Num is even number

Function with arguments and no return value: - In the below program, a positive number is first asked from the user which is stored in the variable num. Then, the num is passed to the is_even() function where, whether the number is even or not is checked and printed. Since the return type of is_even() is a void, no value is returned from the function.

Code:

#include<bits/stdc++.h>
using namespace std;

// Return type of function is void so it will not return any value.
void is_even(int num) {

  if (num % 2 == 0) {
    cout << "Num is even number";
  } else {
    cout << "Num is odd number";
  }
}

int main() {
  // Number as an argument is passed to is_even()
  int num=4;
  is_even(num);
  return 0;
}

Output: Num is even number

Function with arguments and a return value: - In the below program, a positive integer is asked from the user and stored in the variable num. Then, num is passed to the function is_even() where, whether the number is even or not is checked. Since, the return type of is_even() is a bool, “true” or “false” is returned to the main() calling function. If the number is an even number, “true” is returned. If not, “false” is returned. Back in the main() function, the returned boolean value “true” or “false” is stored in the variable flag, and the corresponding condition is printed onto the screen.

Code:

#include<bits/stdc++.h>
using namespace std;

// Return type of function is bool so it either return a true of false.
bool is_even(int num)
{

    if (num % 2 == 0)
    {
        return true;
    }
    else
    {