def add(x, y):
    return x + y
 
def subtract(x, y):
    return x - y
 
def multiply(x, y):
    return x * y
 
def divide(x, y):
    if y == 0:
        return "Error: Division by zero is not allowed"
    else:
        return x / y
 
print("Simple Calculator")
print("1. Addition")
print("2. Subtraction")
print("3. Multiplication")
print("4. Division")
 
choice = input("Enter your choice (1-4): ")
 
if choice in ['1', '2', '3', '4']:
    num1 = float(input("Enter first number: "))
    num2

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

Q2FsY3VsYXRlcg==

Calculater