Write a program that prompts the user to enter a filename in the text field and displays the occurrence

of each letter in the file in the corresponding text fields in the GUI when the user clicks the count button.

$(50$p$)$

Write a program that reads the contents of a file and creates an exact copy of the file, except that each

line is numbered. For example, if the input file contains the following text: $(50$p$)$

'Twas brillig, and the slithy toves

Did gyre and gimble in the wabe;

All mimsy were the borogoves,

And the mome raths outgrabe.

Lewis Carroll

then the output file should appear something like this:

$1$: 'Twas brillig, and the slithy toves

$2$: Did gyre and gimble in the wabe;

$3$: All mimsy were the borogoves,

$4$: And the mome raths outgrabe.

$5$ : $$

Lewis Carroll

he user should be able to enter the names of the input and output files from the keyboard.