COMP 1250 — Introduction to Programming

🐍 Interactive Python Program

Python 3 George Brown Polytechnic Spring 2025 Grade: A+

A menu-driven Python console application that demonstrates foundational programming concepts through an interactive, user-facing interface. The program greets the user by name and presents a persistent main menu with five options, each targeting a different core concept from the COMP 1250 curriculum — conditionals, loops, arithmetic, data types, and output formatting. The project was developed as a personal programming challenge to consolidate all topics covered in the course.

Key Features

🔄

Persistent Menu Loop

A while True loop keeps the program running until the user selects Exit, demonstrating infinite loop control.

🔢

Arithmetic Calculator

Accepts two numbers and an operator (+, −, ×, ÷), evaluates the expression using nested conditionals, and prints the result.

⚖️

Number Comparator

Compares two integer inputs and returns whether the first is greater, lesser, or equal — with an invalid-input guard.

🔁

While & For Loops

Demonstrates both loop types with predetermined and user-defined ranges, including countdown and increment logic.

✅

Input Validation

Handles invalid operator input and type conversions with int() casting, guarding against incorrect user entries.

👤

Personalised Greeting

Prompts for a username before entering the menu loop, demonstrating string input and concatenation.

Source Code

# Interactive Python Program — COMP 1250 | Rohail Bhatti

# Personalised greeting on launch
username = input("Enter your username: ")
print("Hello " + username + "!")

while True:
    print("\nWelcome to the main menu")
    print("1. Print Hello, World!")
    print("2. Work with conditionals")
    print("3. Work with loops")
    print("4. Work with data types")
    print("5. Exit")
    decision = int(input("Please choose from 1 to 5: "))

    if decision == 1:
        print("Hello World!")

    elif decision == 2:
        choice1 = input("Math expression or bigger number? ")
        if choice1.lower() == "math":
            number1 = int(input("Enter first number: "))
            number2 = int(input("Enter second number: "))
            operator = input("Select operator (+, -, *, /): ")
            if   operator == "+": print("Sum:",     number1 + number2)
            elif operator == "-": print("Diff:",    number2 - number1)
            elif operator == "*": print("Product:", number1 * number2)
            elif operator == "/": print("Quotient:",number1 / number2)
            else: print("Invalid operator")
        elif choice1.lower() == "bigger":
            num1 = int(input("Enter first number: "))
            num2 = int(input("Enter second number: "))
            if   num1 > num2: print("First number is greater")
            elif num1 < num2: print("First number is lesser")
            else:             print("Numbers are equal")

    elif decision == 3:
        choice2 = input("While or for loops? ")
        if choice2.lower() == "while":
            while_num = 10
            while while_num >= 2:
                while_num -= 1
                print(while_num)
        elif choice2.lower() == "for":
            for num in range(1, 11):
                print(num)

    elif decision == 5:
        print("Goodbye, " + username + "!")
        break

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