Change case

The program ``pcase.exe'' will change the case of the selection in four different ways depending on the argument it is given:

1

⇒ Change all letters in the selection to upper case

2

⇒ Change all letters in the selection to lower case

3

⇒ Change the case of all letters in the selection

4

⇒ Make the first letter of each word in the selection upper case and make all the other letters lower case

If no argument is passed, will prompt the user for the argument.

***The code demonstrates? (below)How do you get to see it?***

The code ``pcase.c'' demonstrates how to read characters, how to get and set the selection, how to insert and delete characters, and how to get an input string from the user using the software interrupts.