请问，为什么全是RE呢？ 输入为3 a都不行

jiangtaooo @ 2020-03-07 20:20:06

#include<iostream>
using namespace std;
int main()
{
    int n,i = 0;
    char a[50],s;
    cin >> n;
    cin >> s;
    while (s != '\n')
    {
        a[i] = s;
        cout << char(a[i++] + n);
        cin >> s;
    }
}

by jiangtaooo @ 2020-03-07 20:45:57

@Dimly_dust 谢谢。

by jiangtaooo @ 2020-03-07 20:46:16

@liqingyang 谢谢你。

by liqingyang @ 2020-03-07 20:48:18

@我什么不会呀_ 不客气

by Dimly_dust @ 2020-03-07 20:59:48

@我什么不会呀_ 不客气