;       return input; // return the value the user entered back to the caller }

  • Alex

    February 22, 2019 at 12:56 pm · Reply

    The rule of "define a variable as close to its first use as possible" indicates that it should go after the std::cout, because the output line doesn't need it.

    But in reality, it doesn't matter that much which comes first. The rule is there to ensure you're not doing things like defining all your variables at the top of the function, or somewhere far away from where you use them. It's not worth quibbling over a line or two.

    • Helliarc

      March 9, 2019 at 8:34 pm · Reply

      I really appreciate your diligence in trying to answer every question here...  Just saying thank you!  I'm on chapter 5.11 right now, going through your tutorials step by step.  Can't wait for OOP! You're doing a fine thing here for people that are willing to learn.

• Richard Thendernall

  February 17, 2019 at 3:42 pm · Reply

  Yo I am able to understand that
  int return7()
  {
      return 7;
  }

  int return9()
  {
      return 9;
  will equal 16 but I do not get why or how or what this works. PLEASE EXPLAIN

  • Alex

    February 18, 2019 at 8:08 pm · Reply

    When this expression statement is evaluated:

    1	std::cout << return7() + return9() << '\n';

    return7() calls the return7 function, which returns the value 7. return9() calls the return9 function, which returns the value 9.

    If we plug in those intermediate values, we get this:

    1	std::cout << 7 + 9 << '\n';

    Which should make it clearer where 16 is coming from.

• Vladislav Trnka

  February 5, 2019 at 7:55 am · Reply

  Sentence 'Now we have can illustrate a good case for function reuse.' does not make sense.

  • Alex

    February 7, 2019 at 6:13 am · Reply

    I can has grammar. Fixed!

• Maria

  February 3, 2019 at 8:48 am · Reply

  Under the Fixing Our Program example. On line 14 isn't the semi-colon supposed to be outside the brackets. When I tried to compile, it would give me some errors

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  #include <iostream> int getValueFromUser() // this function now returns an integer value {     std::cout << "Enter an integer: ";     int input{ 0 };     std::cin >> input;       return input; // return the value the user entered back to the caller } int main() {     int num { getValueFromUser(); } // initialize num with the return value of getValueFromUser()     std::cout << num << " doubled is: " << num * 2 << '\n';     return 0; }

  • Alex

    February 4, 2019 at 8:44 pm · Reply

    Yup. Fixed! Thanks for pointing this out.