# Example of a basic calculator
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 x / y
    else:
        return "Cannot divide by zero."

# Test the calculator
num1 = 10
num2 = 5

print("Sum:", add(num1, num2))  # Output: Sum: 15
print("Difference:", subtract(num1, num2))  # Output: Difference: 5
print("Product:", multiply(num1, num2))  # Output: Product: 50
print("Quotient:", divide(num1, num2))  # Output: Quotient: 2.0