#include<stdio.h>
#include<stdlib.h>

void run_thing(int (*f)(int)){
	printf("f(10) = %d\n", f(10));
	printf("f(29) = %d\n", f(29));
}

int square(int x){
	return x*x;
}

int add5(int x){
	return x+5;
}

// The lazy alternative that works just fine
//void* return_random(){
	
int (*return_random())(int){
	if(random() % 2)
		return square;
	return add5;
}

void main(){
	run_thing(square);
	run_thing(add5);

	printf("Let's run a random one!\n");
	run_thing(return_random());
	run_thing(return_random());
	run_thing(return_random());
	run_thing(return_random());
	run_thing(return_random());
	run_thing(return_random());
	run_thing(return_random());
	run_thing(return_random());
	run_thing(return_random());
	run_thing(return_random());
}