作为数据结构学校作业的一部分,我必须编写一个程序来实现Stack作为链表。以下是我写的代码。
使用链接列表实现堆栈的C ++程序
#include<iostream.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
/*
* Node Declaration
*/
struct node
{
char city[20];
struct node *link;
}*top;
/*
* Class Declaration
*/
class stack_list
{
public:
node *push(node *, char[20]);
node *pop(node *);
void traverse(node *);
stack_list()
{
top = NULL;
}
};
/*
* Main: Contains Menu
*/
int main()
{
int choice;
char item[20];
stack_list sl;
do
{
cout<<"\n-------------"<<endl;
cout<<"Operations on Stack"<<endl;
cout<<"\n-------------"<<endl;
cout<<"1.Push Element into the Stack"<<endl;
cout<<"2.Pop Element from the Stack"<<endl;
cout<<"3.Traverse the Stack"<<endl;
cout<<"4.Quit"<<endl;
cout<<"Enter your Choice: ";
cin>>choice;
switch(choice)
{
case 1:
cout<<"Enter value to be pushed into the stack: ";
gets(item);
top = sl.push(top, item);
break;
case 2:
top = sl.pop(top);
break;
case 3:
sl.traverse(top);
break;
case 4:
exit(1);
break;
default:
cout<<"Wrong Choice"<<endl;
}
} while(choice !=4);
return 0;
}
/*
* Push Element into the Stack
*/
node *stack_list::push(node *top, char city[20])
{
node *tmp=NULL;
tmp = new (struct node);
strcpy(tmp->city,city);
// tmp->city[20] =item[20];
tmp->link = top;
top = tmp;
return top;
}
/*
* Pop Element from the Stack
*/
node *stack_list::pop(node *top)
{
node *tmp;
if (top == NULL)
cout<<"Stack is Empty"<<endl;
else
{
tmp = top;
cout<<"Element Popped: "<<tmp->city<<endl;
top = top->link;
free(tmp);
}
return top;
}
/*
* Traversing the Stack
*/
void stack_list::traverse(node *top)
{
node *ptr;
ptr = top;
if (top == NULL)
cout<<"Stack is empty"<<endl;
else
{
cout<<"Stack elements :"<<endl;
while (ptr != NULL)
{
cout<<ptr->city[20]<<endl;
ptr = ptr->link;
}
}
}
以下程序在运行期间不显示推送的字符。 如果我推“德里”,我会被推,然后当我打电话给横向时,它没有显示被推动的成员。
答案 0 :(得分:2)
这一行错了:
cout<<ptr->city[20]<<endl;
您需要使用:
cout<<ptr->city<<endl;
建议更改stack_list
不要使用全局top
,而是在类中创建成员变量top
。然后,您可以简化成员函数。他们不再需要node*
作为输入。
class stack_list
{
public:
node *push(char[20]);
node *pop();
void traverse();
stack_list()
{
top = NULL;
}
private:
node* top;
};
相应地更改实施。