A.if elseend;for end;switch case end;while end; B.if elseend;switch case end;for end;while end; C.for end;if else end;while end;switch case end; D.while end;for end;switch case end;if else end;
A.a=4,b=4,c=2.0000i B.a=4,b=2.0000i,c=2.0000i C.a=2.0000i,b=4,c=2.0000i D.a=2.0000i,b=2.0000i,c=2.0000i