How to check if a number is Harshad number in Java?
Harshad number is divisible by the sum of its digits. Simply put, if the sum of all the digits of a number is a factor of that number, then it is a Harshad number.
In this article, we will see how to check Harshad number using Java programming language.
Show you some examples
Example 1
Enter the number as 18
Let us check it using the logic of Harshad number −
The sum of the digits of the number = 1 8 = 9.
So, 18 is divisible by 9.
Therefore, 18 is a Harshad number.
Instance-2
is translated as:Instance-2
The number entered is 3
Let us check it using the logic of Harshad number −
The sum of the digits of the number = 3.
So, 3 can be divided by 3.
Therefore, 3 is the Harshad number.
The Chinese translation ofInstance-3
is:Instance-3
Enter the number as 15
Let us check it using the logic of Harshad number −
The sum of the digits of the number = 1 5 = 6.
So, 15 is not divisible by 6.
Therefore, 14 is not a Harshad number.
Some other examples of Harshad numbers include 1, 2, 4, 5, 6, 7, 8, 9, 10, 12, 18, 20, etc.
grammar
Convert an integer value to a string value using the built-in toString() method.
The following is the syntax to convert an integer value to a string value, then find its length and assign the length to an integer variable to get the total number of digits in the number -
String str = Integer.toString(input_number);
To get the length of an integer, we will use the built-in length() method of the Java String class Method returns the length of the String object.
int length = st.length();
To get the character at a specific position/index in a string, we use the charAt() method. Where charAt(i)-‘0’ returns the actual integer value.
int num = st.charAt(i)-‘0’;
Where "st" refers to the string, "i" is the iterator variable that iterates over the string.
algorithm
Algorithm 1
Step 1 - Get an integer via initialization or user input.
Step 2 - Find the sum of each digit of the number by iterating through each digit of the number.
Step 3 - Then check if the original number is divisible by the sum of all digits of the number. The given number is a Harshad number if it is divisible, otherwise it is not a Harshad number
Algorithm 2
Step 1 - Get an integer via initialization or user input.
Step 2 - Convert the integer to a string using the built-in toString() method.
Step 3 - Find the length of the string by using the built-in length() method.
Step 4 - Then by using a for loop, iterate until the length of the string and get an integer value 0' from the string using charAt(i)-' And record the sum of all numbers.
Step 5 - Then check if the original number is divisible by the sum of all digits of that number. The given number is a Harshad number if it is divisible, otherwise it is not a Harshad number.
Multiple methods
We provide solutions in different ways
Do not use strings
By using strings
Let’s look at the program and its output one by one.
Method 1: Not using strings
In this method, an integer value will be initialized in the program, and then by using Algorithm-1 we can check whether a number is a Harshad number.
Example
public class Main{ //main method public static void main(String args[]){ //Declared an integer variable and initialized a number as value int originalNumber = 21; //printing the given number to be checked System.out.println("Given number: "+originalNumber); //keep a copy of original number int copyOfOriginalNumber = originalNumber; //initialize sum as 0 int sum = 0; //Find sum of all digits of the number //continue the loop till the number is greater than 0 while(originalNumber > 0){ //get the rightmost digit of the number by using % operator int rem = originalNumber%10; //add the digit(rem) to sum sum = sum + rem; //remove the rightmost digit from number and get the updated number originalNumber = originalNumber/10; } //printing the result if(copyOfOriginalNumber % sum == 0) System.out.println(copyOfOriginalNumber+" is a Harshadnumber"); else System.out.println(copyOfOriginalNumber+" is not a Harshadnumber"); } }
Output
Given number: 21 21 is a Harshad number
Method 2: Using strings
In this method, an integer value will be initialized in the program and then using Algorithm-2 we will check whether the number is a Harshad number or not.
Example
public class Main{ //main method public static void main(String args[]){ //Declared an integer variable and initialized a number as value int originalNumber = 40; //printing the given number to be checked System.out.println("Given number: "+originalNumber); //keep a copy of original number int copyOfOriginalNumber = originalNumber; //initialize sum as 0 int sum = 0; //convert the integer to string by using toString() method String str = Integer.toString(originalNumber); //find length of String by using length() method //which is nothing but total number of digits in the given number int length=str.length(); //iterate the String and get the digits by using charAt(i)-'0' //find the sum of digits for(int i = 0; i < length; i++){ sum += str.charAt(i)-'0'; } //printing the result if(copyOfOriginalNumber % sum == 0) System.out.println(copyOfOriginalNumber+" is a Harshad number"); else System.out.println(copyOfOriginalNumber+" is not a Harshad number"); } }
Output
Given number: 40 40 is a Harshad number
In this article, we explored how to check if a number is a Harshad number in Java using different methods.
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