What is the implementation method of random numbers in C++?

2 years ago
Liam
1 minute

There are several common ways to implement random numbers in C++.

  1. Using the rand function from the C standard library:
#include <cstdlib> // 包含rand函数所在的头文件
#include <ctime> // 包含time函数所在的头文件

int main() {
   // 初始化随机数种子
   srand(time(NULL));
   
   // 生成随机数
   int randomNum = rand();
   
   return 0;
}
  1. Using the random number engine and distribution functions from the C++ standard library:
#include <random>

int main() {
   std::random_device rd; // 获取一个随机数种子
   std::mt19937 gen(rd()); // 使用随机数种子初始化随机数引擎
   std::uniform_int_distribution<> dis(1, 100); // 定义一个均匀分布的整数分布函数，范围是1到100
   
   int randomNum = dis(gen); // 生成随机数
   
   return 0;
}
  1. Utilize a third-party library, such as the Boost library’s random number generator.
#include <boost/random/mersenne_twister.hpp>
#include <boost/random/uniform_int_distribution.hpp>

int main() {
   boost::random::mt19937 gen; // 使用mt19937引擎
   boost::random::uniform_int_distribution<> dis(1, 100); // 定义一个均匀分布的整数分布函数，范围是1到100
   
   int randomNum = dis(gen); // 生成随机数
   
   return 0;
}

These methods can all be used to generate random numbers, the choice of which method to use depends on the specific needs and use cases.

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