14functions.cpp

#include <iostream>
using namespace std;

int sum(int a, int b) // this is a function that takes arguments and performs a task which can be called elsewhere as many times as you want
{
    return a + b;
}
// a function can't be written after the main function as it will throw error, to do that mention the prototype of the function before the main
// PROTOTYPE FUNCTION
int division(int, int); // no variables is also a valid option

void greet() //this is a void function which requires no return values
{
    cout<<"Hello and good morning user"<<endl;
}
int main()
{
    int num1, num2; //num1 and num2 are actual parameters that have the value and give it to formal parameters
    cout << "Enter num1" << endl;
    cin >> num1;
    cout << "Enter num2" << endl;
    cin >> num2;
    cout << "The sum of num1 and num2 is " << sum(num1, num2) << endl;
    cout << "The division of num1 and num2 is " << division(num1, num2) << endl;
    greet();
    return 0;
}
int division(int a, int b)
{
    //here a and b are formal parameters that take value from actual parameters
    return a / b;
}
//formal parameters and actual parameters can have the same name or different names