例题3-3回文词镜像词

#include<cstring>
#include<cmath>
#include<cstdio>
#include<cstdlib>
#include<algorithm>
#include<ctime>
#include<ctype.h>
using namespace std;
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)
{
    if(isalpha(ch))retrurn rev[ch-'A'];
    else 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/2;i++)
        {
            if(s[i]!=s[len-i-1])p=0;
            if(r(s[i])!=s[len-1-i])m=0;
        }
        printf("%s -- is %s.\n\n",s, msg[m*2+p]);
    }
    return 0;
}

如果ch是大写字母，则ch-‘A’就是它在字母表中的序号，类似的如果是数字，则ch-‘0’就是这个数字的数值本身。