# This program calculates the perimeter and area of different shapes

print ("This program calculates the perimeter and area of different shapes")

keep_going == "":
while keep_going: 

shape = input("choose a shape from square, rectangle or circle ")
#check user input
if shape == "square":
    print ("square")
    side = float(input("Enter the lenght of a side "))
    square_area = side **2
    square_perimeter = side *4
    print (f"The perimeter of a square with a length of {side} is {square_perimeter} "
           f"the area is {square_area}")
elif shape == "rectangle":
    print ("rectangle")
    length = float(input("Enter the length of the rectangle "))
    width = float(input("Enter the width of the rectangle "))
    perimeter = (length + width) * 2
    area = width * length
    print (f"The perimeter of the rectangle is {perimeter} "
            f"the area is {area}")

elif:
    print ("circle")
    radius = float(input("What is the radius? "))
    area = 3.14 * radius**2
    circumference = 2 * 3.14 * radius
    print (f"The area of the circle is {area}, the circumference is {circumference} m")
    
else:
    print("That is not a valid shape")
    
print("The program has ended")