What is a function pointer in C?

#include <stdio.h>

int add(int a, int b) { return a + b; }
int sub(int a, int b) { return a - b; }

int calc(int (*op)(int, int), int x, int y) {
    return op(x, y);
}

int main(void) {
    printf("%d\n", calc(add, 10, 4));
    printf("%d\n", calc(sub, 10, 4));
    return 0;
}

Output:

The function calc() does not know which operation it will run. This idea is used for callbacks, menus and the compare function of qsort(). See Pointers and Functions.

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