Check if a large number is divisible by 5 or not in C++

Here we will see how to check a number is divisible by 5 or not. In this case the number is very large number. So we put the number as string.

To check whether a number is divisible by 5, So to check divisibility by 5, we have to see the last number is 0 or 5.

Example

#include <bits/stdc++.h>
using namespace std;
bool isDiv5(string num){
   int n = num.length();
   if(num[n - 1] != '5' && num[n - 1] != '0')
   return false;
   return true;
}
int main() {
   string num = "154484585745184258458158245285265";
   if(isDiv5(num)){
      cout << "Divisible";
   }else{
      cout << "Not Divisible";
   }
}

Output

Divisible