Complete problem $6\mathrm{.}19$a$.$ Only provide the Pep$/9$ program file and code. Don't provided the C program.$$

$//$C code for $6\mathrm{.}19$a

#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 $0$;

$\}$