第三节 练习9

#include<iostream>
#include<iomanip>
#include<cstdio>
#include<cmath>
#include<algorithm>
#include<cstring>
#include<typeinfo>
using namespace std;

int main()
{	
	char str[] = "GSOOWFASOq";
	const int len = strlen(str);
	char a[len]; //???为何 +7就没bug 
	
	for(int i=0;i<=len-1;i++){
		if(str[i] <=90){
			if(str[i] >=88){	//到了末尾3个字母，要回首 
				a[len-1-i] = (int)tolower(str[i]) - 23;
			}else{
				a[len-1-i] = (int)tolower(str[i]) + 3;
			}
		}else{
			if(str[i] >=120){	//到了末尾3个字母，要回首 
				a[len-1-i] = (int)toupper(str[i]) - 23;
			}else{
				a[len-1-i] = (int)toupper(str[i]) + 3;
			}
		}
	} 
	
	cout << a;
	/*char a[5] = "adsa";
	cout << int(a[4]);*/
}
//cout << "输入：";

结果：