Recursive function to add two positive numbers

 Algorithm (Step by Step):

1. Start
2. Define a recursive function add_positive_numbers(a, b)
3. Check if b is 0 (base case)
   • If true, return a
   • If false, proceed to recursive case
4. For recursive case, return add_positive_numbers(a + 1, b - 1)
5. Prompt the user to enter two positive numbers
6. Validate that both numbers are positive
7. Call add_positive_numbers with the input numbers
8. Display the result
9. End

Hello, dear reader! 👋

Thanks for visiting my blog! I’m a student just like you, sharing what I learn to help others with Python programming. I hope my posts are useful for your studies! 😊

If you find this post helpful, please leave a comment—even just a few emojis will make my day! 🐍✨ Your feedback keeps me motivated to create more content for everyone. 🚀

Happy programming!
— Abhin Krishna, S01, EB Department, MEC

Pseudocode:

FUNCTION add_positive_numbers(a: INTEGER, b: INTEGER) -> INTEGER
    IF b = 0 THEN
        RETURN a
    ELSE
        RETURN add_positive_numbers(a + 1, b - 1)
    END IF
END FUNCTION

ALGORITHM AddPositiveNumbers
    BEGIN
        INPUT num1, num2
        IF num1 < 0 OR num2 < 0 THEN
            DISPLAY "Both numbers must be positive."
        ELSE
            result ← add_positive_numbers(num1, num2)
            DISPLAY "The sum of ", num1, " and ", num2, " is ", result
        END IF
    END

Program:

# Recursive function to add two positive numbers
def add_positive_numbers(a, b):
    # Base case: if one of the numbers is zero
    if b == 0:
        return a
    # Recursive case: increment a and decrement b
    return add_positive_numbers(a + 1, b - 1)
# Input two positive numbers
num1 = int(input("Enter the first positive number: "))
num2 = int(input("Enter the second positive number: "))
# Ensure both numbers are positive
if num1 < 0 or num2 < 0:
    print("Both numbers must be positive.")
else:
    # Calculate the sum using recursion
    result = add_positive_numbers(num1, num2)
    # Print the result
    print(f"The sum of {num1} and {num2} is {result}")

Flowchart:

flowchart TD A([Start]) --> B[/Enter 2 positive numbers/] B --> C{Are both numbers positive?} C -->|No| D[/Display: Both numbers must be positive/] --> E([End]) C -->|Yes| F["Call add_positive_numbers(num1, num2)"] F --> G{Is b = 0?} G -->|Yes| H[Return a] G -->|No| I["Return add_positive_numbers(a + 1, b - 1)"] I --> G H --> J[Calculate final result] J --> K[/Display: The sum is result/] K --> E %% Styling style A fill:#f9f,stroke:#333,stroke-width:2px style E fill:#f9f,stroke:#333,stroke-width:2px style B fill:#90caf9,stroke:#333,stroke-width:2px style D fill:#90caf9,stroke:#333,stroke-width:2px style K fill:#90caf9,stroke:#333,stroke-width:2px style C fill:#ffd700,stroke:#333,stroke-width:2px style G fill:#ffd700,stroke:#333,stroke-width:2px style F fill:#a5d6a7,stroke:#333,stroke-width:2px style H fill:#a5d6a7,stroke:#333,stroke-width:2px style I fill:#a5d6a7,stroke:#333,stroke-width:2px style J fill:#a5d6a7,stroke:#333,stroke-width:2px

Important!
If you find any mistakes in my code or flowchart, please comment below this post. I will be happy to correct them and clear up any doubts you may have.