Comments on: 3.2 — Arithmetic operators

By: Mitul Golakiya

Mitul Golakiya — Wed, 18 Jun 2008 09:22:15 +0000

/* Program to know Number is Odd, Even OR Zero */

/* In torbo C++ , There are not bool Data-Type */

#include
#include

void main()
{
int value;
clrscr();
cout << "n Enter the value : ";
cin >> value;
if(value == 0)
{
cout << "n You have enterd zero.";
}
else if(value % 2 == 0)
{
cout << "n You have enterd even number.";
}
else
{
cout << "n Tou have enterd odd number.";
}
getch();
}

/* End of Program */

By: Learn C++ - » 3.1 — Precedence and associativity

Learn C++ - » 3.1 — Precedence and associativity — Wed, 23 Apr 2008 02:34:04 +0000

[...] « Three questions that need to be answered before you start writing your game | Home | 3.2 — Arithmetic operators » Wednesday, June 13th, 2007 at 3:55 [...]

By: Learn C++ - » 3.3 — Increment/decrement operators, and side effects

Learn C++ - » 3.3 — Increment/decrement operators, and side effects — Wed, 23 Apr 2008 01:50:42 +0000

[...] 2007 Prev/Next Posts « 3.2 — Arithmetic operators | Home | 3.4 — Sizeof, comma, and arithmetic if operators » Wednesday, June 13th, [...]

By: Chad Bernier

Chad Bernier — Sun, 02 Mar 2008 22:21:06 +0000

I don’t understand. That uses more advanced stuff than stated so far.

By: Ivailosp

Ivailosp — Sat, 26 Jan 2008 12:03:24 +0000

bool isEven(int x) {
	return !(x&1);
}

int main() {
	int x;
	std::cout << "Enter a Number: ";
	std::cin >> x;
	std::cout << (isEven(x) ? "even" : "odd");
	return 0;
}

By: Allen01

Allen01 — Sat, 26 Jan 2008 06:56:02 +0000

Ok, figured it out, adjusted the main cout based on the IsEven condition.

bool IsEven(int x)
{
    // if x % 2 == 0, 2 divides evenly into our number
    // which means it must be an even number

    if (x % 2 == 0)
        return true;
    else
        return false;
}

int main()
{
using namespace std;
cout << "Enter a Number" << endl;
int x;
cin >> x;

if (IsEven(x))
	cout << "Even integer, returned true" << endl;
	
else 
	cout << "odd interger, returned false" << endl;

return 0;
}

By: Alex

Alex — Sat, 26 Jan 2008 05:14:43 +0000

The return value of main is passed back to whomever launched your program (either another program, or the operating system). What happens with this value is up to the caller. If you want this value to print out, you should print it before you return it.

By: Allen01

Allen01 — Sat, 26 Jan 2008 02:54:32 +0000

Working on exercise 2), I first tried the code below. It compiled but when run, the command prompt only displayed: “Press any key to continue…” Shouldn’t it have displayed a “1″ since it did return as true?

int main()
{
using namespace std;

bool IsEven(int x);
int x = 4;

if (x % 2 == 0)
return true;
else
return false;

return 0;
}

I experimented a bit a finally got the code below to work:

int main()
{
using namespace std;

bool IsEven(int x);
int x = 4;

if (x % 2 == 0)
cout < < "My name is Even Steven" << endl;
else
cout << "My name is NOT Even Steven" << endl;

return 0;
}

This time, the output was “My name is Even Steven”, showing that 4 was an even integer.

Why would it not output a 1 for the true condition in the top code?