# Lecture 2, math-, random- and datetime-modules!
print("Welcome!")

# in Windows sometimes, \n does not work, use \r instead (carriage return)
print("Today we'll go through\n\n\nsome modules!")

# using tabs
bill = 499
print(f"Total:\t\t\t {bill}")
print(f"Grand total:\t {bill}")

# NEW FILE

# get two values from user and sum them up
number1 = input("First number:\n")
number1 = int(number1)

number2 = input("Second number:\n")
number2 = int(number2)

total = number1 + number2
print(f"Total: {total}")

# NEW FILE

import math

print(math.pi)

number = input("Give a decimal number:\n")
number = float(number)

number = round(number, 2)

print(number)

# NEW FILE

import math

# powers, 4 to power of 6
number1 = math.pow(4, 6)
print(number1)

# python 3, this works too
number2 = 4 ** 6
print(number2)

# square roots
number3 = 9
square = math.sqrt(number3)
print(square)

# circumference = 2 * pi * r
radius = 5
border = 2 * math.pi * radius
print(border)

# cube diagonal
# d = √3 x
side = 15
diagonal = math.sqrt(3) * side
print(diagonal)

# NEW FILE

import random

# generate a random number between 1-20
guess = random.randint(1, 20)
print(guess)
print()

# two standard dice, 1-6
dice1 = random.randint(1, 6)
dice2 = random.randint(1, 6)

# print dice values
print(dice1)
print(dice2)

# total value of two dice
print(dice1 + dice2)

# NEW FILE
# date example

from datetime import date

today = date.today()
print(today)


# NEW FILE
# datetime example

from datetime import datetime

today = datetime.now()
print(today)

# %d = day, %m = month, %Y = year, %H = hour, %M = minute, %S = second
date_text = today.strftime("%d.%m.%Y %H:%M:%S")
print(date_text)


# NEW FILE
# the floating point number problem with small decimals

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)

number3 = Decimal("0.1")
number4 = Decimal("0.2")

print(number3 + number4)