Question

Write a function called isEven() that uses the remainder (modulus) operator (%) to determine when an integer is even. The function should take an integer argument called myNumber passed from within the for loop and return true if the integer is even and false otherwise. Your program should determine what numbers are even and odd from 1 to 20 using the isEven() function. Your counter variable in the for loop should be called num.

Answer 1

#include <stdio.h>

/**
* Function to check even or odd
* Returns 1 is num is even otherwise 0
*/
int isEven(int myNum)
{
    return !(myNum & 1);   // bitwise operator & to check even or odd numbers.
}

int main()
{
    int num; //declare num variable to run the for loop from 1 t0 20
  
    for(num=1; num<=20; num++)
    {
        // If isEven() function returns 0 then the number is even
        if(isEven(num)) //function isEven number with num parameter to check even and odd number
        {
            printf("%d Number is even\n",num);   //prints num if even
        }
        else
        {
           printf("%d Number is odd\n",num);   //prints num if odd
       }
    }
  
    return 0;
}

output: