//~#include <unistd.h>

//~int string_length (char * string) {
	//~int length = 0;
	//~while (* (string + length)) length++;
	//~return length;
//~}

//~void echo (char * string) {
	//~write (1, string, string_length (string));
//~}

//~int main (void) {
	//~echo ("Heyo world!\n");
	//~return (0);
//~}

extern int z;

extern int strlen (char * data) {
	int l = 0;
	while (* (data + l) != 0) l++;
	return l;
}

extern int add (int x, int y) {
	z = x + y;
	return x;
}

extern int zod (int x, int y) {
	return x % y;
}

extern int mod (int x, int y) {
	x = add (x, y);
	return x % y;
}