Some important programs part 4

1. To demonstrate the concept of function overloading applied to the member functions.

#include<iostream> 

using namespace std;

#include<stdlib.h> 

#define pi 3.14

class fn

{

public:

void area(int); //circle

void area(int,int);

void area(float,int,int); //rectangle void area(float ,int,int); //triangle

};

void fn::area(int a)

{

cout<<"Area of Circle:"<<pi*a*a;

}

void fn::area(int a,int b)

{

cout<<"Area of rectangle:"<<a*b;

}

void fn::area(float t,int a,int b)

{

cout<<"Area of triangle:"<<t*a*b;

}

int main()

{

int ch; 

int a,b,r; 

fn obj;

cout<<"\n\t\tFunction Overloading in Polymorphism";

cout<<"\n1.Area of Circle\n2.Area of Rectangle\n3.Area of Triangle\n4.Exit\n"; 

cout<<"\nEnter your Choice:";

cin>>ch; 

switch(ch)

{

case 1:

cout<<"Enter Radius of the Circle:"; cin>>r;

obj.area(r); 

break;

case 2:

cout<<"Enter Sides of the Rectangle:";

cin>>a>>b;

obj.area(a,b);

break; 

case 3:

cout<<"Enter Sides of the Triangle:"; 

cin>>a>>b;

obj.area(0.5,a,b);

break;

case 4:

exit(0);

}

return 0;

}

2. To implement the use of Sum of Feet and Inches passing and returning object

#include<iostream> 

using namespace std;

class length

{

private:

int feet,inches; 

public:

void get(int f,int i)

{

feet=f; 

inches=i;

}

void putdata()

{

cout<<"Feet="<<feet; 

cout<<"\tInches="<<inches;

}

friend length sum(length,length);

};

length sum(length a,length b)

{

length l; 

l.feet=a.feet+b.feet;

 l.inches=a.inches+b.inches; 

return l;

}

int main()

{

length l1,l2,s;

 l1.get(5,6);

cout<<"\nFirst value of feet and inches:\n"; 

l1.putdata();

l2.get(6,2);

cout<<"\nSecond value of feet and inches:\n"; 

l2.putdata();

s=sum(l1,l2);

cout<<"\nSum of values:\n";

 s.putdata();

return 0;

}

3. To demonstrate the use of constructor with its types and destructor

3a: To implement the use of Constructor

#include <iostream> 

using namespace std;

class Wall { 

private:

double length;

public: 

Wall() 

{

length = 6.8;

cout << "Creating a wall." << endl; 

cout << "Length = " << length << endl;

}

};

int main()

{

Wall wall1;

return 0;

}

3b: To implement the use of destructors

#include <iostream> 

using namespace std; 

class Line 

{
public:
void setLength( double len ); 

double getLength( void ); 

Line();
~Line();
private:
double length;
};
 
Line::Line(void) {
cout << "Object is being created" << endl;
}
Line::~Line(void) {
cout << "Object is being deleted" << endl;
}
void Line::setLength( double len ) { length = len;
}
double Line::getLength( void ) { return length;
}

int main() 

{ 

Line line;
line.setLength(6.8);
cout << "Length of line : " << line.getLength() <<endl;
return 0;

}

4.Illustrate the use of static data member and static member function

#include<iostream> 

using namespace std; 

class stat

{

int code;

static int count; 

public:

stat()

{

code=++count;

}

void showcode()

{

cout<<"\n\tObject number is :"<<code;

}

static void showcount()

{

cout<<"\n\tCount Objects :"<<count;

}

};

int stat::count; 

int main()

{

stat obj1,obj2;

obj1.showcount(); 

obj1.showcode(); 

obj2.showcount(); 

obj2.showcode(); 

return 0;

}

5. To implement the use of array of objects

#include <iostream> 

using namespace std; 

class MyClass {

int x; 

public:

void setX(int i)

{

    x = i; 

} 

int getX() 

{ 

    return x;

}

};

int main()

{

MyClass obs[4];

int i;

for(i=0; i < 4; i++) 

obs[i].setX(i);

for(i=0; i < 4; i++)

cout << "obs[" << i << "].getX(): " << obs[i].getX() << "\n";

return 0;

}

 

Note: The programs given here are pre compiled and pre runned. The remaining parts of the program will be in the next part