a009: 解碼器 FYI: https://yunlinsong.blogspot.com/2016/01/blog-post_30.html

a009.cpp

#include <iostream>

using namespace std;

int main()
{
    int k = -7;
    char ch;

    while( cin.get(ch) )
    {
        if( ch != '\n' )
            ch = ch + k;
        cout << ch;
    }
    return 0;
}