Why does nRNum = rand () / RAND_MAX return zero?

小胖子

double nRNum;
srand ((unsigned) time (NULL));
nRNum = rand () / RAND_MAX;
return nRNum;

Why are the returned values ​​all zero, not random numbers uniformly distributed in the interval (0,1), how can I generate random numbers in the interval (0,1)?

darkpig

Both are int, and the division is naturally 0.


nRNum = rand () / (double) RAND_MAX; // Convert one of them

小胖子

Thank you so much, I just do n’t know if it is a (0, 1) interval pseudo-random number