First you start off with your #includes.

Code:

#include <iostream>
#include <math.h>

Now after that, you add this.

Code:

using namespace std;

You always need that.
Now for the function(Main).

Code:

int main()
{
    int a, b, total;

a and b are going to be the numbers you want to be.
Now we add it.

Code:

cout << "Enter a number you want to add " << endl;
    cin >> a >> b;


Like again, a and b are the numbers you want. Now after that, here was we need to give us the answer.

Code:



total = a + b;
   
    cout << "The total sum is : " << total << endl; 
    system("PAUSE");
    return 0;
}


If I didn't explain good, feel free to pm me.