算典03

算典03

原题

WERTYU

A common typing error is to place the hands on the keyboard one row to the right of the correct position. So “Q” is typed as “W” and “J” is typed as “K” and so on. You are to decode a message typed in this manner.

Input

Input consists of several lines of text. Each line may contain digits, spaces, upper case letters (except Q, A, Z), or punctuation shown above [except back-quote (`)]. Keys labelled with words [Tab, BackSp, Control, etc.] are not represented in the input.

Output

You are to replace each letter or punctuation symbol by the one immediately to its left on the QWERTY keyboard shown above. Spaces in the input should be echoed in the output.

Sample Input

O S, GOMR YPFSU/

Sample Output

I AM FINE TODAY.

题解

每个字符输出键盘上在其前面的字符
注意’\’ 应该是 ‘\\’(转义字符)
使用常量数组建立对应关系
使用fgets()输入带空格的字符串 (不推荐gets())

#include <cstdio>
#include <cstring>
#include <iostream>
using namespace std;
const int maxn = 1e4;char buf[maxn];
char arr[] = { "`1234567890-=QWERTYUIOP[]\\ASDFGHJKL;'ZXCVBNM,./"};char find(int id){for (int i = 0; i < strlen(arr); ++i){if (buf[id] == arr[i]){return arr[i - 1];}}
}int main(){while (fgets(buf, maxn, stdin)){int len = strlen(buf);for (int i = 0; i < len-1; ++i){if (buf[i] != ' '){buf[i] = find(i);}printf("%c", buf[i]);}printf("\n");}return 0;
}