This is C$++$ simple calculator program. Read the instructions carefully also the comments of my code. Provide a code with explaition. The screenshot has the functions for SimpleCalc.h$.$ SimpleCalc.cpp #include "SimpleCalc.h$"$

#include

void SimpleCalc::Calculate$()$

$\{$

switch $($operation$)$

$\{$

case'$+\text{'}$:

answer $=$ operand$1+$ operand$2$;

desc $=$ "addition";

case'$/\text{'}$:

$//$check to see if operand is $0$

if$($operand$2==0)$

$\{$

desc $="$No division by $0!"$;

$\}$

else

$\{$

$//$regular division

desc $=$ "division";

$\}$

break;

default:

$//$handle an operation that is not acceptable

desc $=$ "That operation is not allowed. Please try again";

$\}$

$\}$

SimpleCalc::SimpleCalc$()$

$\{$

$\}$

void SimpleCalc::SetOperation$($char oper, double op$1,$ double op$2)$

$\{$

operation $=$ oper;

operand$1=$ op$1$;

operand$2=$ op$2$;

$//$check if operand$2=0$ and operation is division

$//$then set desc and don't even call calculate

Calculate$()$;

$\}$

string SimpleCalc::GetResults$()$

$\{$

$//$creat a string that says "Your operation is addition: $5+7=12$

$//$or your operation is division: $6/0$ Illegal Operation!

$//$check to see if the operation was illegal or if the operation was not set

$//$a valid one. Then make a different desc.

$//$return string;

$\}$ Driver.cpp #include "SimpleCalc.h$"$

#include

using namespace std;

bool DoAnother$()$;

int main$()$

$\{$

$//$cout a course header

cout $$ "Welcome to Simple Calculator!";

$//$declare any variables you need and create a SimpleCalc object

char ans$\{\text{'}$y$\text{'}\}$;

string results;

SimpleCalc calc;

$//$start a play loop

do $\{$

$//$ask the user for the operation and the two operands

$//$use the object to SetOperation

calc.SetOperation$($op$,$ num$1,$ num$2)$;

$//$call GetResults and show them

cout $$ calc.GetResults$()$;

$//$ask the user if they want to go again

cout Do you want to calculate another? y$/$n$"$;

cin $>>$ ans;

$\}$ while $($DoAnother$())$;

$//$finish with the loop

$//$cout a goodbye message

cout $$ "Thank you for using Simple Calculator, Goodbye!";

return $0$;

$\}$

bool DoAnother$()$

$\{$

char ans$\{\text{'}$y$\text{'}\}$;

cout Do you want to calculate another? y$/$n$"$;

cin $>>$ ans;

$//$check

if $($ans $==\text{'}$y$\text{'})$

return true;

return false