C++ program to calculate area of rectangle using constructor

Asked by admin @ 23/08/2021 in Computer Science viewed by 346 People

C++ program to calculate area of traingle circle and rectangle using constructor overloading

Answered by admin @ 23/08/2021

Q. Write a C++ program to calculate the area of triangle, rectangle and circle using constructor overloading. The program should be menu driven.

Answer:

Constructors have same name of the class but with number of arguments. Constructors can be overloaded.

Following program is displaying the work of overloaded constructors.

#include<iostream>

#include<math.h>

#include<cstdlib>

using namespace std;

class area

{

float ar;

public:

area(float r)

{

ar=3.14*r*r;

}

area(float l, float b)

{

ar=l*b;

}

area(float a, float b, float c)

{

float s;

s=(a+b+c)/2;

ar=s*(s-a)*(s-b)*(s-c);

ar=pow(ar,0.5);

}

void display()

{

cout<<"\n Area : "<<ar;

}

};

int main()

{

int ch;

float x, y, z;

{

<<"\n\n 1. Area of Circle";

cout<<"\n 2. Area of Rectangle";

cout<<"\n 3. Area of Triangle";

cout<<"\n 4. Exit";

cout<<"\n\n Enter Your Choice : ";

cin>>ch;

switch(ch)

{

case 1 :

{

cout<<"\n Enter Radius of the Circle : ";

cin>>x;

area a1(x); //Class area, object is created : a1

a1.display();

}

break;

case 2 :

{

cout<<"\n Enter Length and Breadth of the Rectangle : ";

cin>>x>>y;

area a2(x,y);

a2.display();

}

break;

case 3 :

{

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

cin>>x>>y>>z;

area a3(x,y,z);

a3.display();

}

break;

case 4 :

exit(0);

default :

cout<<"\n\n Invalid Choice ...";

}

} while(ch!=4);

return 0;

}

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