Program to find area of circle in C code

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#include<iostream.h>
#include<conio.h>
void main()
{
  int r;
  float a;
  clrscr();
   cout<<"Enter radius of circle"<<endl;
   cin>>r;
   cout<<"Area of circle is =";
   a=3.14*r*r;
   cout<<a;
   getch();
}


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