Question

ostream& operator<<(ostream&os,Seqstack &S) //操作重载

ostream& operator<<(ostream&os,Seqstack &S) //操作重载
{
os<<"top="<<S.top<<endl;
for (int i=0;i<=S.top;i++)
os<<i<<":"<<S.elements[i] <<endl;
return os;
}
error:
error C2065: 'S' : undeclared identifier
D:\jingyao_Tree\Seqstack.cpp(63) : error C2228: left of '.top' must have class/struct/union type
D:\jingyao_Tree\Seqstack.cpp(64) : error C2228: left of '.top' must have class/struct/union type
D:\jingyao_Tree\Seqstack.cpp(65) : error C2228: left of '.elements' must have class/struct/union type

Answer 1

S不是类，结构体，联合。

追问

class SeqsStack
{
private:
T *elements; //栈元素存放数组
int top; //栈顶指针
int maxsize; //栈最大容量
void overflowProcess(); //栈的溢出处理
public: Seqstack(int sz=50);
~Seqstack(){delete []elements;}
。。。。。。。。
friend ostream &operator<<(ostream &os,Seqstack &S);
};

追答

类名不能识别，如果是类定义和实现分离，记得加上头文件

追问

我加了头文件了，对不起啊，我已经查出是哪里的问题了。