下面程序的结果为 #include<iostream.h> int c; class A { private: int a; static int b; public: A( ) {a=0;c=0;} void seta( ){a++;} void setb( ){b++;} void setc( ){c++;} void display( ) {cout << a << ' ' << b << ' ' << C;} }; int A: :b=0; void main( ) { A a1,a2; a1.seta( ); a1.setb( ); a1.setc( ); a2.seta( ); a2.setb( ); a2.setc( ); a2.display( ); }