The document contains C++ code that defines a class called 'space' with member variables x, y, and z. It overloads the unary minus operator - to negate the values of x and y and calculate the sum of the negated values, which is assigned to z. Another class called 'coord' represents 2D coordinates, overloads the + operator to add two coord objects, and returns a new coord object with the summed x and y values. The main function demonstrates creating coord objects, adding two of them, and printing the result.

2. #include<iostream.h>
#include<conio.h>
class space
{
int x ,y,z;
public:
void getdata(int a, int b)
{
x=a;
y=b;
}
void display()
{
cout<<"value of x "<<x<<endl;
cout<<"value of y "<<y<<endl;
}
void operator-()
{
x=-x;
y=-y;
z=x+y;
cout<<"Sum of x+y ="<<z<<endl;
}
};
void main()
{
clrscr();
space s;
s.getdata(10,-20);
s.display();
-s;
s.display();
getch();
}

3. class coord {
int x, y;
public:
coord() {x=0, y=0;}
coord(int i, int j) {x=i; y=j;}
void get_xy(int &i, int &j) {i=x, j=y;}
coord operator+(coord ob2);
};
coord coord::operator+(coord ob2)
{
coord temp;
temp.x=x+ob2.x;
temp.y=y+ob2.y;
return temp;
}
main()
{ int x, y;
coord o1(10, 10), o2(4, 8), o3;
o3=o1+o2;
o3.get_xy(x, y)
cout<<“o3 coordinates are: x: “<<x<<“ y: “<<y<<endl;
}