如何在C中生成随机整数? [英] How to generate a random int in C?

问题描述

在C中是否有生成随机int数的函数?还是我必须使用第三方库?

Is there a function to generate a random int number in C? Or will I have to use a third party library?

推荐答案

注意:请勿使用rand()进行安全保护.如果您需要一个密码安全的号码，请查看此答案.

Note: Don't use rand() for security. If you need a cryptographically secure number, see this answer instead.

#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.

编辑:在Linux上，您可能更喜欢使用随机和随机.

Edit: On Linux, you might prefer to use random and srandom.

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