HW$\_2$b

Review the program on this page, and then answer questions on the next page.

#include

using namespace std;

$//$ Function Prototypes

void isNumberValid$($int number$)$; $//$ This function is a

$//$ void$-$returning function.

int getNumber$()$; $//$ Notice that this function

$//$ returns a value $($int$).$

int main $()$

number

$?\{$

int number;

number $=$ getNumber$()$; $//1$st Function call

$//$ After function, number has $-4.$

number

$-4$

isNumberValid$($number$)$; $//2$nd Function call

return $0$;

$\}$

$//===============================================================$

$//====$ Function definition $==============================================$

int getNumber $()$

$\{$

int negNumber; $//$ Variable declaration

cout $<<$ "Enter a negative number: $"$;

cin $>>$ negNumber; $//($Assume user enters $-4)$

return negNumber; $//-4$ is returned to main.

$\}$

$//===============================================================$

$//====$ Function definition $==============================================$

void isNumberValid$($int number$)//$ void$-$returning function

$\{//($no value is returned to main$)$

if $($number $<0)$

cout $<<$Valid number.$$;

else

cout $<<$Invalid number.$$;

$\}$

$//===============================================================$

Fill in the stack to reflect the stack immediately

after the first function call $($getNumber$).$

Note: All stack elements are not be needed.

number

$-4$

Enter any known values in the stack

$($Enter a $?$ if value is not known$)$