Get first two digits of a long long number

Question

Hello I have a long long number which varies from 13,15, and 16 digits in length. I want to get the first two digits(from the left) of these numbers. For example:

Enter Number = 1234567890123;
First 2 digits = 12
Enter Number = 453456789012345;
First 2 digits = 45
Enter Number = 3534567890123456;
First 2 digits = 35

Answer 1

Repeatedly divide by 10 until 0 is reached, remembering the antepenultimate value of the number, which you will eventually return as the result.

In other words,

#include <stdio.h>

int main(void) {
    long long n = 3534567890123456; 
    long long n1 = n, n2 = n; // n2 will hold the first two digits. 
    while (n){
        n2 = n1;
        n1 = n;
        n /= 10;
    }   
    printf("%lld", n2); 
}

I initialise n1 and n2 to n so the correct result is returned if the magnitude of n is less than 100.

Note that this algorithm carelessly considers an unnecessary step (you don't need to run n right down to 0) but doing so saves having to worry about negative n cases, and n1 also yields the first digit, which could be useful.