To check divisibility of any large number by 9 in java

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If the sum of the digits of a number is divisible by 9, then the number is divisible by 9.

Some examples of numbers divisible by 9 are as follows.

•  The number 51984 is divisible by 9 because the sum of its digits (5+ 1 + 9 + 8 + 4 = 27) is divisible by 9.
• The number 91403 is not divisible by 9 because the sum of its digits (9 + 1 + 4 + 0 + 3 = 17) is not divisible by 9.

Program

import java.util.Scanner;

public class DivisibleBy9 {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter a number :");
String num = sc.nextLine();
int digitSum = 0;
for(int i = 0; i<num.length(); i++){
digitSum = digitSum + num.charAt(i)-'0';
}
if(digitSum % 9 == 0){
System.out.println("Given number is divisible by 9");
} else {
System.out.println("Given number is not divisible by 9");
}
}
}

Output

Enter a number :
51984
Given number is divisible by 9
Updated on 25-Jun-2020 12:01:29