Comments on: 1.11 — Comprehensive quiz

By: xero

xero — Tue, 15 Nov 2011 18:33:41 +0000

i believe the problem lies at void WriteAnswer()
as far as my understanding goes you need to declare a variable, which can hold return value from ReadNumbers() function.
segment of my code was as follows:
void WriteAnswer()
int z = ReadNumbers()
cout << "Sum of both numbers is " << z << endl;
and my main was just like yours.
Someone please correct me if i am wrong.

By: xero

xero — Tue, 15 Nov 2011 10:57:24 +0000

Another thing, you said in some section that using cout in some function with void return type would create a compiler error, however we see void WriteAnswer() working fine, how?

By: xero

xero — Tue, 15 Nov 2011 09:54:07 +0000

First of all I would like to thank you a lot for providing such a holistic and easy to understand material on C++. Its really fun learning with you. Thank you again.
After having gone through Quiz 1, I have following queries:
1. int WriteAnswer() can be used instead of void WriteAnswer(), code works perfectly alright with this. Whats really the difference between both.
2. Will there be detailed section on different/preferential ways on piping input/output results between/among function?
3. Following is my code on Q1 Quiz 1 (I was only able to get my code running only after going through the solution). I would appreciate few comments.

#include //Quiz 1 my solution after consulting answer from learncpp(dot)com

int ReadNumber()
{
using namespace std;
int x;
int y;
cout <> x;
cout <> y;
return x+y;
}

void WriteAnswer()
{
using namespace std;
int z = ReadNumber();
cout << "Sum of Both Numbers is " << z << endl;
}

int main()
{
WriteAnswer();
return 0;
}

By: lelouche_z

lelouche_z — Mon, 07 Nov 2011 15:15:16 +0000

haha.. grabeh wla akong idea panu ko siya gagawin..
XD

more practice needed.. :D

By: Trophy

Trophy — Wed, 02 Nov 2011 06:12:36 +0000

I’m sorry to reply to your comment even though this has nothing to do with it, but I can’t figure out how to comment without replying. Anyway, there’s a problem with your code. Basically you’re telling the compiler to go to main.cpp to io.h and then to io.cpp, but that isn’t how the compiler reads it, the compiler reads it as main.cpp to io.h to main.cpp which causes the compiler to stop before “ReadNumber()” and “WriteAnswer()” are defined, even though they’ve been declared. I kept getting “undefined reference” error, because of the way the program was set up, so I put ‘#include “io.cpp”‘ in the header file and it worked again, which revealed the problem. Am I wrong, or is my compiler just not set up correctly?

By: Vastor

Vastor — Mon, 10 Oct 2011 01:58:33 +0000

And… this is my trial… :D

File : main.cpp

#include
#include “nUser_input.h”
#include “nSum.h”

using namespace std;

int main()
{
int nResult;
int y;
nResult = WriteAnswer(y);
cout << "Sums of the two number: " << nResult << endl;
return 0;
}

File : nSum.h

#ifndef NSUM_H_INCLUDED
#define NSUM_H_INCLUDED

int WriteAnswer(int x)
{
int nInput_1 = Read_Number();
int nInput_2 = Read_Number();
return nInput_1 + nInput_2;
}

#endif // NSUM_H_INCLUDED

File : nUser_input.h

#ifndef NUSER_INPUT_H_INCLUDED
#define NUSER_INPUT_H_INCLUDED

#include

using namespace std;

int Read_Number()
{
cout <> nInput;
return nInput;
}

#endif // NUSER_INPUT_H_INCLUDED

really wonder what to do when the instruction tell can’t use function to sum up the number input, so i just use return x + y ‘trick’…. xD

By: zingmars

zingmars — Mon, 19 Sep 2011 16:31:42 +0000

Operation needs to be a char, not an int.
When comparing things, use two equals sign.

By: Hex

Hex — Sat, 17 Sep 2011 16:46:08 +0000

#include “stdafx.h”
#include

int Number1;
int Number2;
int Operation;
int Result;

int Getnumbers()
{
using namespace std;
cout <> Number1;
cout <> Number2;
return (0);
}
int Getoperation()
{
using namespace std;
cout <> Operation;
return (Operation);
}
int Calculate(int, char, int)
{
if (Operation = ‘+’)
return Number1+Number2;

if (Operation = ‘-’)
return Number1-Number2;

if (Operation = ‘*’)
return Number1*Number2;

if (Operation = ‘/’)
return Number1/Number2;

return (0);
}
void Printresult(int)
{
using namespace std;
cout << "Your Result Is " << Result << endl;
}

int main()
{
Getnumbers();
Getoperation();
Result = Calculate(Number1, Operation, Number2);
Printresult(Result);

}
sorry this is the real code my computer failed

By: Hex

Hex — Sat, 17 Sep 2011 16:44:08 +0000

#include “stdafx.h”
#include

int Number1;
int Number2;
int Operation;
int Result;

if (Operation = ‘-’)
return Number1-Number2;

if (Operation = ‘*’)
return Number1*Number2;

if (Operation = ‘/’)
return Number1/Number2;

return (0);
}
void Printresult(int)
{
using namespace std;
cout << "Your Result Is " << Result << endl;
}

int main()
{
Getnumbers();
Getoperation();
Result = Calculate(Number1, Operation, Number2);
Printresult(Result);

}
this is my calculator code but it will only add the two numbers instead of any thing else. Help im a N00B.

By: quack

quack — Fri, 16 Sep 2011 04:50:09 +0000

Hey Kamakasy, I think you have a typo. Change “unfdef” to “ifndef”.