# calculator.py
class Calculator: def __init__(self): self.history = []
def add(self, num1, num2):
"""Add two numbers"""
result = num1 + num2
self.history.append(f"{num1} + {num2} = {result}")
return result
def subtract(self, num1, num2):
"""Subtract two numbers"""
result = num1 - num2
self.history.append(f"{num1} - {num2} = {result}")
return result
def multiply(self, num1, num2):
"""Multiply two numbers"""
result = num1 * num2
self.history.append(f"{num1} * {num2} = {result}")
return result
def divide(self, num1, num2):
"""Divide two numbers"""
if num2 == 0:
raise ValueError("Cannot divide by zero!")
result = num1 / num2
self.history.append(f"{num1} / {num2} = {result}")
return result
def get_history(self):
"""Get the calculation history"""
return self.history
while True:
print("\nOptions:")
print("1. Add")
print("2. Subtract")
print("3. Multiply")
print("4. Divide")
print("5. Get History")
print("6. Quit")
choice = input("Choose an option: ")
if choice == "1":
num1 = float(input("Enter the first number: "))
num2 = float(input("Enter the second number: "))
print(f"Result: {calculator.add(num1, num2)}")
elif choice == "2":
num1 = float(input("Enter the first number: "))
num2 = float(input("Enter the second number: "))
print(f"Result: {calculator.subtract(num1, num2)}")
elif choice == "3":
num1 = float(input("Enter the first number: "))
num2 = float(input("Enter the second number: "))
print(f"Result: {calculator.multiply(num1, num2)}")
elif choice == "4":
num1 = float(input("Enter the first number: "))
num2 = float(input("Enter the second number: "))
try:
print(f"Result: {calculator.divide(num1, num2)}")
except ValueError as e:
print(e)
elif choice == "5":
print("\nCalculation History:")
for i, history in enumerate(calculator.get_history()):
print(f"{i+1}. {history}")
elif choice == "6":
break
else:
print("Invalid option. Please choose a valid option.")