031.判断字符串是否回文

#include <stdio.h>
#define MAX 50
int cycle(char *s)
{
  char *h,*t;
  for(h=s,t=s+strlen(s)-1;t>h;h++,t--)
    if(*h!=*t) break;
  return t<=h;
}
main()
{
  char s[MAX];
  clrscr();
  while(1)
  {
    puts("Please input the string you want to judge (input ^ to quit):");
    scanf("%s",s);
    if(s[0]=='^')
      break;
    if(cycle(s))
      printf(" %s is a cycle string.\n",s);
    else
      printf(" %s is not a cycle string.\n",s);
  }
  puts("\nThank you for your using,bye bye!\n");
}