下面程序的执行结果： class A{ public: long a; }; class B : public A { public: long b; }; void seta(A* data, int idx) { data[idx].a = 2; } int main(int argc, char *argv[]) { B data[4]; for(int i=0; i<4; ++i){ data[i].a = 1; data[i].b = 1; seta(data, i); } for(int i=0; i<4; ++i){ std::cout << data[i].a << data[i].b; } return 0; }

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