Lab #$6$

Write a program that creates a calculator as follows:

If the user enters $3\mathrm{.}5$ in the first text field and $2\mathrm{.}1$ in the second text field and clicks the Add button, then the result $5\mathrm{.}6$ will be displayed in the third text field. If the user clicks the Subtract button, then the result $1\mathrm{.}4$ will be displayed in the third text field. If the user clicks the Clear button, all three text fields should be cleared.