How do I return multiple values from a function in C?

Question

If I have a function that produces a result int and a result string, how do I return them both from a function?

As far as I can tell I can

Answer 1

Create a struct and set two values inside and return the struct variable.

struct result {
    int a;
    char *string;
}

You have to allocate space for the char * in your program.