2）杨辉三角[1]队列实现

 1 #include<iostream>
 2 #include<iomanip>
 3 using namespace std;
 4
 5 enum error{overflow,underflow,success};
 6 const int maxlen=100;
 7
 8 class queue{
 9 public:
10     queue();
11     bool empty()const;
12     bool full()const;
13     int get_front(int &x)const;
14     error append(const int x);
15     error serve();
16 private:
17     int count;
18     int rear,front;
19     int data[maxlen];
20 };
21 queue::queue(){
22     count=0;
23     rear=front=0;
24 }
25
26 bool queue::empty()const{
27     if(count==0)return true;
28     return false;
29 }
30
31 bool queue::full()const{
32     if(count==maxlen)return true;
33     return false;
34 }
35
36 int queue::get_front(int &x)const{
37     if(empty())return underflow;
38     x=data[(front+1)%maxlen];
39     return success;
40 }
41 error queue::append(const int x){
42     if(full())return overflow;
43     rear=(rear+1)%maxlen;
44     data[rear]=x;
45     count++;
46     return success;
47 }
48
49 error queue::serve(){
50     if(empty())return underflow;
51     front=(front+1)%maxlen;
52     count--;
53     return success;
54 }
55
56 int main(){
57     queue q;
58     int n;
59     cin>>n;
60     int s1,s2;
61     for(int i=1;i<n;i++)cout<<"  ";
62     cout<<1<<endl;
63     q.append(1);
64     for(int i=2;i<=n;i++){
65         s1=0;
66         for(int k=1;k<=n-i;k++ )cout<<"  ";
67         for(int j=1;j<=i-1;j++){
68             q.get_front(s2);
69             q.serve();
70             cout<<s1+s2<<setw(4);
71             q.append(s1+s2);
72             s1=s2;
73         }
74         cout<<1<<endl;
75         q.append(1);
76     }
77     return 0;
78
79 }