Java Program to Check Strontio Number

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In the previous article, we have discussed Java Program to Check Smith Number

In this article we are going to understand what Strontio number is and how we can check whether a number is Strontio or not in Java with examples.

Program to Check Strontio Number

Strontio numbers are numbers which when multiplied with 2, the ten’s and hundred’s digits are the same.

 Example :

1386: 1386*2=2772 Strontio number
1221: 1221*2=2442 Strontio number
1250: 1250*2=2500 Not a Strontio number

In the above examples the number 1386 and 1221 are Strontio numbers as the digits at its ten’s and hundred’s place when multiplied with 2 are equal. However 1250 is not a Strontio number as both the digits are different.

Let’s see different ways to check Strontio number.

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Approach :

  1. Enter/Declare a number and store it .
  2. Then we multiply it by 2 and find remainder when divided by 10 and 1000.
  3. If both the remainders are equal, then the number is said to be a Strontio number.

Method-1: Java Program to Check Strontio Number By Using Static Value

import java.util.Scanner;

public class StrontioNumber
{
    public static void main(String args[])
    {
        //A number declared
        int num = 1555;

        int prod = num*2, rem1, rem2;

        //Gives last 3 digits
        prod = prod%1000;
        //Now Removes the last digit
        prod /=10;
        //Now only 2 digits in the number.
        // Rem1 holds the 10's digit while rem2 holds the 100's digit
        rem1 = prod%10;
        rem2 = prod/10;

        if(rem1==rem2)
        {
            System.out.println(num+" is a Strontio number");
        }
        else
        {
            System.out.println(num+" is Not a Strontio number");
        }
    }
}

Output:

1555 is a Strontio number

Method-2: Java Program to Check Strontio Number By User Input Value

import java.util.Scanner;

public class StrontioNumber
{
    public static void main(String args[])
    {
        //Taking the number as input from the user using scanner class
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a number : ");
        int num = scan.nextInt();

        int prod = num*2, rem1, rem2;

        //Gives last 3 digits
        prod = prod%1000;
        //Now Removes the last digit
        prod /=10;
        //Now only 2 digits in the number.
        // Rem1 holds the 10's digit while rem2 holds the 100's digit
        rem1 = prod%10;
        rem2 = prod/10;

        if(rem1==rem2)
        {
            System.out.println(num+" is a Strontio number");
        }
        else
        {
            System.out.println(num+" is Not a Strontio number");
        }
    }
}

Output:

Case-1

Enter a number : 1386
1386 is a Strontio number

Case-2

Enter a number : 1551
1551 is a Strontio number

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