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Why are function pointers useful?

#include <string.h> #include <stdlib.h> #include <stdio.h> #include <time.h> int sum(int x, int y) { return x + y; } int prod(int x, int y) { return x * y; } void shouldNotBeChanged(int (*operation)(int, int)) { srand(time(NULL)); int a = rand() % 100; int b = rand() % 100; printf("The result of the operation between %d and %d is %d\n", a, b, operation(a, b)); } int main(int argc, char* argv[]) { shouldNotBeChanged(&prod); return 0; }