Hello everyone. I'm having a bit of a problem getting my probability program to work. It's supposed to determine the probability that 13 will be achieved with 3 dice rolls but every die gets the same value.

Here is the code:

Code:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int rand_int(int,int);
int a=1, b=6;
main()
{
int die[100], n=0, i, dietot=0, l;
double prob;
for(i=0;i<100;i++)
{
die[i]=rand_int(1,6);
printf("\nDie %d = %d",i+1,die[i]);
dietot=dietot+die[i];
if(dietot==13)n++;
l=i%3;
if(l==0)dietot=0;
}
prob=n/100;
printf("\nThe probability of throwing 3 dice and getting 13 is %lf out of 100",prob);
}
int rand_int(int a, int b)
{
srand(time(0)); //takes the current system time as a seed number
return (a + rand()%(b-a+1));
}

I'm really at a loss as to why this code won't work. My seed should give a different random number each time the loop calls rand_int but I just get 100 identical dice...

Any help would be greatly appreciated!