Pseudo Code for Sum of Digits using REPEAT-UNTIL Loop

Objective

To create a REPEAT-UNTIL loop that calculates the sum of the digits of a given number.

Variables

• number: The input number provided by the user.
• sum: A variable to hold the cumulative sum of the digits (initialized to 0).
• digit: A variable to hold the current digit being processed.

Pseudo Code

1. INPUT number 
2. SET sum = 0
3. REPEAT
    a. SET digit = number MOD 10   // Extract the last digit of the number
    b. SET sum = sum + digit        // Add the last digit to the sum
    c. SET number = number DIV 10    // Remove the last digit from the number
4. UNTIL number = 0                // Continue until there are no digits left
5. OUTPUT sum                      // Return the sum of the digits

Explanation

• The program starts by taking an integer input (number).
• It initializes sum to zero.
• The REPEAT loop continues to execute until the number is reduced to zero.
  • In each iteration, the last digit is extracted using the modulus operation (MOD).
  • This digit is then added to sum.
  • The last digit is then removed from number using the division operation (DIV).
• Once all digits are processed, the total sum is outputted.

Summary

This pseudo code outlines a clear and structured method to compute the sum of the digits in a number using a REPEAT-UNTIL loop, enhancing clarity and facilitating understanding during the software development process.