#include <iostream>
#include <cmath>
int main() {
int n = 8405961;
std::cout << "n: " << n << "\n";
int totaldigits_minusone = (int)log10(n);
int firstdigit = (int)(n / pow(10, totaldigits_minusone));
std::cout << "firstdigit: " << firstdigit << "\n";
int lastdigit = n % 10;
std::cout << "lastdigit: " << lastdigit << "\n";
return 0;
}
/*
run:
n: 8405961
firstdigit: 8
lastdigit: 1
*/