A、double Area(double r) { double s; s = 3.14*r*r; return s; }
B、void Area(double r) { double s; s = 3.14*r*r; return s; }
C、double Area( ) { double s; s = 3.14*r*r; return s; }
D、double Area(double r) { Area = 3.14*r*r; }
A、int x = fun( );
B、float x = fun( );
C、double x = fun( );
D、double x = function( );
A、int y = fun( '5' );
B、int y = fun( 5 );
C、int x = fun( fun(5) );
D、int x = fun( "5" );
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