⚙️ Functions

def greet(name):
    print(f"Namaste, {name}! 🙏")

greet("Rahul")   # Namaste, Rahul! 🙏
greet("Priya")   # Namaste, Priya! 🙏
greet("Amit")    # Namaste, Amit! 🙏

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

def calculator(n1, n2, op="+"):
    if   op=="+": return n1+n2
    elif op=="-": return n1-n2
    elif op=="*": return n1*n2
    else: return n1/n2 if n2 else "Error!"

print(add(5, 3))             # 8
print(calculator(10, 4, "*")) # 40

# Lambda — short function
square = lambda x: x**2
add    = lambda a,b: a+b
greet  = lambda name: f"Hi {name}!"

print(square(5))        # 25
print(add(3, 7))         # 10
print(greet("Rahul"))   # Hi Rahul!

# sorted mein lambda
students = [("Priya",92),("Rahul",78),("Amit",85)]
sorted_s  = sorted(students, key=lambda x: x[1], reverse=True)
print(sorted_s)

# Chapter 11: Functions — Advanced Practice
print("=== Functions Practice ===")

# Example 1: Basic usage
result = "Python mein Functions bahut powerful hai!"
print(result)

# Example 2: Real world use
data = ["Functions", "Python", "Hindi", "PythonHindi.in"]
for item in data:
    print(f"Item: {item}")

print("\nPractice complete! Great job! 🎉")

# Chapter 11: Functions — Advanced Examples
# Yeh code copy karo aur run karo!

# Example 1: Basic concept
print("=== Chapter 11: Functions ===")

# Example 2: List operations
items = ["Python", "Hindi", "Code", "Practice"]
for i, item in enumerate(items, 1):
    print(f"{i}. {item}")

# Example 3: Dictionary usage
chapter_info = {
    "number": 11,
    "title":  "Functions",
    "level":  "Intermediate",
    "done":   False
}
for key, value in chapter_info.items():
    print(f"  {key:10}: {value}")

# Example 4: Function
def practice_summary(chapter, completed=False):
    status = "Complete ✅" if completed else "In Progress ⏳"
    return f"Chapter {chapter}: {status}"

print(practice_summary(11))
print(practice_summary(11, True))