11 Random Number

#include <stdio.h>
#include <math.h>
int main()
{
    int n,itr;
    printf("Enter any four digit number\n");
    scanf("%d",&n);

    printf("\nEnter number of iteration you want to perform\n");
    scanf("%d",&itr);


    long int sqr=n,digit,first_two,first;
    for(int i=1 ; i<=itr; i++)
    {
        sqr *= sqr ;
        printf("\n%d iteration Square is %ld ",i,sqr);
        digit = log10(sqr) +1;
        if(digit == 8){
            first_two = sqr / 1000000;
            sqr /= 100;
            sqr -= (first_two * 10000);
        }
        else{
            first = sqr / 1000000;
            sqr /=100;
            sqr -= (first * 10000);
        }

        printf("random value extracted is %ld",sqr);
    }

    return 0;
}