response = input("Do you want to calculate the volume of a cylinder or the volume of a cuboid? (CL OR CU) ")
realPi = float(3.14159)

def cylindervol(radius,length):
    realVolume = realPi*realRadius*realLength
    print('The volume of the cylinder is ')
    print(realVolume)

while str.lower(response)=="cl":
    realRadius=float(input('enter the radius of the cylinder :'))
    realLength=float(input('enter the length of the cylinder :'))
    cylindervol(realRadius,realLength)
    strCalculate=input('do you want to calculate another? (y or n)')

print('thank you for using the cylinder calculator')