Simple function that sums up 2 numbers

Question

Creating a function after main () executes but called inside main () block of code and also declaring its name before main () starts executing.

Answer 1

/* we'll create a simple function that adds up
the sum of 2 inputs from user but we will
create it after main () executes yet we will
call it within main () block of code. that is
in fact our goal here :) for that to work
properly we also need to declare its name
before main () statrs executing. here we go :)
*/

#include <iostream>
using namespace std;

int myFunction ();

/* notice the semicolon at
the end of myFunction (), remeber that always
when you code like this -> (execute main () and
then create your functions)
*/

// now the program tarts xecuting

int main()

{
return myFunction (); // simple statement :)
}

// and now we create our function that adds up 2 numbers from user input here below

int myFunction ()
{
int a, b, sum;
cout << "Please enter a number: " << endl;
cin >> a;
cout << "Please enter another number: " << endl;
cin >> b;
sum = a + b;
cout << "The sum of your numbers is: " << sum << endl;
}

/* remember, its just a simple function and
does not check if your input is really a number
or not, if you leave empty or input anything
else than numbers you will get either error
messages or numbers that might be some address
*/

Answer 2

#include <iostream>
using namespace std;

int sum(int a, int b)
{
return a + b;
}

int main()
{
int a, b;
cout << "Enter 2 numbers: ";
cin >> a >> b;
cout << "Sum is " << sum(a, b);
return 0;
}