/* ECP: FILEname=fig4_20.c */
/* 1*/   main( void )
/* 2*/   {
/* 3*/       int Choice;
/* 4*/       double Area;

/* 5*/       while( 1 )
/* 6*/       {
/* 7*/           printf( "Enter %d for circle, ", Circle );
/* 8*/           printf( "Enter %d for rectangle, ", Rectangle );
/* 9*/           printf( "Enter %d for square: ", Square );

/*10*/           if( scanf( "%d", &Choice ) != 1 )
/*11*/               break;

/*12*/           if( Choice == Circle )
/*13*/               Area = ProcessCircle( );
/*14*/           else if( Choice == Square )
/*15*/               Area = ProcessSquare( );
/*16*/           else if( Choice == Rectangle )
/*17*/               Area = ProcessRectangle( );
/*18*/           else      /* Illegal Choice */
/*19*/               break;

/*20*/           if( Area < 0 )
/*21*/               break;
/*22*/           printf( "the area is %.2f\n", Area );
/*23*/       }
/*24*/   }