$1.$ Change the add function, so that it receives two AltMoney objects which it adds together

and returns one object AltMoney as the result of the addition.

Note that in the above version of the program, you have passed the object sum as call$-$byreference.

$2.$ Add a new friend function, subtract, that computes the subtraction of one money from the

other. This function must receive by parameters two AltMoney objects which it will

subtract and return an AltMoney object with the result.

$3.$ Make read$\_$money a member function. Note that if you make read$\_$money a member

function, then you can use it to directly initialize the dollars and cents of an AltMoney type

object directly.

#include

#include

using namespace std;

class AltMoney

$\{$

public:

AltMoney$()$;

AltMoney$($int d$,$ int c$)$;

friend void add$($AltMoney m$1,$ AltMoney m$2,$ AltMoney &sum$)$;

void display$\_$money$()$;

private:

int dollars;

int cents;

$\}$;

void read$\_$money$($int& d$,$ int& c$)$;

int main$()$

$\{$

int d$,$ c;

AltMoney m$1,$ m$2,$ sum;

sum $=$ AltMoney$(0,0)$;

read$\_$money$($d$,$ c$)$;

m$1=$ AltMoney$($d$,$ c$)$;

cout $<<$ "The first money is:$"$;

m$1.$display$\_$money$()$;

read$\_$money$($d$,$ c$)$;

m$2=$ AltMoney$($d$,$ c$)$;

cout $<<$ "The second money is:$"$;

m$2.$display$\_$money$()$;

add$($m$1,$ m$2,$ sum$)$;

cout $<<$ "The sum is:$"$;

sum.display$\_$money$()$;

return $0$;

$\}$

AltMoney::AltMoney$()$

$\{$

$\}$

AltMoney::AltMoney$($int d$,$ int c$)$

$\{$

dollars $=$ d;

cents $=$ c;

$\}$

void AltMoney::display$\_$money$()$

$\{$

cout $<<"$$$"<<$ dollars $<<"."$;

if$($cents $<=9)$

cout $<<"0"$; $//$to display a $0$ in the left for numbers less than $10$

cout $<<$ cents $<<$ endl;

$\}$

void add$($AltMoney m$1,$ AltMoney m$2,$ AltMoney &sum$)$

$\{$

int extra $=0$;

sum.cents $=$ m$1.$cents $+$ m$2.$cents;

if$($sum$.$cents $>=100)$

$\{$

sum.cents $=$ sum.cents $-100$;

extra $=1$;

$\}$

sum.dollars $=$ m$1.$dollars $+$ m$2.$dollars $+$ extra;

$\}$

void read$\_$money$($int &d$,$ int &c$)$

$\{$

cout $<<$ "Enter dollar

$"$;

cin $>>$ d;

cout $<<$ "Enter cents

$"$;

cin $>>$ c;

if$($ d $<0||$ c $<0)$

$\{$

cout $<<$ "Invalid dollars and cents, negative values

$"$;

exit$(1)$;

$\}$

$\}$