/* A random walk */
int x = 10;
int s = 0;
while ( x > 0 ) {
    int b = read() % 2; // randomness by user input
    if (b == 1) {
        x = x + 1;
    } else {
        x = x - 1;
    }
    s++;
}
write("I stopped walking after: ");
write(s);
write(" steps");
