# The while loop in Python is used to repeat a block of code as long as a condition is True.
# It’s great when you don’t know ahead of time how many times you need to repeat something.

# 4 steps
i = 1 # initialization
while i <= 7: # condition check
    print(i, end = " ") # body of the loop; end is for not adding a new line
    i += 1 # incrementation

# decreasing while loop
i = 7
while i > 0:
  print(i, end = " ")
  i -= 1

i = 1
while i < 11:
  if i == 10: # not to add -- after 10
     print(i)
  else:
    print(i, end = "--")
  i += 1

# Common Mistake: Infinite Loop
while True:
    print("♾️") # If the condition never becomes False, the loop will run forever

# while with break
i = 1
while i <= 10:
    print(i)
    if i == 5:
        break  # exits the loop
    i += 1

# while with else - while else suite
x = 1
while x < 4:
    print(x)
    x += 1
else:
    print("Loop finished!")

# continue in a while loop
i = 0
while i < 10:
    i += 1
    if i % 3 == 0:
        continue  # skip the iteration when i is a multiple of 3
    print(i, end= " ")

# Using input() to control the loop
while True:
    name = input("Enter your name (or type 'exit'): ")
    if name == 'exit':
        break
    print(f"Hello, {name}!")
else:
  print("Not executed") # when the break statement gets executed; this else is skipped
print("Out of loop")

# Simulating countdowns or timers
import time

count = 7
while count > 0:
    print(f"Countdown: {count}")
    time.sleep(1)  # pauses for 1 second
    count -= 1
print("Hip Hip Hurray!")

# Waiting for a condition to be met
password = ""
while password != "python123":
    password = input("Enter password: ")
print("Access granted!")

# Useful in games, simulations, or retry logic
secret = 7
guess = 0
while guess != secret:
    guess = int(input("Guess the number: "))
print("You guessed it!")

# Number Guessing Game

import random

secret_number = random.randint(1, 10)
attempts = 0
max_attempts = 3

print("Welcome to the Number Guessing Game!")
print("Guess a number between 1 and 10.")
print(f"You have only {max_attempts} chances!")

while attempts < max_attempts:
    guess = int(input("\nYour guess: "))
    attempts += 1

    if guess == secret_number:
        print("🎉 Correct! You guessed the number.")
        break
    elif guess < secret_number:
        print("Too low!")
    else:
        print("Too high!")

    if attempts < max_attempts:
        print(f"You have {max_attempts - attempts} tries left.")
    else:
        print(f"\n😢 Out of chances! The correct number was {secret_number}.")


# Billing - Super Market
print("Express Counter at the Supermarket...")
name = input("Enter the name: ")
address = input("Enter the address: ")
ch = int(input("Are you sure that you have items less than or equal to 10? Type 1 for Yes or 2 for No: "))

if ch == 1:
    ctr = 0
    total_price = 0
    item_id = 1
    while ctr <= 10:
        print(f"\nEnter the price of item {item_id}")

        price = float(input("₹ "))

        if price <= 0:
            print("Invalid price. Please enter a valid price.")
            continue  # Skip to the next iteration without incrementing ctr

        total_price += price
        item_id += 1
        ctr += 1  # Only increment ctr and item_id if the price is valid
        print(f"Your bill so far for {ctr} items is ₹ {total_price}.")

        choice = input("\nEnter 'q' to quit or press 'Enter' to continue..")
        if choice == 'q':
            break

    print("\n----- BILL -----")
    print(f"Customer Name: {name}")
    print(f"Customer Address: {address}")
    print(f"\nYou have purchased {ctr} item(s).")
    print(f"Total Bill: ₹ {total_price:.2f}")
    print("------------------")

else:
    print("Please check the other counter.")