http://www.reddit.com/r/futurama/comments/18z3zj/was_working_through_my_c_textbook_decided_to_have/

theTest.c

#include <stdio.h>
#include <string.h>
#include <unistd.h>

void theTest();

int main() {
	printf("Be you robot? Or human?\n");

	char* passwd;
	scanf("%s", passwd);

	if (strcmp(passwd, "human") == 0) {
		for (;;) {
			printf("GET THE HUMANOID\n");
		}
	} else if (strcmp(passwd, "robot") == 0) {
		printf("\nADMINISTER THE TEST.\n");
		sleep(3);
		theTest();
	}

	return 0;
}

void theTest() {
	printf("\nWhich of the following would you most prefer?\n");
	printf("A) a puppy,\n");
	printf("B) a pretty flower,\n");
	printf("Or C), a large, properly formatted, data file?\n");

	char choice[1];
	scanf("%s", choice);

	if (strcmp(choice, "A") == 0) {
		for (;;) {
			printf("GET THE HUMANOID\n");
		}
	} else if (strcmp(choice, "B") == 0) {
		printf("\nAcceptable, you may enter.\n");
	} else if (strcmp(choice, "C") == 0) {
		printf("\nCorrect, you may enter.\n");
	}
}