def greet(name="Guest"):
    """Greet user."""
    return f"Hello, {name}!"

print(greet())
print(greet("Raj"))

def greet(name="Guest", message="Hello"):
    """
    This function greets a person with a customizable message.
    'name' and 'message' are parameters with default arguments.
    """
    print(f"{message}, {name}!")

# Function calls with various argument combinations

# 1. Calling with no arguments (uses all default values)
print("--- Call 1: No arguments ---")
greet()

# 2. Calling with one argument (overrides 'name', uses default 'message')
print("\n--- Call 2: One argument (name) ---")
greet("Raj")

# 3. Calling with two arguments (overrides both 'name' and 'message')
print("\n--- Call 3: Two arguments ---")
greet("Anand", "Hi there")

# 4. Calling with keyword arguments (overrides 'message', uses default 'name')
print("\n--- Call 4: Keyword argument (message) ---")
greet(message="Good Morning")