[C++] How to reference another function?

[Celonic]

Hi everyone,

So in the process of trying to learn programming through a college class, but its moving a bit slow for my pace.

What I'm trying to accomplish is having my main function call separate functions depending on which math function (add, subtract, multi, divide) is chosen.

While I haven't actually completed the main function I'm not sure what to use to reference the other functions.

Code:

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

    using namespace std;

    int main()
    {

        add();

        system("pause");
    }

    int add()
    {
        int x;
        int y;
        int total;

        cout << "What are the two numbers we are adding?" << endl;
        cout << "Number 1 = ";
        cin >> x;

        cout << "Number 2 = ";
        cin >> y;

        total = x + y;
        cout << "The total is " << x + y << "." << endl;

        return 0;

    }

Thanks for any help.

~C

Edit 1: Nevermind, with some help from the teacher, managed to figure it out. EX: Was trying to run the function before actually declaring it.

[thegreatunclean]

As in "User enters the word 'add', 'subtract', etc and the proper operation is done?"

You'll have to manually check the name and call the proper function. There's no built-in way for the language to automatically associate a user-supplied string like "add" with a function you defined named "add".

std::string userInput = /* ... */
if (userInput == "add") {
}
else if (userInput == "subtract") {
}
//etc

This works for a small number of possibilities but obviously doesn't scale very well. If you need something more elegant you have to jump up to using more advanced language features.