- 0以上N以下の乱数：
rand() % (N + 1) - M以上N以下の乱数：
rand() % (N - M + 1) + M - x以外の0以上N以下の整数：
(x + (rand() % N + 1)) % (N + 1) - 0以上1以下の実数：
(double)rand() / RAND_MAX - M以上N以下の実数：
(double)rand() / RAND_MAX * (N - M) + M
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