🚀 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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💻 Practical Program

📘 Step Learning

Learn this program step-by-step with algorithm, source code, output and detailed explanation.

📌 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);
    }
}

🖥 Program 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 example

First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.

🔥 Practice suggestion

Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.

⚡ Quick Practice Flow

Follow this learning sequence for better understanding.

Read the topic carefully
Understand the algorithm
Study the code line-by-line
Check the output result
Practice by modifying logic