Problem with random number generation

This is a discussion on Problem with random number generation within the C Programming forums, part of the General Programming Boards category; Hello I wrote this program to generate 256 random numbers. The numbers change each time the code is excuted. But ...

  1. #1
    Registered User
    Join Date
    Sep 2005
    Posts
    92

    Problem with random number generation

    Hello

    I wrote this program to generate 256 random numbers. The numbers change each time the code is excuted. But I can't seem to limit the numbers from 1 to -1. Antother thing I can't seem to do is that I want the numbers to go up to 2 decimal placec. i.e. 1.11. I will be highly obliged if someone can point me inthe right direction.

    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <time.h>
    
    int main()
    {
    
        float i,a;
    
        /* Set evil seed (initial seed) */
        srand( (unsigned)time( NULL ) );
    
        for (i = 0; i < 256; i++) 
        {
            a=rand()/10000;	
            printf("%f\n",a);
        }
       
        return 0;
    }

  2. #2
    Just Lurking Dave_Sinkula's Avatar
    Join Date
    Oct 2002
    Posts
    5,006
    Code:
    a = rand() / (RAND_MAX / 2.0F) - 1;
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

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