下面程序的结果是 #include<iostream.h> class A { int a; public: A():a(1){} void showa(){cout<<a;} }; class B { int a; public: B():a(2){} void showa(){cout<<a;} }; class C:public A,public B { int a; public: C():a(3) ㈠ voidshowa(){cout<<a;} }; voidmain() { C c; c.showa(); }