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        如何在 C++ 中创建一个随机的字母数字字符串?

        How do I create a random alpha-numeric string in C++?(如何在 C++ 中创建一个随机的字母数字字符串?)

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                  本文介绍了如何在 C++ 中创建一个随机的字母数字字符串?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我想创建一个随机字符串,由字母数字字符组成.我希望能够指定字符串的长度.

                  I'd like to create a random string, consisting of alpha-numeric characters. I want to be able to be specify the length of the string.

                  我如何在 C++ 中做到这一点?

                  How do I do this in C++?

                  推荐答案

                  Mehrdad Afshari 的 answer 可以解决问题,但我发现它对于这个简单的任务来说有点过于冗长.查找表有时可以创造奇迹:

                  Mehrdad Afshari's answer would do the trick, but I found it a bit too verbose for this simple task. Look-up tables can sometimes do wonders:

                  #include <ctime>
                  #include <iostream>
                  #include <unistd.h>
                  
                  std::string gen_random(const int len) {
                      static const char alphanum[] =
                          "0123456789"
                          "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                          "abcdefghijklmnopqrstuvwxyz";
                      std::string tmp_s;
                      tmp_s.reserve(len);
                  
                      for (int i = 0; i < len; ++i) {
                          tmp_s += alphanum[rand() % (sizeof(alphanum) - 1)];
                      }
                      
                      return tmp_s;
                  }
                  
                  int main(int argc, char *argv[]) {
                      srand((unsigned)time(NULL) * getpid());     
                      std::cout << gen_random(12) << "
                  ";        
                      return 0;
                  }
                  

                  请注意,rand 生成质量较差的随机数.

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