Calling Functions

#include <iostream>
using namespace std;
void voidFunction();    // Declaring a void function
int getSum(int, int);   // Declaring a function that takes two int arguments and returns their sum
int main()
{
    int sum;
    voidFunction();        // Calling the function with the void return type
    sum = getSum(2,3);    // Calling the function getSum and saving the value returned in variable 'sum'
    cout << "The value of sum is: " << sum << endl;
    return 0;
}
void voidFunction()      // Writing the function definition
{
    cout << "This is a void function!" << endl;  // Function only prints a string
}
int getSum(int num1, int num2)    // Writing the function definition 
{
    // The value 2 has been passed as num1
    // The value 3 has been passed as num2
    return num1 + num2;      // Returning the sum of num1 and num2
}