# lecture 3, conditional statements!
print("Welcome!")

# NEW FILE

from decimal import Decimal

# this is a somewhat tedious feature of the float data type
number1 = float(0.1)
number2 = float(0.2)
print(f"Normal float/decimal numbers: {number1} + {number2} =")
print(number1 + number2)

# 0.1 is a problematic float value, or pretty much all values that are between 0 and 0.1
# this happens because of the method how computers handle floating numbers
# basically this is a problem in each programming languages, however, some programming languages "take care of this"
# automatically for the programmer

# easy fix usually: round the value
total = number1 + number2
total = round(total, 1)
print(total)

# one way is to use the decimal-module in Python
# note: remember to import decimal
number3 = Decimal("0.1")
number4 = Decimal("0.2")
print(f"Decimal numbers of the decimal-module: {number3} + {number4} =")
print(number3 + number4)

# NEW FILE

# user's age
age = 19

# conditional statement -> is age under 20?
# if it is -> run the print-code below
if age < 20:
    print("You are less than 20 years old.")
    print("This is also only run if the condition is true.")

print("This is run regardless of the if-statement, since it has no indentation.")

# NEW FILE

# ask user's age (integer)
age = input("How old are you?\n")
age = int(age)

# is the user less than 20 years old?
# if yes => print "You're less than 20 years old."
# if not => go to the else -statement
if age < 20:
    print("You're less than 20 years old.")
else:
    print("You're at least 20 years old.")

print("Thank you for using the application!")

# NEW FILE

# ask user's age (integer)
age = input("How old are you?\n")
age = int(age)

# is the user less than 20 years old?
# if yes => print "You're less than 20 years old."
# if not => go to the else -statement
if age < 20:
    print("You're less than 20 years old.")
elif age < 30:
    print("You're less than 30 years old.")
elif age < 40:
    print("You're less than 40 years old.")
else:
    print("Your age is something else.")

print("Thank you for using the application!")

# NEW FILE

# ask user's age (integer)
age = input("How old are you?\n")
age = int(age)

# ask month number
month = input("Which month you wish to visit the store?\n")
month = int(month)

# is the user less than 20 years old?
# if yes => print "You're less than 20 years old."
# if not => go to the else -statement
if age < 20:
    print("You're less than 20 years old.")
elif age < 30:
    print("You're less than 30 years old.")
elif age < 40:
    print("You're less than 40 years old.")
else:
    print("Your age is something else.")

# separate if-statement for month-number
if month == 7:
    print("We're closed on July.")
    print("Back open in August, welcome!")

print("Thank you for using the application!")

# NEW FILE

price = 200
age = 21

# if user is under 18 years old
if age < 18:
    # replace the price with the old price * 0.9 (10% discount)
    price = price * 0.9
else:
    # for customers 18 years old or more,
    # price is the old price + 4.95 postage
    price = price + 4.95

# since we are modifying the price only in the if/else
# print out the price whatever it is now!
print(f"Total sum: {price} €")

# NEW FILE

age = input("How old are you?\n")
age = int(age)

# less than 30
if age < 30:
    print("Less than 30 years old.")

# 30 or more
if age >= 30:
    print("30 years old or more.")

# is age exactly 30 => use two == signs
# because one = means creating a variable
if age == 30:
    print("Exactly 30 years old.")

# is age something else than exactly 30
if age != 30:
    print("You're not exactly 30 years old.")

# NEW FILE

# ask one number from user
# remember always to convert your input into numeric format
# because otherwise you compare text to numbers
number1 = input("Give a number:\n")
number1 = int(number1)

number2 = 234

# if one of these numbers is still text format
# (no int/float used), this can be very buggy
if number1 > number2:
    print("The first number is bigger!")
else:
    print("The second number is bigger")

# NEW FILE

# ask user a sales code
sales_code = input("Give your discount code:\n")

current_code = "WINTER24"

# for example if "FALL23" == "WINTER24"
# we can't use > or < with text, since
# if "banana" > "firetruck" -> doesn't make any sense
if sales_code == current_code:
    print("Discount to price, -20%!")
else:
    print("Normal price.")

# NEW FILE

# ask user the product
drink = input("What would you like to drink?\n")

# if-elif-else -> structure
# -> react to different user responses
# else -> drink not found

if drink == "milk":
    print("Price of milk: 1 €")
elif drink == "coffee":
    print("Price of coffee: 7 €")
elif drink == "water":
    print("Free, drink from the tap.")
else:
    print("Drink not found.")

# NEW FILE

# ask the user if they are student or not
choice = input("Are you a student? (s/o)\n")

# if is student
if choice == "s":
    print("This code only considers students")
    print("For example, calculate ticket price etc.")
elif choice == "o":
    print("Calculate price for other customers etc.")
else:
    print("Incorrect selection. Please restart the application.")

# NEW FILE

number = input("Give a number:\n")
number = int(number)

# if remainder of the number when dividing by 2
# is exactly zero => even number
# if not (else) => odd number
if number % 2 == 0:
    print("Even number")
else:
    print("Odd number")

# NEW FILE

number = input("Give a number:\n")
number = int(number)

# is number between 0 and 30, or in the range 0-30
if number > 0 and number < 30:
    print("Number is in the range 0-30")

# is number less than 0 OR more than 30
if number < 0 or number > 30:
    print("Number is less than 0, or more than 30")
    print("Basically, this is the opposite of the previous statement.")

# NEW FILE

number = input("Give a number:\n")
number = int(number)

# is number between 0 and 30, or in the range 0-30
# this is the recommended shorthand in Python
# for numeric range checks
if 0 <= number <= 30:
    print("Number is in the range 0-30")

# NEW FILE

year = input("Give a year (2000-2012)\n")
year = int(year)

# easy to compare a bunch of range values
# always double-check all comparisons
# and try your with test values
# ESPECIALLY THE BOUNDARY VALUES
# for example, 2004, 2008, 2012
if 2000 <= year < 2004:
    print("2000-2004")
elif 2004 <= year < 2008:
    print("2004-2008")
elif 2008 <= year < 2012:
    print("2008-2012")
else:
    print("Incorrect year.")

# NEW FILE

age = 20
city = "Rovaniemi"
student = True

# condition that is depending on three different variables
if age >= 18 and city == "Rovaniemi" and student == True:
    print("An adult student from Rovaniemi")
    print("If for some reason you need to have a very specific condition")
    print("For example, marketing or information purposes, you can do this.")

print("Thank you for using our application.")