A.a.operator++() B.operator++(a) C.operalor++(a,l) D.operator++(1,a)
A.AB(){a=0} B.AB(intaa=0);a(aa){} C.AB(intaa):a(aa){} D.AB(){}
A.帶參構(gòu)造函數(shù) B.無(wú)參構(gòu)造函數(shù) C.拷貝構(gòu)造函數(shù) D.賦值重載函數(shù)