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栈的原理:
先进后出原则!!!
1、限定仅在表尾进行插入或删除操作的线性表
2、栈顶:表尾端3、栈底:表头端
4、应用:数制转换,行编辑程序,树的遍历等
5、凡是对数据的处理具有“后进先出(LIFO)”的特点,都可以用栈这种数据结构来操作
demo:用链表实现栈!
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
struct Link
{
int data;
struct Link* next;
};
struct Stack
{
struct Link* head;
int size;
};
void StackInit(struct Stack* stack)
{
stack->head = NULL;
stack->size = 0;
}
void StackPush(struct Stack* stack, const int data)//进栈
{
struct Link* node;
node = (struct Link*)malloc(sizeof(struct Link));
assert(node != NULL);
node->data = data;
node->next = stack->head;
stack->head = node;
++stack->size;
}
int StackEmpty(struct Stack* stack)
{
return (stack->size == 0);
}
int StackPop(struct Stack* stack, int* data)//出栈
{
if (StackEmpty(stack))
{
return 0;
}
struct Link* tmp = stack->head;
*data = stack->head->data;
stack->head = stack->head->next;
free(tmp);
--stack->size;
return 1;
}
void StackCleanup(struct Stack* stack)
{
struct Link* tmp;
while (stack->head)
{
tmp = stack->head;
stack->head = stack->head->next;
free(tmp);
}
stack->size = 0;
}
int main(void)
{
struct Stack stack;
StackInit(&stack);
int i;
for (i=0; i<5; i++)
{
StackPush(&stack, i);
}
while (!StackEmpty(&stack))
{
StackPop(&stack, &i);
printf("%d ", i);
}
printf("\n");
return 0;
}