Random number on iOS

random_funcs.c

/* Return a random integer number between low and high inclusive */
int randomInt(int low, int high)
{
    return (arc4random() % (high-low+1)) + low;
}

/* Return a random BOOL value */
BOOL randomBool()
{
    return (BOOL)randomInt(0, 1);
}

/* Return a random float between 0.0 and 1.0 */
float randomClamp()
{
    return (float)(arc4random() % ((unsigned)RAND_MAX + 1)) / (float)((unsigned)RAND_MAX + 1);
}