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# Check if a large number is divisibility by 15

• Difficulty Level : Easy
• Last Updated : 02 Mar, 2023

Given a very large number. Check its divisibility by 15.

Examples:

```Input: 31
Output: No

Input : num = "156457463274623847239840239
402394085458848462385346236
482374823647643742374523747
264723762374620"
Output: Yes
Given number is divisible by 15```

A number is divisible by 15 if it is divisible by 5 (if the last digit is 5 or 0), and it is divisible by 3 (if sum of digits is divisible by 3).
Here, used accumulate function to sum up all the numbers.

## C++

 `// CPP program to check if a large` `// number is divisible by 15` `#include `   `using` `namespace` `std;`   `// function to check if a large number` `// is divisible by 15` `bool` `isDivisible(string s)` `{` `    ``// length of string` `    ``int` `n = s.length();`   `    ``// check divisibility by 5` `    ``if` `(s[n - 1] != ``'5'` `and s[n - 1] != ``'0'``)` `        ``return` `false``;`   `    ``// Sum of digits` `    ``int` `sum = accumulate(begin(s), end(s), 0) - ``'0'` `* n;`   `    ``// if divisible by 3` `    ``return` `(sum % 3 == 0);` `}`   `// driver program` `int` `main()` `{` `    ``string s = ``"15645746327462384723984023940239"``;` `    ``isDivisible(s)? cout << ``"Yes\n"``: cout << ``"No\n"``;` `    ``string s1 = ``"15645746327462384723984023940235"``;` `    ``isDivisible(s1)? cout << ``"Yes\n"``: cout << ``"No\n"``;` `    ``return` `0;` `}`

## Java

 `// Java program to check if a large` `// number is divisible by 15` `import` `java.util.*;`   `class` `GFG` `{` `     `  `// function to check if a large ` `// number is divisible by 15` `public` `static` `boolean` `isDivisible(String S)` `{` `    ``// length of string` `    ``int` `n = S.length();` `    `  `    ``// check divisibility by 5` `    ``if` `(S.charAt(n - ``1``) != ``'5'` `&& ` `        ``S.charAt(n - ``1``) != ``'0'``)` `        ``return` `false``;` `        `  `    ``// Sum of digits` `    ``int` `sum = ``0``;` `    ``for``(``int` `i = ``0``; i < S.length(); i++)` `        ``sum += (``int``)S.charAt(i);` `        `  `        ``// if divisible by 3` `        ``if``(sum % ``3` `== ``0``)` `            ``return` `true``;` `        ``else` `            ``return` `false``;` `}` `    `  `// Driver code` `public` `static` `void` `main (String[] args)` `{` `    ``String S = ``"15645746327462384723984023940239"``;` `    ``if``(isDivisible(S) == ``true``)` `        ``System.out.println(``"Yes"``);` `    ``else` `        ``System.out.println(``"No"``);` `        `  `    ``String S1 = ``"15645746327462384723984023940235"``;` `    ``if``(isDivisible(S1) == ``true``)` `        ``System.out.println(``"Yes"``);` `    ``else` `        ``System.out.println(``"No"``);` `    ``}` `}` `        `  `// This code is contributed ` `// by Akanksha Rai(Abby_akku)`

## Python3

 `# Python3 program to check if ` `# a large number is ` `# divisible by 15`   `# to find sum` `def` `accumulate(s): ` `    ``acc ``=` `0``;` `    ``for` `i ``in` `range``(``len``(s)):` `        ``acc ``+``=` `ord``(s[i]) ``-` `48``;` `    ``return` `acc;`   `# function to check ` `# if a large number` `# is divisible by 15` `def` `isDivisible(s):` `    ``# length of string` `    ``n ``=` `len``(s);`   `    ``# check divisibility by 5` `    ``if` `(s[n ``-` `1``] !``=` `'5'` `and` `s[n ``-` `1``] !``=` `'0'``):` `        ``return` `False``;`   `    ``# Sum of digits` `    ``sum` `=` `accumulate(s);` `    `  `    ``# if divisible by 3` `    ``return` `(``sum` `%` `3` `=``=` `0``);`     `# Driver Code` `s ``=` `"15645746327462384723984023940239"``;` `if` `isDivisible(s):` `    ``print``(``"Yes"``); ` `else``:` `    ``print``(``"No"``);`   `s ``=` `"15645746327462384723984023940235"``;` `if` `isDivisible(s):` `    ``print``(``"Yes"``);` `else``:` `    ``print``(``"No"``);`   `# This code is contributed by mits`

## C#

 `// C# program to check if a large` `// number is divisible by 15` `using` `System;`   `class` `GFG` `{ ` `// function to check if a large ` `// number is divisible by 15` `public` `static` `bool` `isDivisible(String S)` `{` `    ``// length of string` `    ``int` `n = S.Length;` `    `  `    ``// check divisibility by 5` `    ``if` `(S[n - 1] != ``'5'` `&&` `        ``S[n - 1] != ``'0'``)` `        ``return` `false``;` `        `  `    ``// Sum of digits` `    ``int` `sum = 0;` `    ``for``(``int` `i = 0; i < S.Length; i++)` `        ``sum += (``int``)S[i];` `        `  `        ``// if divisible by 3` `        ``if``(sum % 3 == 0)` `            ``return` `true``;` `        ``else` `            ``return` `false``;` `}` `    `  `// Driver code` `public` `static` `void` `Main()` `{` `    ``String S = ``"15645746327462384723984023940239"``;` `    ``if``(isDivisible(S) == ``true``)` `        ``Console.WriteLine(``"Yes"``);` `    ``else` `        ``Console.WriteLine(``"No"``);` `        `  `    ``String S1 = ``"15645746327462384723984023940235"``;` `    ``if``(isDivisible(S1) == ``true``)` `        ``Console.WriteLine(``"Yes"``);` `    ``else` `        ``Console.WriteLine(``"No"``);` `    ``}` `}` `        `  `// This code is contributed ` `// by mits`

## PHP

 ``

## Javascript

 ``

Output

