Program for class and class data member and member function

Program for class:

#include<iostream>

using namespace std;

class rectangle

{

private:

float length;

float width;

float area;

public:

void setdata(float, float);

void calarea();

float getlength();

float getwidth();

float getarea();

};

void rectangle::setdata(float l, float w)

{

length=l;

width=w;

}

void rectangle ::calarea()

{

area=length*width;

}

float rectangle ::getlength()

{

return length;

}

float rectangle ::getwidth()

{

return width;

}

float rectangle ::getarea()

{

return area;

}

int main()

{

rectangle box;

float boxlength,boxwidth;

cout<<" what is length ";

cin>>boxlength;

cout<<"what is width ";

cin>>boxwidth;

box.setdata(boxlength,boxwidth);

box.calarea();

cout<<"here is the rectangle's data : \n";

cout<<"\n length : "<< box.getlength()<<endl;

cout<<" width : "<< box.getwidth() <<endl;

cout<<" area : "<<box.getarea() <<endl;

}

output:

what is length 12

what is width 12

here is the rectangle's data :

 length : 12

 width : 12

 area : 144