Python Functions

# ===== 1. Simple Function =====
def greet():
    print("Hello, World!")

greet()  # Call the function

# ===== 2. Function with Parameters =====
print(f"\n===== With Parameters =====")

def greet_person(name):
    print(f"Hello, {name}!")

greet_person("Kyaw Kyaw")
greet_person("Ma Ma")

# ===== 3. Function with Return Value =====
print(f"\n===== With Return =====")

def add(a, b):
    return a + b

result = add(5, 3)
print(f"5 + 3 = {result}")

# ===== 4. Function with Default Parameters =====
print(f"\n===== Default Parameters =====")

def greet_with_title(name, title="Mr."):
    print(f"Hello, {title} {name}")

greet_with_title("Aung")        # Uses default "Mr."
greet_with_title("Mya", "Dr.")  # Override with "Dr."

# ===== 5. Function with Multiple Return Values =====
print(f"\n===== Multiple Returns =====")

def calculate(x, y):
    sum_val = x + y
    diff_val = x - y
    return sum_val, diff_val

s, d = calculate(10, 3)
print(f"Sum: {s}, Difference: {d}")

# ===== 6. Function with Docstring =====
print(f"\n===== With Docstring =====")

def square(n):
    """
    Returns the square of a number.
    Args: n (int/float)
    Returns: n squared
    """
    return n ** 2

print(f"Square of 5: {square(5)}")
print(f"Docstring: {square.__doc__}")

# ===== 7. Recursive Function =====
print(f"\n===== Recursive Function =====")

def factorial(n):
    if n == 0 or n == 1:
        return 1
    else:
        return n * factorial(n - 1)

print(f"Factorial of 5: {factorial(5)}")