使用链表实现栈操作

源码如下：

#include <stdio.h>
#include <stdlib.h>
struct node
{int info;struct node *link;
};
struct node *top = NULL, *temp;
void push(struct node *);
void pop(struct node *);
void display(struct node *);int main()
{int x = 0, item;printf("\t****stack using linked list****\n");while (x != 4){printf("\n1. Push\n2. Pop\n3. Display\n4. Exit\n");printf("Enter your choice: ");scanf("%d", &x);switch (x){case 1:push(top);break;case 2:pop(top);break;case 3:display(top);break;case 4:return 0;}}
}void push(struct node *p)
{int item;struct node *temp;temp = (struct node *)malloc(sizeof(struct node));printf("\nEnter element to be inserted: ");scanf("%d", &item);temp->info = item;temp->link = top;top = temp;printf("Inserted succesfully.\n");
}void pop(struct node *p)
{int item;struct node *temp;if (top == NULL)printf("\nStack is empty.\n");else{item = top->info;temp = top;top = top->link;free(temp);printf("\nElement popped is %d.\n", item);}
}void display(struct node *p)
{if (top == NULL)printf("\nStack is empty.\n");else{printf("\nElements in the stack are:\n");while (p != NULL){printf("\t%d\n", p->info);p = p->link;}// printf("%d\n",p->info);}
}

测试运行：

****stack using linked list****

1. Push
2. Pop
3. Display
4. Exit
Enter your choice: 1

Enter element to be inserted: 88 //入栈
Inserted succesfully.

1. Push
2. Pop
3. Display
4. Exit
Enter your choice: 3

Elements in the stack are:
88

1. Push
2. Pop
3. Display
4. Exit
Enter your choice: 1

Enter element to be inserted: 22 //入栈
Inserted succesfully.

1. Push
2. Pop
3. Display
4. Exit
Enter your choice: 3

Elements in the stack are:
22
88

1. Push
2. Pop
3. Display
4. Exit
Enter your choice: 2

Element popped is 22. //出栈