user56690 - 2 years ago 140

Java Question

i have written the below code for getting a three digit armstrong number.

`public class test {`

public static void main(String args[]){

for (int i = 100; i <= 999; i++){

int firstDigit = (i / 100);

int secondDigit = (i % 100) / 10;

int thirdDigit = (i % 10);

if ((firstDigit * firstDigit * firstDigit) +

(secondDigit * secondDigit * secondDigit) +

(thirdDigit * thirdDigit * thirdDigit) == i) {

System.out.println("this is a armstriong number - "+i);

}

} } }

I am trying to get a ANY digit armstrong based on users input, but i am ending up writing too much loops and code.

Please help.

Thanks in advance.

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Answer Source

The following code check if the scanned number (on console) is a Armstrong number. I've tested it, it works fine.

**TEST IN CONSOLE**

```
import java.util.Scanner;
class ArmstrongNumber
{
public static void main(String args[])
{
int n, sum = 0, temp, remainder, digits = 0;
Scanner in = new Scanner(System.in);
System.out.println("Input a number to check if it is an Armstrong number");
n = in.nextInt();
temp = n;
// Count number of digits
while (temp != 0) {
digits++;
temp = temp/10;
}
temp = n;
while (temp != 0) {
remainder = temp%10;
sum = sum + power(remainder, digits);
temp = temp/10;
}
if (n == sum)
System.out.println(n + " is an Armstrong number.");
else
System.out.println(n + " is not an Armstrong number.");
}
static int power(int n, int r) {
int c, p = 1;
for (c = 1; c <= r; c++)
p = p*n;
return p;
}
}
```

**WITH A FUNCTION**

If you need to use it as a function, please try this. The `n`

param is the number you want to check. My function return true if it is an Armstrong number, else it returns false.

```
public boolean isArmstrongNumber(int n) {
int sum = 0, temp = n, remainder, digits = 0;
while (temp != 0) {
digits++;
temp = temp/10;
}
temp = n;
while (temp != 0) {
remainder = temp%10;
sum = sum + power(remainder, digits);
temp = temp/10;
}
if (n == sum) //Armstrong number
return true;
else //Not Armstrong number
return false;
}
```

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