HW2_Laskina

HW2_Laskina/README.md

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+# 🧮 HW2 Team Calculator
+
+> A simple Python calculator that evaluates mathematical expressions in the format: `number operator number`.
+
+---
+
+## 📌 Description
+
+This repository contains a team-developed implementation of a basic calculator as part of a homework assignment.  
+The program accepts an expression via `input()`, for example:  
+
+`5 + 3`
+
+and prints the result of the calculation.
+
+Supported operations: `+`, `-`, `*`, `/`.
+
+Each mathematical operation is implemented in a separate function:  
+- `add(x, y)` — addition  
+- `sub(x, y)` — subtraction  
+- `mul(x, y)` — multiplication  
+- `div(x, y)` — division (with error handling for division by zero)  
+
+The main logic for parsing and routing the expression is handled in the `main()` function.
+
+## ⚠️ Input Errors
+
+The calculator validates your input and will show error messages in the following cases:
+
+- Missing spaces:  
+  `5+3` → Error: the expression must be in the format `<number> <operator> <number>`
+
+- Comma as decimal separator:  
+  `3,5 + 2` → Error: use a dot for the decimal part, not a comma.
+
+- Unsupported operator:  
+  `5 ^ 2` → Error: operator '^' is not supported. Available: +, -, *, /
+
+- Division by zero:  
+  `7 / 0` → Error: Division by zero is not allowed
+
+---
+
+## 👥 Development Team
+
+| Contributor         | Contribution                              |
+|---------------------|-------------------------------------------|
+| Natalia Laskina     | `main()` — main logic                     |
+| Daria Bobrova       | `add()` — addition                        |
+| Vadim Bolshakov     | `sub()` — subtraction                     |
+| Nikita Maksimov     | `mul()` — multiplication                  |
+| Artem Stetoi        | `div()` — division, `main()`, `parse_number()` |
+
+---
+
+## 🚀 How to Use
+
+### Requirements:
+- Python 3.6 or higher
+
+### Running the Program:
+
+1. Clone the repository (if not already done):
+   ```bash
+   git clone -b HW2_Laskina https://github.com/NataliaLaskina/HW2_NBLaskina.git
+
+2. Navigate to the project folder:
+   ```bash
+   cd HW2_NBLaskina
+3. Run the calculator:
+   ```bash
+   python HW2_Laskina/calculator.py
+4. Enter an expression in the format:
+   ```bash
+   <number> <operator> <number>
+
+   #Example: 10 - 4
+5. The program will output the result:
+   6
+
+📂 Project Structure
+
+- `HW2_NBLaskina/` — root folder
+  - `HW2_Laskina/` — main project folder
+    - `calculator.py` — main script with 6 functions:
+      - `add(x, y)`
+      - `sub(x, y)`
+      - `mul(x, y)`
+      - `div(x, y)`
+      - `parse_number(token)`
+      - `main()`
+  - `imgs/` — folder for project screenshots 
+  - `README.md` — this file
+
+✨ Completed as part of a course assignment. All team members contributed equally to the development.
+
+![Разработчики за работой](imgs/my-image.jpg)

HW2_Laskina/calculator.py

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+correct_oper = ["+", "-", "*", "/"]
+def div(x: float, y: float) -> float:
+    if y == 0:
+        raise ZeroDivisionError("Division by zero is not allowed")
+    return x / y
+
+def add(x: float, y: float) -> float:
+    return x + y
+
+def mul(x: float, y: float) -> float:
+    return x * y
+
+def sub(x: float, y: float) -> float:
+    return x - y
+
+def parse_number(token: str):
+    if "." in token or "e" in token.lower():
+        return float(token)
+    return int(token)
+def main():
+    while True:
+        calc = input("Enter an expression like: <number> <operator> <number>\n"
+                     "Example: 2.5 * 4 \n> ").strip()
+
+        if "," in calc:
+            print("Error: use a dot for the decimal part, not a comma.")
+            continue
+
+        parts = calc.split()
+        if len(parts) != 3:
+            print("Error: the expression must be in the format: <number> <operator> <number>")
+            continue
+
+        left, op, right = parts
+
+        if op not in correct_oper:
+            print(f"Error: operator '{op}' is not supported. Available: {', '.join(correct_oper)}")
+            continue
+
+        try:
+            x = parse_number(left)
+            y = parse_number(right)
+        except ValueError:
+            print("Error: invalid number. Use integers or real values.")
+            continue
+
+        try:
+            if op == "+":
+                res = add(x, y)
+            elif op == "-":
+                res = sub(x, y)
+            elif op == "*":
+                res = mul(x, y)
+            elif op == "/":
+                res = div(x, y)
+        except ZeroDivisionError as e:
+            print(f"Error: {e}")
+            continue
+
+        print("Result:", res)
+
+if __name__ == "__main__":
+    main()