//program to calculate area of a circle,rectangle,scalene triangle using function overloading
#include<iostream.h>
#include<conio.h>
#include<math.h>

void area(float r)
{ cout<<"\nArea of triangle is :"
      <<(4* 3.14*r);
}

void area(int L, int B)
{ cout<<"\nArea of rectangle is :"
      <<(L*B);
}

void area(float a, float b, float c)
{float s=(a+b+c)/2;
 cout<<"\nArea of scalene triangle is :"
      <<sqrt(s*(s-a)*(s-b)*(s-c));
}

void main()
{
clrscr();
int L,B;
float r,a,b,c;
int ch;
cout<<"\n Press 1 to calculate area of circle.";
cout<<"\n Press 2 to calculate area of rectangle.";
cout<<"\n Press 3 to calculate area of scalene triangle.";
cout<<"\n Enter your choice: ";
cin>>ch;
if(ch==1)
{ cout<<"\n Enter radius of the circle: ";
  cin>>r;
  area(r);
}
else if(ch==2)
{ cout<<"\n Enter length & breadth of the rectangle: " ;
  cin>>L>>B;
  area(L,B);
}
else if(ch==3)
{ cout<<"\n Enter three sides of the triangle : ";
  cin>>a>>b>>c;
  area(a,b,c);
}
else
 cout<<"\n You have entered wrong choice!!!!";
 getch();
}