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rectangle.cpp

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//class and object

#include<iostream>

using namespace std;

class rectangle

{

float area,peri,length,breadth;

public: void cal_area()

{

area=length*breadth;

}

void cal_peri()

{

peri=length+breadth;

}

void disp()

{

cout<<"Length:"<<length<<endl;

cout<<"Breadth:"<<breadth<<endl;

cout<<"Area:"<<area<<endl;

cout<<"Perimeter:"<<peri<<endl;

}

void set_data()

{

cout<<"enter length and breadth"<<endl;

cin>>length;

cin>>breadth;

area=peri=0;

}

};

int main()

{

rectangle robj; //rectangle is an user defined datatype and robj is an object of rectangle class

cout<<"size of robj:"<<sizeof(robj)<<endl;

robj.set_data();

robj.cal_area();

robj.cal_peri();

robj.disp();

}