C++ Practical Section 8

36.   Example of Static Data Member
Answer :

#include<iostream.h>
#include<conio.h>

class item
{
int itemno;
char iname;
static int icount;

Public:
item(int no, char n[])
{
itemno = ino; strcpy(iname,n);
icount++;
}
Void showdata()
{
cout<<"itemno="<<itemno;
cout<<"\n item name="<<iname;
}
Void showcount()
{
cout<<"\n Count="<<icount;
}
}
int item :: icount;

Void main()
{
item I1(101,"Pen");
item I2(102,"Pencil");

I1.showdata();
I2.showdata();
I1.showcount();
getch();
}

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37. Example of Static Member Function
Answer :

#include<iostream.h>
#include<conio.h>

Static Voidshow count()
{
cout<<"\n Count="<<icount;
}
};
int item :: icount;
Void main()
{
item :: showcount();
item I1(101, "Pen");
item I2(102, "Pencil");
I1.showdata();
I2.showdata();
item::showcount();
getch();
}

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38.  Example of Friend Function.

Answer :

#include<iostream.h>

#include<conio.h>

Class ABC;

Class XYZ

{

int x;

Public:setvalue(int i)

{

x=i;

}

friend Void max(XYZ,ABC);

};

Class ABC

{

int a;

Public:

Void Setvalue(int i)

{

a=i;

}

friend Voidmax(XYZ,ABC);

};

Void max(XYZ m, ABC n)

{

if(m.x>=n.a)

cout<<m.x;

else

cout<<n.a;

}

Void main()

{

ABC obj1;

obj1.setvalue(10);

XYZ obj2;

obj2.setvalue(20);

max (obj1,obj2);

getch();

}

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39.  Example of Operator Overloading.

Answer :

#include<iostream.h>

#include<conio.h>

class XYZ

{

int x;

int y;

Public:

Void setvalue(int i, int j)

{

x=i;y=j;

}

Void showvalue()

{

cout<<\n x="<<x<<\n y="<<y;

}

Void operator -()

{

x=-x; y=-y;

}

};

Void main()

{

XYZ obj;

obj.setvalue(10,-20);

obj.showvalue();

-obj;

obj.showvalue();

getch();

}

...................................................................................................................................................................

40. 

Answer :

#include<iostream.h>

#include<conio.h>

Class complex

{

float real,c;

float image;

Public:

complex()

{

real=0.0F;

image=0.0F;

}

complex(float r, float i)

{

real = r; image =i;

}

Void show();

complex operator + (complex);

};

Void complex :: show()

{

cout<<endl<<real<<"+"<<image<<"i";

}

complex complex :: operator + (complex c)

{

complex t;

t.real = real+c, real;

t.image = image+c, image;

return t;

}

Void main()

{

clrscr();

complex c1(10.7F, 8.5F);

complex c2(5.8F, 4.2F);

complex c3;

c3 = c1+c2;

c1.show();

c2.show();

cout<<"\n ";

c3.show();

getch();

}

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