易错点

#include<iostream>
#include<string>
using namespace std;
int main(){
    int n;
    string str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    cin>>n;
    for(int i=n%26 /*防止 n>26, 溢出*/ ;i<26;i++)
        cout<<str[i];
    for(int i=0;i<n%26 /*同上*/ ;i++)
        cout<<str[i];
    return 0;
}

求 ----------------------------------------------------------.|.