12-global.cminus

int seed;

int randomLCG(void) {
    seed = seed * 1103515245 + 12345;
    return seed;
}

int randBin(void) {
    if (randomLCG() > 0)
        return 1;
    else
        return 0;
}

/* random walk */
int returnToZeroSteps(void) {
    int x;
    int steps;

    x = 0;
    steps = 0;

    while (steps < 20) {
        if (randBin())
            x = x + 1;
        else
            x = x - 1;

        steps = steps + 1;
        if (x == 0)
            return steps;
    }
    return 20;
}

int main(void) {
    int i;
    i = 0;

    seed = 3407;

    while (i < 20) {
        output(returnToZeroSteps());
        i = i + 1;
    }
    return 0;
}