Programming Example

Define a class to accept values in integer array of size 10. Find sum of one digit number and sum of two digit numbers entered. Display them separately.

Example:
Input: a[ ] = {2, 12, 4, 9, 18, 25, 3, 32, 20, 1}
Output:
Sum of one digit numbers : 2 + 4 + 9 + 3 + 1 = 19
Sum of two digit numbers : 12 + 18 + 25 + 32 + 20 = 107

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Study this program carefully to understand the logic, output, and explanation in a structured way.

Information & Algorithm

Given Input:

Enter 10 numbers:
2 12 4 9 18 25 3 32 20 1

Expected Output:

Sum of one digit numbers = 19
Sum of two digit numbers = 107

Program Code

import java.util.Scanner;

public class RansariDigitSum {

    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        
        int oneSum = 0, twoSum = 0;
        int arr[] = new int[10];
        
        // Accept 10 numbers from the user
        System.out.println("Enter 10 numbers:");
        int l = arr.length;
        
        for (int i = 0; i < l; i++) {
            arr[i] = in.nextInt();  // Fill the array with user input
        }
        
        // Calculate the sum of one-digit and two-digit numbers
        for (int i = 0; i < l; i++) {
            if (arr[i] >= 0 && arr[i] < 10)  // Check for one-digit numbers
                oneSum += arr[i];
            else if (arr[i] >= 10 && arr[i] < 100)  // Check for two-digit numbers
                twoSum += arr[i];
        }
        
        // Display the results
        System.out.println("Sum of one digit numbers = " + oneSum);
        System.out.println("Sum of two digit numbers = " + twoSum);
    }
}

Output

Input:
Enter 10 numbers:
2 12 4 9 18 25 3 32 20 1

Output:
Sum of one digit numbers = 19
Sum of two digit numbers = 107

<h3><strong>Explanation:</strong></h3>
<ul class="list-group">
<li class="list-group-item"><strong>One-digit numbers</strong>: <code>2, 4, 9, 3, 1</code>
<ul class="list-group">
<li class="list-group-item">The sum: <code>2 + 4 + 9 + 3 + 1 = 19</code></li>
</ul>
</li>
<li class="list-group-item"><strong>Two-digit numbers</strong>: <code>12, 18, 25, 32, 20</code>
<ul class="list-group">
<li class="list-group-item">The sum: <code>12 + 18 + 25 + 32 + 20 = 107</code></li>
</ul>
</li>
</ul>

Explanation

Array Initialization: An integer array of size 10 is declared to store the values.
User Input: We ask the user to input 10 integers to populate the array.
Sum Calculation:
- We initialize two variables oneSum and twoSum to store the sums of one-digit and two-digit numbers, respectively.
- The program loops through each array element:
  - If the number is a one-digit number (i.e., it’s between 0 and 9), it is added to oneSum.
  - If the number is a two-digit number (i.e., it’s between 10 and 99), it is added to twoSum.
Display the Results: After the loop, the program prints out the sum of the one-digit numbers and the sum of the two-digit numbers.

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.