c - 如何在C中生成随机int？(How to generate a random int in C?)

Question

Is there a function to generate a random int number in C? (是否有在C中生成随机int数的函数？) Or will I have to use a third party library? (或者我必须使用第三方库吗？)

  ask by Kredns translate from so

Answer 1

Note : Don't use rand() for security. (注意 ：不要使用rand()来保证安全性。) If you need a cryptographically secure number, see this answer instead. (如果您需要加密安全号码， 请参阅此答案 。)

#include <time.h>
#include <stdlib.h>

srand(time(NULL));   // Initialization, should only be called once.
int r = rand();      // Returns a pseudo-random integer between 0 and RAND_MAX.

Edit : On Linux, you might prefer to use random and srandom . (编辑 ：在Linux上，您可能更喜欢使用random和srandom 。)