help understanding bool

**volk** · 04-05-2003

Code:

#include <iostream>
using namespace std;

bool isEven(int);

int main()
{
	int val;

	cout << "Enter an integer and I will tell you ";
	cout << "if it is even or odd: ";
	cin  >> val;
	
	if (isEven(val))
		cout << val << " is even.\n";
	else
		cout << val << " is odd.\n";
            
            return 0;
}

bool isEven(int number)
{
	bool status;

	if (number % 2)
		status = false; 
	else
		status = true; 
	
	return status;
}

Can someone explain the status being false or true in the function definition? I thought it would be the other way around.

**nextus** · 04-05-2003

edited out

**CheesyMoo** · 04-05-2003

The if(number%2)
statement equals 0 if the number is even or something else if it is odd, 0 is ineterpreted as false in an if statement, so if it's even the if statement is false, if it's not it is true.

So if you enter 2, 2 % 2 = 0, therefore, the if statement is false, it goes to the else, isEven returns true.

**abrege** · 04-05-2003

Code:

bool isEven(int number)
{
	bool status;

	if (number % 2)
		status = false; 
	else
		status = true; 
	
	return status;
}

hmmm....

Code:

bool isEven(int number)
{
     return (number % 2);
}

**CheesyMoo** · 04-05-2003

That would make it return false if it was even.
Would:

Code:

bool isEven(int num)
{
    return !num % 2;
}

Work?

**abrege** · 04-05-2003

indeed

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