[Solved] randomize numbers without any std- function

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I found similar question on stackoverflow : How do I generate random numbers without rand() function?

I make little modifications for generating between 0-35 and final solution:

#include<stdio.h>
#include<time.h>
int main()
{
    int num = 36;
    time_t sec;
    sec=time(NULL);
        for(;;)
        {
            sec=sec%3600;
            if(num>=sec)
            {
            printf("%ld\n",sec);
            break;
            }
            sec=sec%num;
        }
    return 0;
}

Here we are using <time.h>for time instead of <stdlib.h> for rand()
if we don’t want 0 as answer then we can add

while(sec==0)
{
    sec=time(NULL); 
}

before this statement : sec=sec%3600;

solved randomize numbers without any std- function