Examples, usage, help in C++ program

Applications Programming
1

I have written a C++ program to perform raytracing and would want to write some functions to help the user: examples, usage, help

I am wondering how this is done. Would I just put some functions in the main program?

2

How to do it depends on what you already have and what exactly you want to do.

You're vague on both, so it's difficult to help.

3

Here's an example of how you'd do it in C:

int main(int argc, char *argv[])
{
        int n;
        for(n=1; n<argc; n++)
        {
                if(strcmp(argv[n], "--help") == 0)
                {
                        print_help();
                        exit(0);
                }
        }
}
4

That's what I've done. My question is where to put the function print_help();

I do have a few functions and they are quite long. They involve
sending information to the user. I have now put them in another
file.

5

Wherever you like. You can put them in the same file, or not. Just make sure to have headers for them if you put them in a different file.