##Demonstrate basic variable assignment
x_int=3
x_int = x_int * x_int
print(x_int)

####Notice that objects have types, but names don't
##x=3
##print(x," of type ", type(x))
##x="three"
##print(x," of type ", type(x))

####Getting input from the user
##y = input("what is your name? ")
##print("hello, ", y)

####Input always returns a string
##y = input("enter a number: ")
##print(type(y))
##print(y)

####Use a constructor to get numbers from the user
##y = input("enter a number: ")
##y_float = float(y)
##print(type(y_float))
##print(y_float)
##print("the square of your number is ", y_float * y_float)

## class exercise 1
# Write a Tipping Calculator
# You should prompt the user for a bill amount and a tip percentage
# Display the tip amount and the total including tip

####Demonstrate formatting of strings
##tip = 23.425928
##tip_sentence="The tip is ${:.2f}."
##print(tip_sentence.format(tip))

####A couple more formatting examples
##print("Formatted wider: ${:10.2f}.".format(tip))
##print("Wider and left justified: ${:<10.2f}.".format(tip))
##tip_percent = 0.16
##print("The tip percentage under default formatting is {} and as a percentage is {:.2%}.".format(tip_percent, tip_percent))
####find more rules in the textbook, section 4.4

####Class Exercise 2
###prompt the user for several words
###insert the words into a few lines of text.
###You can write your own string, or use the string below.
##madlib_str="""Four {} and seven {} ago our {}
##brought forth on this {} a new {}, conceived
##in {}, and dedicated to the {}
##that all {} are created {}."""
##print(madlib_str)