Passing objects as arguments(headerfiles are iostream.h and conio.h)

#include
#include
class add
{
private:
int a,b;
public:
void read_number();
void add_func(add,add);
void show_sum();
};
void add::read_number()
{
cout<<"\n\nENTER THE 1 NUMBER=";
cin>>a;
cout<<"\n\nENTER THE 2 NUMBER=";
cin>>b;
}
void add::add_func(add ad1,add ad2)
{
a=ad1.a+ad2.a; //IMPTORTANT FUNCTION
b=ad1.b+ad2.b;
}
void add::show_sum()
{
cout<<"\n\nSUM OBTAINED AFTER ADDING=";
cout<}
int main()
{
clrscr();
add add1,add2,add3;
add1.read_number();
add2.read_number();
add3.add_func(add1,add2);
add3.show_sum();
getch();
return(0);
}
/*********************************
OUTPUT
***********************************


ENTER THE 1 NUMBER=2

ENTER THE 2 NUMBER=2

ENTER THE 1 NUMBER=3

ENTER THE 2 NUMBER=3

SUM OBTAINED AFTER ADDING=5
5
*/