Generating Random Number

[Subhash Pavuskar]

How to Generate random number without using function ? can anyone tell me the logic ..

[John Jai]

Without using a function method? Why you don't want to use Math.random()

[Mohamed Sanaulla]

Subhash Pavuskar wrote:How to Generate random number without using function ? can anyone tell me the logic ..

Did you have a look at Random Number Generation algorithms? You can use any one of them. They are just some mathematical formulations that you can implement in code.

And I think this has been asked before as well in the forum. May be SearchFirst would have helped?

[Subhash Pavuskar]

@John Jai : You are using function here and i am asking about without using function call.


@Mohamed Sanaulla : I searched and they people used function ,so if you found the problem solution for the same then please let me know.

[John Jai]

Subhash Pavuskar wrote:@John Jai : You are using function here and i am asking about without using function call.

Yes - I just wanted to know your purpose. And please refer functions as methods.

Subhash Pavuskar wrote:@Mohamed Sanaulla : I searched and they people used function ,so if you found the problem solution for the same then please let me know.

A search result - http://www.coderanch.com/t/522167/java/java/Create-Random-Number#2365442

[Harsha Smith]

Random Numbers between 0 and what?

[Subhash Pavuskar]

@Harsha Smith : it can be any range depend on user input.

[Harsha Smith]

Understand how it is done in java.util.Random

[fred rosenberger]

Without using ANY methods?

I'm not sure that's possible. How are you going to get the user input without using a method?

[Subhash Pavuskar]

@fred rosenberger : Yeah ... Even I am also not getting . this question is asked to my friend in an Interview .

[Campbell Ritchie]

If it’s an interview question, that changes everything You can remind them what the definition of a function is: for the same input, a function always generates the same result. A random number generator is different; it generates a different result each time. So it isn’t a function.
Math.random() is in fact a function; it does not actually generate random numbers, but numbers whose value is difficult to predict from their seed. You would have to take the java.util.Random class apart to find how it is done. The code is in the usual src.zip file.

[Campbell Ritchie]

A few minutes ago, I wrote:. . . A random number generator is different; it generates a different result each time. . . .

Imprecise!! A random number can be repeated. I once won £10 by guessing a coin. I stuck on “heads” every time and people said, “What about the law of averages?” There is no such thing as a law of averages, and I won the £10

[suresh krishan]

random number is between 0.0 to 1.0

[fred rosenberger]

suresh krishan wrote:random number is between 0.0 to 1.0

inclusive or exclusive?

[Campbell Ritchie]

fred rosenberger wrote: . . . inclusive or exclusive?

Semi-exclusive.

That shows how precise you have to be when you work with computers. The java.util.Random#nextDouble() documentation returns a number between 0.0 and 1.0, and it tells you whether it is inclusive or exclusive.