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我正在寫一個C++代碼來實現模板隊列,但是當我運行我的代碼時,出現錯誤的結果,而不是預期的結果,這裏是頭文件和主代碼。模板隊列出錯結果
queue.h
#include <iostream>
#pragma once
using namespace std;
typedef int Error_code;
#define SUCCESS 0
#define OVERFLOW -1
#define UNDERFLOW -2
template <class T>
class Node{
public:
T item;
Node * next;
Node(){item=0; next=NULL;}
Node(T n){item=n; next=NULL;}
};
template <class T>
class queue
{
protected:
Node *front, *rear;
int count;
public:
queue(){
cout<<"constructor \n";
count = 0;
front = rear = NULL;};
~queue(){Node<T> * p;
while(front != NULL)
{
p = front;
front = front->next;
delete p;
}};
bool isempty(){
//return count == 0;
if(front==NULL)
return true;
else
return false;
};
bool isfull(){return false;};
Error_code serve(){
Error_code outcome = SUCCESS;
Node<T> *p;
if(isempty()){
cout<<"empty queue\n";
outcome=UNDERFLOW;
}
else{
p=front;
front=front->next;
delete p;
count--;
}
return outcome;
} ;
Error_code retrieve(T &item){
Error_code outcome= SUCCESS;
if(isempty())
{ // front node is empty, queue is empty
//return false;
cout<<"empty queue\n";
outcome=UNDERFLOW;
}
return outcome;
};
Error_code append(T item){
Node<T> * n ;
n= new Node; // create node
n->item = item; // set node pointers
n->next = NULL;
if (isempty())
{
rear=front = n;
}
else
{
rear->next = n; // else place at rear
rear = n; // have rear point to new node
}
count++;
return SUCCESS;
};
};
的main.cpp
#include "queue.h"
#include <iostream>
using namespace std;
int main()
{
queue<int> q;
queue<char> q2;
int x;
char y;
cout<<"the fisrt queue is :";
q.isempty()?cout<<"empty \n\n":cout<<"not empty \n\n";
cout<<"the second queue is :";
q2.isempty()?cout<<"empty \n\n":cout<<"not empty \n\n";
q.append(2);
q.append(3);
q.append(4);
q2.append('a');
q2.append('b');
q2.append('c');
q.retrieve(x);
cout<<x<<endl;
q.serve();
q.retrieve(x);
cout<<x<<endl;
q.serve();
q.retrieve(x);
cout<<x<<endl;
q.serve();
q2.retrieve(y);
cout<<y<<endl;
q2.serve();
q2.retrieve(y);
cout<<y<<endl;
q2.serve();
q2.retrieve(y);
cout<<y<<endl;
q2.serve();
q.retrieve(x);
q2.retrieve(y);
system("pause");
return 0;
}
我得到這些結果:
構造
構造
第一個隊列爲:空
第二隊列是:空
-858993460
-858993460
-858993460
然後它打印一些符號
空隊列
空隊列
使用調試程序遍歷代碼,並親自查看出錯的位置。 – NPE
同樣,缺少模板參數:'Node * front,* rear;''> Node,* back;' - 'n = new Node;' - >'n = new Node;'和 –
dyp
@NPE我該怎麼做? 以及它是如何有用,讓我知道它爲什麼會產生錯誤的結果 –