栈的实现,括号匹配
一、栈的概念与特点
一种特殊的线性表,它的插入和删除运算均在同一端进行。这一端被称为栈顶,另一端为栈底,插入称为进栈,删除称为出栈。有后进先出的性质。栈顶top相当于顺序表中的size,即元素个数。关于顺序表可以参考数据结构(一)——顺序表及实现 。
[注]没有a[n]这个元素。n是元素的数量
二、栈的操作及实现
1、结构体定义
2、初始化
3、判断是否为空
4、取得栈顶值
5、入栈操作
6、出栈操作
7、打印栈的内容
1、结构体定义
- #define LENGTH 100
- #include<stdio.h>
- #include<stdlib.h>
- typedef char datatype;
- typedef struct sequence_stack{
- datatype data[LENGTH];
- int top;
- }sequence_stack;
2、初始化
- #include"stack.h"
- void init_sequence_stack(sequence_stack *st){
- st->top = 0;
- }
3、判断是否为空
- #include"stack.h"
- int is_empty_sequence_stack(sequence_stack *st){
- return (st->top? 0:1);
- }
4、取得栈顶值
- #include"stack.h"
- datatype get_top(sequence_stack *st){
- if(st->top == 0){
- printf("the stack is empty!\n");
- exit(1);
- }else{
- return st->data[st->top-1];
- }
- }
5、入栈操作
- #include"stack.h"
- void push(sequence_stack *st,datatype x){
- if(st->top == LENGTH){
- printf("the stack is full!\n");
- exit(1);
- }else{
- st->data[st->top] = x;
- st->top++;
- }
- }
6、出栈操作
- #include"stack.h"
- datatype pop(sequence_stack *st){
- if(st->top==0){
- printf("the stack is empty!\n");
- exit(1);
- }else{
- st->top--;
- return st->data[st->top];
- }
- }
7、打印栈的内容
- #include"stack.h"
- void display_sequcence_stack(sequence_stack *st){
- if(st->top == 0){
- printf("the stack is empty!\n");
- exit(1);
- }else{
- int i;
- for(i = 0;i<st->top;i++){
- printf("%c ",st->data[i]);
- }
- }
- }
三、栈的应用举例
括号匹配:检验表达式中的括号是否匹配
- #include<stdio.h>
- #include"stack.h"
- void compare(sequence_stack *,datatype);
- int main(){
- datatype data='\0';
- printf("Please input the express: ");
- sequence_stack Mystack;
- sequence_stack *stack=&Mystack;
- init_sequence_stack(stack);
- while((data=getchar()) != '\n'){
- switch(data){
- case '{':
- case '[':
- case '(':
- push(stack,data);
- break;
- case '}':
- compare(stack,'{');
- break;
- case ']':
- compare(stack,'[');
- break;
- case ')':
- compare(stack,'(');
- break;
- defult : break;
- }
- }
- if(is_empty_sequence_stack(stack)){
- printf("The bracket compare!\n");
- }else {
- printf("The bracket doesn't compare!\n");
- }
- return 0;
- }
- void compare(sequence_stack *stack,datatype data){
- if(get_top(stack) != data){
- printf("The bracket doesn't compare!\n");
- exit(0);
- }else
- pop(stack);
- }
调试运行:
- [[email protected] stack]$ gcc `ls stack*` bracket_match.c -o bracket_match -g
- [[email protected] stack]$ ./bracket_match
- Please input the express: abc{1[2(3)]4}aaa
- The bracket compare!
- [[email protected] stack]$ ./bracket_match
- Please input the express: {s(s{}s]s}
- The bracket doesn't compare!
- [[email protected] stack]$ ./bracket_match
- Please input the express: { [ ( ] ) }
- The bracket doesn't compare!
- [[email protected] stack]$
本篇博客出自 阿修罗道,转载请注明出处: http://blog.****.net/fansongy/article/details/6784919