```No
Yes```

Time complexity: O(number of digits)
Auxiliary space: O(1)

Method 2: Checking given number is divisible by 15 or not by using the modulo division operator “%”.

## C++

 `#include ` `using` `namespace` `std;` `int` `main()` `{` `    ``//input` `    ``long` `long` `int` `n=31;` `     `  `     `  `    ``// finding given number is divisible by 15 or not` `    ``if` `(n % 15 == 0)` `    ``{` `        ``cout << ``"Yes"``;` `    ``}` `    ``else` `    ``{` `        ``cout << ``"No"``;` `    ``}` `   `  `    ``return` `0;` `}`   `// This code is contributed by satwik4409.`

## Java

 `/*package whatever //do not write package name here */`   `import` `java.io.*;`   `class` `GFG {` `  ``public` `static` `void` `main(String[] args)` `  ``{`   `    ``// input` `    ``long` `n = ``31``;`   `    `  `    ``// finding given number is` `    ``// divisible by 15 or not` `    ``if` `(n % ``15` `== ``0``) {` `      ``System.out.println(``"Yes"``);` `    ``}` `    ``else` `{` `      ``System.out.println(``"No"``);` `    ``}` `  ``}` `}`   `// This code is contributed by laxmigangarajula03.`

## Python3

 `# Python code ` `# To check whether the given number is divisible by 15 or not`   `#input ` `n``=``31` `# the above input can also be given as n=input() -> taking input from user` `# finding given number is divisible by 15 or not` `if` `int``(n)``%``15``=``=``0``:` `  ``print``(``"Yes"``) ` `else``: ` `  ``print``(``"No"``)`   `  ``# this code is contributed by gangarajula laxmi`

## C#

 `using` `System;` `public` `class` `GFG {`   `  ``static` `public` `void` `Main()` `  ``{`   `    ``// input` `    ``long` `n = 31;`   `    `  `    ``//finding given number is` `    ``// divisible by 15 or not` `    ``if` `(n % 15 == 0) {` `      ``Console.Write(``"Yes"``);` `    ``}` `    ``else` `{` `      ``Console.Write(``"No"``);` `    ``}` `  ``}` `}`   `// This code is contributed by laxmigangarajula03`

## Javascript

 ``

## PHP

 ``

Output

`No`

Time complexity: O(1) as it is doing constant operations
Auxiliary Space: O(1) as it is using constant space for variables

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