若有以下程序： #include ＜iostream＞ using namespace std; class Aprivate: int a; public: void seta(int x) a=x; void showa() cout＜＜a＜＜","; ; class Bprivate: int b; public: void setb(int x) b=x; void showb() cout＜＜b＜＜","; ; class C: public A, private Bprivate: int c; public: void setc(int x, int y, int z) c=z; seta(x); setb(y); void showc() showa(); showb(); cout＜＜c＜＜end1; ; int main() C c; c.setc(1,2,3); c.showc(); return 0;程序执行后的输出结果是( )。