In c++, I want to create one real random variable(x) that is between zero and one (0<x<1), how can I do that?

Question

Hello,
In c++, I want to create one real random variable(x) that is between zero and one (0 Thank you
Best Regards

Answer 1

In c++ you can create a random number using random(n) function. But it only creates between 0 and n. For example if you want to create 3 digit real number x (0 x=(random(999)+1)/1000;
or if you want to create 6 digits real number then
x=(random(99999)+1)/1000000;
and so on...

That's all.
Good Luck...

Answer 2

From what I understand there is no way to get a true random number. The random functions have an ordered method to them, so inherently they will not produce a random number. But for all practical purposes the random function will work. The casino machine programmers are always struggling with getting the ultimate random number generator.

Answer 3

apparently the best random generator method up to date is the marsenne twister method. tried to look at it once, but it understanding it was beyond my capacity. That's beyond the scope of this question though. I'm pretty sure rand() would work. And if u use the time as ur seed, u'll likely have a relatively random number.

Answer 4

It depends upon the intended use and kind of random number you want. Are you looking for a uniform, gaussian, or some other distribution? The standard rand() and random() functions are generally sufficient for games but not for research (their quality as pseudo-random number generators is quite poor).

Do you really want the number to be in the range (0,1)? Most applications want the range [0,1) or [0,1].

Answer 5

The above answer produces nonsense for me.

You should call the function random(), or if your library doesn't have it, rand(). Don't forget to change the random seed each time you start your program, or you'll get the same random numbers over and over again.

Answer 6

Here is your link

http://www.google.co.uk/search?hl=en&q=c%2B%2B+create+one+real+random+variable%28x%29+that+is+between+zero+and+one&btnG=Search&meta=cr%3DcountryUK%7CcountryGB