C ++创建一个介于0.1和10之间的随机小数 [英] c++ create a random decimal between 0.1 and 10

问题描述

我该怎么做?

这是我这样做的尝试:

srand (time(NULL));
seed = ((double)rand()) / ((double)RAND_MAX) * 10 + 0.5;

在0到某个int x之间创建随机 integer 的方法又是什么. [0，x]

Also what is the way of creating a random integer between 0 and some int x. [0,x]

推荐答案

C ++ 11方式:

The C++11 way:

#include <random>

std::random_device rd;
std::default_random_engine generator(rd()); // rd() provides a random seed
std::uniform_real_distribution<double> distribution(0.1,10);

double number = distribution(generator);

如果只需要整数，请改用以下分布:

If you only want integers, use this distribution instead:

std::uniform_int_distribution<int> distribution(0, x);

在这方面，C ++ 11确实功能强大且设计合理.生成器与分发的选择是分开的，要考虑范围，线程安全，性能好，人们花费大量时间来确保它们都是正确的.最后一部分比您想象的要难解决.

C++11 is really powerful and well-designed in this respect. The generators are separate from the choice of distribution, ranges are taken into account, thread safe, performance is good, and people spent a lot of time to make sure it's all correct. That last part is harder to get right than you think.

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