C function pointer example

demo.c

#include <stdio.h>

typedef void (*thing_sayer)(char *person);

void say_hello(char *person) {
    printf("Hello, %s!\n", person);
}

void say_goodbye(char *person) {
    printf("Goodbye, %s!\n", person);
}

void say_something(thing_sayer say_thing, char *person) {
    say_thing(person);
}

int main() {
    char person[] = "Pete";
    say_something(say_hello, person);
    say_something(say_goodbye, person);
}