Experiment $3.$ Switch between lowercase and uppercase

You can manipulate ASCII codes to do things like change between uppercase and lowercase. Use the

following rules, based on each character$$s ASCII code:

$1)$ if $>=0$x$41$ and $<=0$x$5$A$,$ add $0$x$20$ to make lowercase

$2)$ if $>=0$x$61$ and $<=0$x$7$A$,$ subtract $0$x$20$ to make uppercase

Update your interrupt code to do this conversion. Try it with different inputs $($change the contents of

data.txt$)$ and record the input and output.