How To Check Whether a Number is a Spy Number or Not in Java?

Java Server Side Programming Programming

A number is said to be a Spy number, if the sum of the digits of the given number is equal to the product of the digits of the given number.

For more clarification, we have to first calculate the sum of the digits of the given number. After that we have to calculate the product of the digits of the given number. Then we have to compare both the sum value and product value, if they are the same then the given number is a spy number otherwise it is not a spy number.

In this article, we will see how to check if a number is a Spy number by using Java programming language.

To show you some instances

Instance-1

Input number is 123.

Let’s check it by using the logic of Spy number.

The sum of the digits of 123 = 1 + 2 + 3 = 6
The product of the digits of 123 = 1 * 2 * 3 = 6

As we notice here both the sum value and product value are the same.

Hence, 123 is a Spy number.

Instance-2

Input number is 22.

Let’s check it by using the logic of Spy number.

The sum of the digits of 22 = 2 + 2 = 4
The product of the digits of 22 = 2 * 2 = 4

As we notice here both the sum value and product value are the same.

Hence, 22 is a Spy number.

Instance-3

Input number is 234.

Let’s check it by using the logic of Spy number.

The sum of the digits of 234 = 2 + 3 + 4 = 9
The product of the digits of 234 = 2 * 3 * 4 = 24

As we notice here both the sum value and product value are not same.

Hence, 234 is not a Spy number.

Algorithm

Step 1 − Get an integer number either by initialization or by user input.
Step 2 − Then take a loop and using the loop extract the digits and calculate sum value and product value.
Step 3 − Finally, when the loop ends you have the total sum value and product value.
Step 4 − If both the sum value and the product value are equal to each other then we can print the result as the given number is a spy number otherwise the number is not a spy number.

Multiple Approaches

We have provided the solution in 2 different approaches.

By Using Static Input Value
By Using User Defined Method

Let’s see the program along with its output one by one.

Approach-1: By Using Static Input Value

In this approach one integer value will be initialized in the program and then by using the algorithm we can check whether a number is a spy number or not.

Example


public class Main {
   public static void main(String args[]) {
      //declare the variables

      int inputNumber,org, productValue=1, sumValue=0, digit;
      //initialize the value to the variable

      inputNumber=123;
      //store that value to another variable for result print
      org=inputNumber;

      //continue the loop till the number is not zero
      while(inputNumber>0) {

         //extracting the unit place's digit
         digit=inputNumber%10;

         //continuously add that digit to sum variable
         sumValue=sumValue+digit;

         //continuously multiply the digit to the product variable
         productValue=productValue*digit;

         //removes that digit from the inputNumber
         inputNumber=inputNumber/10;
      }

      //check the condition
      //whether the sum value is equal to product value or not
      if(sumValue==productValue)

         //prints if the condition returns true
         System.out.println(org + " is a spy number.");
      else
         //prints if the condition returns false
         System.out.println(org + " is not a spy number.");
   }

}

Output

123 is a spy number.

Approach-2: By Using User Defined Method

In this approach, an integer value will be initialized in the program and then we will call a user defined method by passing this input number as parameter.

Inside the method we will check whether a number is a disarium number or not by using the algorithm.

Example


public class Main {
   //main method
   public static void main(String args[]) {

      //declare an int variable and initialize number as value
      int inp = 123;

      //call the method and return the value to the if condition
      if(checkSpy(inp))
         System.out.println(inp + " is a spy number.");
      else
         System.out.println(inp + " is not a spy number.");
   }

   //user defined method to check spy number
   public static boolean checkSpy(int inputNumber) {

      //declare the variables
      int productValue=1, sumValue=0, digit;

      //continue the loop till the number is not zero
      while(inputNumber>0) {

         //extracting the unit place's digit
         digit=inputNumber%10;

         //continuously add that digit to sum variable
         sumValue=sumValue+digit;

         //continuously multiply the digit to the product variable
         productValue=productValue*digit;

         //removes that digit from the inputNumber
         inputNumber=inputNumber/10;
      }
      //check the condition
      //whether the sum value is equal to product value or not
      if(sumValue==productValue)
         return true;
      else
         return false;
   }

}

Output

123 is a spy number.

In this article, we explored how to check a number whether it is a spy number or not in Java by using three different approaches.

Mr. Satyabrata

Updated on: 17-Nov-2022

1K+ Views

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