a$.$ Classify each formal parameter of double$\_$trouble and trouble as input, output, or input$/$output$.$

b$.$ What values of $x$ and $y$ are displayed by this program? $($Hint: Sketch the data areas of main, trouble, and double$\_$trouble as the program executes.$)$

void double$\_$trouble $($int $*$p$,$ int y$)$;

void trouble $($int $*$x$,$ int $($:${?}^{**}y\}$;

int

main$($void$)$

$\{$

int $x,y$;

ters and Modular Programming

trouble $($&x$,$ &y$)$;

printf $("$x $=$ zd$,y=z\frac{d}{?}$

$,x,y$;

return $(0)$;

$\}$

void

double$\_$trouble$($int $*$p$,$ int y$)$

$\{$

int $x$;

$x=10$;

${?}^{**}p=2**x-y$;

$\}$

void

trouble$($int ${?}^{**x},$ int $($:${?}^{**y}\}$

$\{$

double$\_$trouble $(x,7)$;

double$\_$trouble $(y,{?}^{**}x)$;

$\}$