使用 C++ 中的堆栈反转链表
链表动态分配内存,用于实现堆栈。本程序展示了在 c++ 编程中反转链表。在这里,考生可以采用以下方法来获得预期结果。算法如下;
算法
START Step 1: create an empty stack of type node pointer Step 2: Traverse the list and push all of its nodes onto a stack Step 4: Traverse the list from the head node again Step 5: pop a value from the stack top step 6: connect them in reverse order Step 7: PRINT STOP
基于上述算法,起草了以下 c++ 代码,其中stdlib 库文件发挥了关键作用,提供了如下堆栈相关关键方法;
示例
#include <iostream>
#include <stdlib.h>
using namespace std;
struct linked_list {
int data;
struct linked_list *next;
};
int stack[30], top = -1;
struct linked_list* head = NULL;
int printfromstack(int stack[]) {
cout<<"\nStack after Reversal::";
while(top>=0) {
cout<<stack[top--]<<" ";
}
}
int push(struct linked_list** head, int n) {
struct linked_list* newnode = (struct linked_list*)malloc(sizeof(struct linked_list));
newnode->data = n;
newnode->next = (*head);
(*head) = newnode;
}
int intostack(struct linked_list* head) {
cout<<"Linked list::";
while(head!=NULL) {
printf("%d ", head->data);
stack[++top] = head->data;
head = head->next;
}
}
int main(int argc, char const *argv[]) {
push(&head, 7);
push(&head, 20);
push(&head, 3);
push(&head, 40);
intostack(head);
printfromstack(stack);
return 0;
}如以上代码所示,所有字符串操作代码被捆绑到retrieveChar() 方法中,之后,该调用被传递给程序主() 执行。
输出
Linked list:: 40 3 20 7 Stack after Reversal::7 20 3 40
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