用C语言编写输入一个小写字母输出该字母的前驱和后继字符

Question

前驱字母等于原来前驱字
后继字母等于原来后继字母

Answer 1

#include <iostream>
using namespace std;
int main()
{
    char ch,pre,next;
    cin >> ch;
    if(ch >= 'a' && ch <= 'z')
    {
        pre = ch -1;
        next = ch +1;
        cout << pre << "," << next <<endl;
    }else
        cout << "error" << endl;
    
    return 0;
}