Check if a large number is divisible by 20

• Difficulty Level : Easy
• Last Updated : 14 Apr, 2021

Given a number, the task is to check if number is divisible by 20. The input number may be large and it may not be possible to store long long int and it may be very large number then we use the string.
Examples:

Input : 7575680
Output : Yes

Input : 987985865687690
Output : No

A number is divisible by 20 if it is divisible by 5 and 4. We can check if a number is divisible by 4 by checking if last two digits are divisible by 4. We can check for divisibility by 5 by checking last digit. Also, if the last digit of a number is zero and the second last digit is a multiple of 2 then the number is divisible by 20.

C++

 // CPP program to check if a large number// is divisible by 20.#include using namespace std; bool divisibleBy20(string num){    // Get number with last two digits    int lastTwoDigits = stoi(num.substr(num.length() - 2,                            num.length() - 1));     // Check if the number formed by last two    // digits is divisible by 5 and 4.    return ((lastTwoDigits % 5 == 0) &&            (lastTwoDigits % 4 == 0));} int main(){    string num = "63284689320";    if (divisibleBy20(num))        cout << "Yes" << endl;    else        cout << "No" << endl;    return 0;}

Java

 // Java program to check if a large n// number is divisible by 20.import java.io.*; class GFG {         static Boolean divisibleBy20(String num)    {        // Get number with last two digits        int lastTwoDigits = Integer.parseInt(num.substring(num.length() - 2,                                                           num.length() ));                 // Check if the number formed by last two        // digits is divisible by 5 and 4.        return ((lastTwoDigits % 5 == 0) &&                (lastTwoDigits % 4 == 0));    }         // Driver Program    public static void main (String[] args)    {        String num = "63284689320";        if (divisibleBy20(num) == true)            System.out.println("Yes");        else            System.out.println("No");             }} // This code is contributed by Gitanjali.

Python3

 # Python3 program to check if a large# number is divisible by 20.import math def divisibleBy20(num):     # Get number with last two digits    lastTwoDigits = int(num[-2:])     # Check if the number formed by last two    # digits is divisible by 5 and 4.    return ((lastTwoDigits % 5 == 0 and             lastTwoDigits % 4 == 0)) # driver codenum = "63284689320"if (divisibleBy20(num) == True):    print("Yes")else:    print("No") # This code is contributed by Gitanjali.

C#

 // C# program to check if a large// 'n' number is divisible by 20.using System;using System.Text; class GFG{ static bool divisibleBy20(String num){    // Get number with last two digits    int lastTwoDigits = Int32.Parse(num.Substring(2));         // Check if the number formed    // by last two digits is    // divisible by 5 and 4.    return ((lastTwoDigits % 5 == 0) &&            (lastTwoDigits % 4 == 0));} // Driver Codestatic public void Main (){    String num = "63284689320";    if (divisibleBy20(num) == true)        Console.Write("Yes");    else        Console.Write("No");}} // This code is contributed by Raj



Javascript


Output:
Yes

My Personal Notes arrow_drop_up