Random number generation

This is a discussion on Random number generation within the C Programming forums, part of the General Programming Boards category; I am making a random number generator that will either make a 0 or a 1. To do this, I ...

  1. #1
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    Random number generation

    I am making a random number generator that will either make a 0 or a 1. To do this, I simply used the code:

    random = rand()%2; // generate a 0 or a 1



    How can I make this generate a 1 or 0 with a 50% probability?

    Any hints? Thanks

  2. #2
    ATH0 quzah's Avatar
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    Oct 2001
    Posts
    14,826
    You just did. There is a 50% chance that the number generated will be even or odd.

    Code:
    #include <stdio.h>
    #include <time.h>
    int main ( void )
    {
    	int x=0,y=0,z=0;
    	double d=0.0;
    	srand(time(0));
    	for( x = 0; x < 10000000; x++ ) if(rand()%2) y++; else z++;
    	printf("y = %d, z = %d, y %% == %f, z %% = %f",
    		y, z, (float)y/x, (float)z/x );
    	return 0;
    }
    It doesn't get much more balanced than that.

    Quzah.
    Last edited by quzah; 04-16-2002 at 06:52 PM.
    Hope is the first step on the road to disappointment.

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