Pseudo Code for a Simple Calculator

Overview

This pseudo code outlines the functionality of a simple calculator that can perform basic arithmetic operations: addition, subtraction, multiplication, and division. It prompts the user for input, processes the operation, and displays the result.

Main Components

1. Input Handling
2. Operation Selection
3. Calculation Logic
4. Output Result

Pseudo Code

BEGIN SimpleCalculator

    FUNCTION displayMenu()
        PRINT "Select operation:"
        PRINT "1. Addition"
        PRINT "2. Subtraction"
        PRINT "3. Multiplication"
        PRINT "4. Division"
        PRINT "5. Exit"
    END FUNCTION

    FUNCTION getInput()
        PRINT "Enter first number:"
        READ firstNumber
        PRINT "Enter second number:"
        READ secondNumber
        RETURN firstNumber, secondNumber
    END FUNCTION

    FUNCTION calculate(operation, num1, num2)
        IF operation = 1 THEN
            RETURN num1 + num2 // Addition
        ELSE IF operation = 2 THEN
            RETURN num1 - num2 // Subtraction
        ELSE IF operation = 3 THEN
            RETURN num1 * num2 // Multiplication
        ELSE IF operation = 4 THEN
            IF num2 = 0 THEN
                PRINT "Error: Division by zero is undefined."
                RETURN NULL
            ELSE
                RETURN num1 / num2 // Division
            END IF
        ELSE
            PRINT "Invalid operation selected."
            RETURN NULL
        END IF
    END FUNCTION

    // Main logic
    DECLARE exitProgram AS BOOLEAN
    SET exitProgram = FALSE

    WHILE NOT exitProgram DO
        CALL displayMenu()
        READ userChoice
        
        IF userChoice = 5 THEN
            SET exitProgram = TRUE
            PRINT "Exiting the calculator."
        ELSE
            firstNumber, secondNumber = CALL getInput()
            result = CALL calculate(userChoice, firstNumber, secondNumber)
            IF result IS NOT NULL THEN
                PRINT "Result:", result
            END IF
        END IF
    END WHILE

END SimpleCalculator

Explanation of the Components

• displayMenu(): Displays a list of operations for the user to choose from.
• getInput(): Prompts the user to enter two numbers and returns them as input.
• calculate(): Takes the chosen operation and two numbers, performs the operation, and handles division by zero errors.
• Main Logic: Manages the flow of the program, including displaying the menu, taking user input, performing calculations, and showing results.

Conclusion

This pseudo code serves as a foundation for implementing a simple calculator program. It can be easily translated into various programming languages by following the structured logic presented here.