Check Armstrong number
About Armstrong Number
Definition for Armstrong number:
An Armstrong number is a sum of ‘nth’ power of each digit. ‘n’th digit is equal to n digit of a number.
153 = 111 + 555 + 333 — 153 is an Armstrong number
371 = 333 + 777 + 111 — 371 is an Armstrong number
Logic to implemented in program:
- Get input from keyboard
- Get total number of digit in given input digit
- Save input in temp variable for comparison purpose
- Find the sum of ‘nth’ power of each digit. here n is number of digit in given input number
- Display the output
1. Check Armstrong number without scanner class
import java.util.Scanner;
public class ArmstrongNo {
public static void main(String[] args) {
int inputvalue= 371; // Given number
int temp = inputvalue, finalresult=0, rem=0,count =0;
//Get total number of digit of given number
while(0<inputvalue){
inputvalue = inputvalue/10;
count ++;
}
//Restore given data to same variable
inputvalue = temp;
//Find the sum of 'nth' power of each digit. here 'n' is number of digit in given input number.
while(0<inputvalue){
rem = inputvalue%10;
inputvalue = inputvalue/10;
finalresult = finalresult + (int) Math.pow(rem, count);
}
//Display the output
if(finalresult==temp){
System.out.println("Number *"+temp+"* is Armstrong");
}else{
System.out.println("Number *"+temp+"* is Not Armstrong");
}
}
}
Output:
Number *371* is armstrong2. Check Armstrong number with scanner class
import java.util.Scanner;
public class ArmtrongNumber {
public static void main(String[] args) {
//Create object for Scanner class to get input digit from keyboard
Scanner scn = new Scanner(System.in);
//Get input digit from keyboard
System.out.print("Enter number : ");
int inputvalue = scn.nextInt();
int temp = inputvalue, finalresult=0, rem=0,count =0;
//Get total number of digit of given number
while(0<inputvalue){
inputvalue = inputvalue/10;
count ++;
}
//Restore given data to same variable
inputvalue = temp;
//Find the sum of 'nth' power of each digit. here 'n' is number of digit in given input number.
while(0<inputvalue){
rem = inputvalue%10;
inputvalue = inputvalue/10;
finalresult = finalresult + (int) Math.pow(rem, count);
}
//Display the output
if(finalresult==temp){
System.out.println("Number *"+temp+"* is Amstrong");
}else{
System.out.println("Number *"+temp+"* is Not Amstrong");
}
}
}
Output 1:
Enter number : 123
Number *123* is Not Amstrong
Output 2:
Enter number : 371
Number *371* is AmstrongRecommended article:
- Introduction to java
- How to install java
- Add two matrix multidimensional array in java
- Check given number Prime or Not
- Sort an array in ascending, descending order in java
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