Write a C program that converts an uppercase character to a lowercase character. Declare function

char toLower$($char ch$)$;

to do the conversion. If ch is not an uppercase character, the function should return ch unchanged. If it is an uppercase character, add the difference of $\text{'}$a$\text{'}$ and $\text{'}$A$\text{'}$ to ch as the return value. $($a$)$ Write your program with a global variable for the actual parameter. Translate your C program to Pep$/9$ assembly language.

The C code:

#include

char myChar;

char toLower$($char ch$)\{$

if $(($ch $>=$A$)$ && $($ch $<=$Z$))\{$

return ch $+$a$-$A$$;

$\}$

else $\{$

return ch;

$\}$

$\}$

int main $()\{$

scanf$(\%$c$,$ &myChar$)$;

printf$(\%$c

$,$ toLower$($myChar$))$;

return $0$;

$\}$