Functions

A function has a return type, a name, and a list of parameters. Parameters in C are always passed by value — the function gets its own copy of each argument, so changes inside the function don't affect the caller's variable (passing a pointer, covered two lessons from now, is how you get around that).

main.c

Try it yourself →

#include <stdio.h>

int multiply(int a, int b) {
    return a * b;
}

int main() {
    printf("%d\n", multiply(6, 7));
    return 0;
}

Output

Next: arrays — C's fixed-size, no-bounds-checking collection type.

Practice exercise

Write a function multiply(int a, int b) that returns a * b, then print multiply(6, 7).

← Operators and Control Flow Arrays →