不知道哪里出现了问题，求解答

Question

https://img-mid.csdnimg.cn/release/static/image/mid/ask/068910024536149.jpg

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Answer 1

char get(char ch)
{
    if(ch>='a'&&ch<='z')
    {
        ch+=4;
        if(ch>'z')
            ch=ch-'z'+'a'-1;
    }
    else
    {
        if(ch>'Z')
            ch=ch-'Z'+'A'-1;
    }
    return ch; 
}