我正在做一个书本练习,内容是编写一个生成伪随机数的程序.我从简单开始.
I'm doing a book exercise that says to write a program that generates psuedorandom numbers. I started off simple with.
#include "std_lib_facilities.h"
int randint()
{
int random = 0;
random = rand();
return random;
}
int main()
{
char input = 0;
cout << "Press any character and enter to generate a random number." << endl;
while (cin >> input)
cout << randint() << endl;
keep_window_open();
}
我注意到每次程序运行时,都会有相同的随机"输出.所以我研究了随机数生成器,并决定通过在 randint() 中首先包含它来尝试播种.
I noticed that each time the program was run, there would be the same "random" output. So I looked into random number generators and decided to try seeding by including this first in randint().
srand(5355);
它一遍又一遍地生成相同的数字(我现在觉得实现它很愚蠢.)
Which just generated the same number over and over (I feel stupid now for implementing it.)
所以我想我会很聪明并像这样实现种子.
So I thought I'd be clever and implement the seed like this.
srand(rand());
这基本上和程序最初所做的一样,但输出了一组不同的数字(这是有道理的,因为 rand() 生成的第一个数字总是 41.)
This basically just did the same as the program did in the first place but outputted a different set of numbers (which makes sense since the first number generated by rand() is always 41.)
我唯一能想到的让这更随机的是:
The only thing I could think of to make this more random is to:
我是不是脑子进水了,我现在应该停下来吗?选项 2 难以实施吗?还有其他想法吗?
Am I in over my head and should I stop now? Is option 2 difficult to implement? Any other ideas?
提前致谢.
选项 2 并不难,给你:
Option 2 isn't difficult, here you go:
srand(time(NULL));
你需要为 srand()
包含 stdlib.h
和为 time()
包含 time.h
代码>.
you'll need to include stdlib.h
for srand()
and time.h
for time()
.
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