Problems
The first digit of the number
include <iostream>
include <cmath>
using namespace std; int main() {
long long n,i; cin>>n; n=abs(n); while(n>0){ i=n%10; n=n/10;} cout<<i;
}
include <iostream>
include <cmath>
using namespace std; int main() { long long n,i; cin>>n; n=abs(n); while(n>0) { i=n%10; n=n/10; } cout<<i; }