typedef关键字

#include <bits/stdc++.h>
using namespace std;
typedef char str;
str cha(str h){
    if(h >= 'a' and h <= 'w' or h >= 'A' and h <= 'W'){
        return (char)(h + 3);
    }else if(h >= 'x' and h <= 'z' or h >= 'X' and h <= 'Z'){
        return (char)(h - 23);
    }
}
str caps(str h){
    if(h >= 'A' and h <= 'Z'){
        return (char)(h + 32);
    }else{
        return (char)(h - 32);
    }
}
int main(){
    char k[1100], a[1100], b[1100];
    cin >> k;
    int len = strlen(k);
    for(int i = 0; i < len; i++){
        a[i] = cha(k[i]);
    }
    for(int i = len - 1; i >= 0; i--){
        b[len - i] = a[i];
    }
    for(int i = 1; i <= len; i++){
        cout << caps(b[i]);
    }
    return 0;
}