Message-ID: <01BBDE40.57785E00@sky38.dataplusnet.com>
From: Michael Matczynski <michaelm AT dataplusnet DOT com>
To: "'DJGPP mailing list'" <djgpp AT delorie DOT com>
Subject: Re: random #'s
Date: Fri, 29 Nov 1996 21:57:39 -0600
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I wrote this program and it proves that it is an accurate random number generator.

<<<START RANDOM.C>>>

#include <stdio.h>
#include <stdlib.h>	/* for random() */
#include <time.h>	/* for time() */
#include <ctype.h>	/* for tolower() */

int main( void )
{
    int r,x,y,number_one,number_two,number_three,number_four,number_five;
    number_one = number_two = number_three = number_four = number_five = 0;
    x=0;
    /* seed RNG with clock value - otherwise random() will always
       return the same sequence */

    srandom( (int) time( 0 ) );

    printf( "Type a 'q' to move on to the next example, or press Enter to continue." );

    while ( tolower( getchar( ) ) != 'q' )
    {
        r = random( ) % 501;	   /* 0 to 500 */
        printf( "The random number is: %d", r );
    }
    printf("Hold on, this may take a little while (10 seconds on my Pentium 100) . \n");
    
    do{
	y = random( ) % 501;
	if((y >= 0) && (y < 100))
		number_one++;
	if((y >= 100) && (y < 200))
		number_two++;
	if((y >= 200) && (y < 300))
		number_three++;
	if((y >= 300) && (y < 400))
		number_four++;
	if((y >= 400) && (y < 500))
		number_five++;
	x++;
    }
    while(x<10000000);

    printf("  0 to 100 = %d \n",number_one);
    printf("100 to 200 = %d \n",number_two);
    printf("200 to 300 = %d \n",number_three);
    printf("300 to 400 = %d \n",number_four);
    printf("400 to 500 = %d \n",number_five);


    return 0;
}

<<<END RANDOM.C>>>