C++ program to calculate area of a circle,a rectangle or a triangle depending upon user's choice




#include<iostream.h>
#include<conio.h>
#include<math.h>


void main()
{
clrscr(); //to clear the screen
float a,b,c,s,r,area;
int ch;
cout<<"***Menu***\n1.Area of circle\n2.Area of Rectangle";
cout<<"\n3.Area of triangle\nEnter your choice:";
cin>>ch;

switch(ch)
{
case 1:
{
cout<<"\nEnter radius of the circle:";
cin>>r;
area=3.14*r*r;
break;
}
case 2:
{
cout<<"\nEnter length and breadth:";
cin>>a>>b;
area=a*b;
break;
}
case 3:
{
cout<<"\nEnter three sides of the triangle:";
cin>>a>>b>>c;
s=(a+b+c)/2;
area=sqrt(s*(s-a)*(s-b)*(s-c));
break;
}
default: cout<<"\nWrong choice...!!!";
break;
}


cout<<"Area="<<area;
getch(); //to stop the screen
}


  

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