这是我的回文的程序，可以运行，但出不来结果，希望那个高手指点哈，谢谢大家了！

#include <stdio.h>
#define N 20
#define ERROR -1
#define TRUE 1
typedef struct
{char elem[N];
int top[2];
}seqstack;
 int main()
 {int i,j,m,n;
  seqstack *s;
  char c;
  printf(" please input the num of the first sequence :\n");
  scanf("%d",&n);
  for( i=1;i<=n;i++)
  {printf("please input the characters:\n");
   c=getchar();
   if(c='&') continue;
   s->elem[s->top[0]]=c;
    s->top[0]++;
  }
  
   printf("input the nem of the second sequence:");
   scanf("%d",&m);
   if( m!=n) return(-1);
   if( m+n>=N) return(-1);
   for(j=1;j<=m;j++)
   {printf(" please input the characters:");
    c=getchar();
    if(c='&') continue;
    s->top[1]--;
    s->elem[s->top[1]]=c;
   }
   while (s->top[0]!=0&&s->top[1]!=0)
   {
   {while(s->elem[s->top[0]]==s->elem[s->top[1]])
   {s->top[0]--;
    s->top[1]++;
   }
    return(1 );
   }

   }
 }