有如下程序: #include<iostream> using namespace std; class Base { protected: in i; public: int j; }; class Derived:public Base { int m; public:int n; }; int main() { Derived d; d.i=0; //[1] d.j=0; //[2] d.m=0; //[3] d.n=0; //[4] retum 0; } 其中主函数中有两个赋值语句有错,这两个借误的赋值语句是