Random Numbers in Linux

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#include <stdio.h>
#include <string.h>
#include
<stddef.h>
#include <stdlib.h>
#include
<time.h>
#include "head.h"
 
#define RANG 3600.0
 
int main()
{
        int x, i, count;
        long long sum1=0,
sum2=0;
        int E, D;
        srand((unsigned)time(NULL));   // Éú³Éseed
       
E = (RANG-0)/2;
        D = (RANG-0)*(RANG-0)/12;
        printf("The
Expectation is %d\n", E);
        printf("The Variation is   %d\n",
D);
 
        count = 1000*10000;
        for(i=0; i<=count;
i++)
        {
                //printf("%d\n",  (int) (3600.0 * (rand() /
(RAND_MAX + 1.0))) ) ;
                x = (int) (3600.0 * (rand() /
(RAND_MAX + 1.0))); // Éú³ÉËæ»úÊý
                sum1 += x;
                sum2 +=
(x-E)*(x-E);
        }
 
        printf("Sampling Expectation is %d\n", sum1/count);
       
printf("Sampling Variation is   %d\n", sum2/count);
 
        return 0;
}
 
The test r