C++学习(29)

 1 //异常处理的过程主要有三个步骤
 2 //抛出异常、捕捉异常和处理异常
 3 #include<iostream.h>
 4 
 5 class PushOnFull{
 6 };
 7 
 8 class PopOnEmpty{
 9 };
10 
11 class SeqStack{
12     private:
13         int *data;
14         int MaxStackSize;
15         int top;
16     public:
17         SeqStack(int n);
18         ~SeqStack();
19         
20         void Push(const int item);
21         int Pop();
22 };
23 
24 SeqStack::SeqStack(int n){
25     top=0;
26     MaxStackSize=n;
27     data=new int[n];
28 }
29 
30 SeqStack::~SeqStack(){
31     delete data;
32 }
33 
34 void SeqStack::Push(const int item){
35     if(this->top==this->MaxStackSize)
36         throw PushOnFull();//抛出异常
37     
38     data[top]=item;
39     top++;
40 }
41 
42 int SeqStack::Pop(){
43     if(top==-1){//这里有个疑问,top==-1还是top==0合适
44         throw PopOnEmpty();
45     }
46     top--;
47     return data[top];
48 }
49 
50 int main(){
51     SeqStack myStack(10);
52 //    try{
53 //        for(int i=0;i<11;i++){
54 //            myStack.Push(i);
55 //        }
56 //    }catch(PushOnFull){
57 //        cout<<"错误!堆栈已经满了"<<endl;
58 //    }
59     
60     try{
61         for(int i=0;i<11;i++){
62             cout<<myStack.Pop()<<endl;
63         }
64     }catch(PopOnEmpty){
65         cout<<"错误!堆栈已经空了"<<endl;
66     }
67     return 0;
68 }