数据结构上机3栈-括号匹配

#include <stdio.h>
#include <malloc.h>
#define OK              1
#define OVERFLOW       -1
#define ERROR           0
#define STACK_INIT_SIZE 100
#define STACKINCREMENT  10
typedef char SElemType;
typedef int Status;

typedef struct{
    SElemType  * base;
    SElemType  * top;
    int          stacksize;
}SqStack;
///////////////////////初始化栈
Status InitStack_Sq(SqStack * S){
    S->base = (SElemType *)malloc(STACK_INIT_SIZE * sizeof(SElemType));
    if(!S)
        exit(OVERFLOW);
    S->top = S->base;
    S->stacksize = STACK_INIT_SIZE;
    return OK;
}
///////////////////////栈是否为空
Status EmptyStack(SqStack * S){
    if(S->top == S->base)
        return OK;
}
///////////////////////栈置空
Status ClearStack(SqStack * S){
    S->top = S->base;
    return OK;
}
///////////////////////压栈
Status Push(SqStack * S, SElemType e){
    if(S->top - S->base >= S->stacksize){
        S->base = (SElemType *)realloc(S->base, (S->stacksize + STACKINCREMENT) * sizeof(SElemType));
        if(!S->base)
            exit(OVERFLOW);
        S->top = S->top + S->stacksize;
        S->stacksize += STACKINCREMENT;
    }
    *S->top++ = e;
    return OK;
}
///////////////////////出栈
Status Pop(SqStack *S, SElemType * e){
    if(S->top == S->base)
        return ERROR;
    *e = * --S->top;
    return OK;
}

/************************************************************
 *          匹配括号()[]                                     *
 * 1. 初始化栈->栈是否为空(不是空栈则置空)                      *
 * 2. 遍历字符串                                             *
 *     a.([压栈 b.)]匹配栈顶出栈 c.不匹配为多余 d.其他字符跳过   *
 * 3.匹配结束  输出栈中内容                                   *
 *                                                         *
 ************************************************************/
void  brackets(char * ch){
    SqStack S;
    SElemType e, *p;
    int i = 0, j=1;

    if(!InitStack_Sq(&S))
        puts("初始化失败
");
    if(EmptyStack(&S))
        printf("
匹配前:
    栈为空
");
    else
        ClearStack(&S);

    printf("
开始匹配:
");
    while(ch[i]){
        if(ch[i]== '[' || ch[i] == '('){
            Push(&S, ch[i++]);
            continue;
        }
        p = S.top-1;
        if(EmptyStack(&S)!=OK)
            if(*p == ch[i]-2 || *p == ch[i]-1){
                 Pop(&S, &e);
                 printf("%3d 第%3d个字符 %c 与栈顶 %c 匹配
", j++, ++i, ch[i], e);
                continue;
            }
        if(ch[i] == ']' || ch[i] == ')'){
            printf("%3d 第%3d个字符 %c 无匹配值
", j++, ++i, ch[i]);
            continue;
        }
        i++;
    }

    p = S.top;
    if(EmptyStack(&S)!=OK){
        printf("
匹配后:
    栈中还剩下:
");
        while (p--!=S.base)
            printf("%c ", *p);
    }
    else
        printf("
匹配后:
    栈为空,匹配成功");
}

int main(void){
    char ch[50];

    puts("请输入字符串: ");
    gets(ch);
    brackets(ch);
    printf("
");
    return 0;
}