例题：回文词（UVa401）

#include<stdio.h>
#include<string.h>
#include<ctype.h>

const char* rev = "A   3  HIL JM O   2TUVWXY51SE Z  8 ";
const char* msg[] = { "not a palindrome", "a regular palindrome", "a mirrored string", "a mirrored palindrome" };

char r(char ch)  //判断字符是数字还是字母
{
if (isalpha(ch)) return rev[ch - 'A'];
return rev[ch - '0' + 25];
}

int main()
{
char s[30];
while (scanf("%s", s) == 1)
{
int len = strlen(s);
int p = 1, m = 1;
for (int i = 0; i < (len + 1) / 2; i++)
{
if (s[i] != s[len - 1 - i])p = 0;//不是回文串
if (r(s[i] != s[len - 1 - i]))m = 0;//不是镜像串
}
printf("%s -- id %s.\n\n", s, msg[m * 2 + p]);

}

}