#include

#include

$//$ Function Declaration

int getOption$($void$)$;

void getData$($int$*$ a$,$ int$*$ b$)$;

float calc$($int option, int num$1,$ int num$2)$;

float add$($float num$1,$ float num$2)$;

float sub$($float num$1,$ float num$2)$;

float mul$($float num$1,$ float num$2)$;

float divn$($float num$1,$ float num$2)$;

void printResult$($float num$1,$ float num$2,$

float results, int option$)$;

int main$($void$)$

$\{$

$//$ Local Declarations

int done $=0$;

int option;

float num$1$;

float num$2$;

float result;

$//$ Statments

while $(!$done$)$

$\{$

option $=$ getOption$()$;

if $($option $==5)$

done $=1$;

else

$\{$

do

$\{$

printf$("\backslash$

Enter two numbers: $")$;

scanf$\_$s$("\%$f $\%$f$",$ &num$1,$ &num$2)$;

if $($option $==4$ && num$2==0)$

$\{$

printf$("\backslash$a

$***$ Error $***")$;

printf$("$Second number cannot be $0$

$")$;

$\}//$ if

$\}$ while $($option $==4$ && num$2==0)$;

switch $($option$)$

$\{$

case $1$: result $=$ add$($num$1,$num$2)$;

break;

case $2$: result $=$ sub$($num$1,$ num$2)$;

break;

case $3$: result $=$ mul$($num$1,$ num$2)$;

break;

case $4$: result $=$ divn$($num$1,$ num$2)$;

$\}//$ switch

printResult$($num$1,$ num$2,$ result, option$)$;

$\}//$ else option $!=5$

$\}//$ while

printf$("$

Thank you for using Calculator.

$")$;

return $0$;

$\}//$ Main

$/*============$ getOption$==============$

This function shows a menu and reads the user options.

Pre nothing

Post returns a valid option

$*/$

int getOption$($void$)$

$\{$

$//$ Local Decelaration

int option;

$//$ Statment

do

$\{$

printf$("$

$*******************")$;

printf$("$

$*$ Menu $*")$;

printf$("$

$**")$;

printf$("$

$*1.$ ADD $*")$;

printf$("$

$*2.$ SUBTRACT $*")$;

printf$("$

$*3.$ MULTIPLY $*")$;

printf$("$

$*4.$ DIVIDE $*")$;

printf$("$

$*5.$ QUIT $*")$;

printf$("$

$**")$;

printf$("$

$*******************")$;

printf$("$

Please type your choice $")$;

printf$("$and press the return key : $")$;

scanf$\_$s$("\%$d$",$ &option$)$;

if $($option $<1||$ option $>5)$

printf$("$Invalid option. Please re$-$enter.

$")$;

$\}$ while $($option $<1||$ option $>5)$;

return option;

$\}//$ get option