执行代码后段错误
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAXSIZE 20
typedef char ElemType;
typedef struct Stack
{
ElemType top;
ElemType base;
int Stacksize;
}Stack,StackLink;
//初始化一个栈
void InitalStack(StackLink S)
{
S->base=(ElemType)malloc(MAXSIZEsizeof(ElemType));
if(S->base==NULL)
printf("创建错误\n");
S->base=S->top;
S->Stacksize=MAXSIZE;
}
void Pop(StackLink S,ElemType e)
{
if(S->base==S->top)
printf("栈为空,出栈错误\n");
else
{
e=--S->top;
}
}
void Push(StackLink S,ElemType e)
{
if(S->top-S->base==MAXSIZE)
printf("入栈错误\n");
else
{
*S->top++=e;
}
}
//判断空栈
int StackEmpty(StackLink S)
{
return(S->base==S->top);
}
int IsPlalindrome(ElemType *a)
{
StackLink S;
ElemType e;
InitalStack(S);
int len,i;
len=strlen(a);
//入栈
for(i=0;i<len/2;i++)
{
Push(S,a[i]);
}
//回文数的长度为奇数
if(len%2==1)
i++;
//将剩余的字符与栈中的字符进行比较,相同则出栈
while(!StackEmpty(S))
{
Pop(S,e);
if(e==a[i])
i++;
else
return 0;
}
return 1;
}
int main()
{
char a[MAXSIZE];
gets(a);
if(IsPlalindrome(a))
printf("YES\n");
else
printf("No\n");
return 0;
}