why is my code not working?

Write a program that outputs " Z is " followed by the value of z to three digits after the decimal point. On the next line, the program outputs "Z's square is " followed by the value of zSquare to four digits after the decimal point. End with a newline. Ex: If the input is 2.000, then the output is: z is 2.000 Z's square is 4.0000