A simple program that let my college girlfriend "turn off the internet" on her roommate's computer.

nonet.c

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

void action   (void);
int validate (void);

int main (void){

	system ("cls");
	printf ("\n\n\n  ");

top1:

	switch (validate()){
		case -1:
			system ("cls");
			return (0);
			break;
		case 1:
			action();
			break;
		default:
			system ("cls");
			printf ("\n  WRONG!\n\n  ");
			goto top1;
	}

	return (0);
}



void action (void){
	char d;

	system("cls");
	printf ("\n  What is the will of God?");
top:

	d = 0;

	printf ("\n");
	printf ("\n    (1) Turn internet ON");
	printf ("\n    (2) Turn internet OFF");
	printf ("\n    (3) Quit");
	printf ("\n");
	printf ("\n  > ");
	scanf ("%d", &d);

	switch (d){
		case 1:
			system ("ipconfig /renew");
			system ("cls");
			printf ("\n  Internet ON!\n\n  ");
			system ("pause");
			system ("cls");
			break;

		case 2:
			system ("ipconfig /release");
			system ("cls");
			printf ("\n  Internet OFF!\n\n  ");
			system ("pause");
			system ("cls");
			break;

		case 3:
			system ("cls");
			break;

		default:
			system ("cls");
			printf ("\n  ERROR: %d not a choice!\a  ", d);
			goto top;
			break;

	}
}


/* Return 1 for good, 0 for bad, -1 for give up. */

int validate (void){

	int i = 0;
	char entry[20];

	printf ("Enter password or \"quit\":  ");


	while ((entry[i] = (char)getchar()) != '\n'){
		i++;
	}
	entry[i] = '\0';


	if (!strcmp ("penguin", entry))
		return (1);
	else if (!strcmp ("quit", entry))
		return (-1);
	else
		return (0);

}