#include<bits/stdc++.h> using namespace std; int main(){ char c; //cin >>c; // cin无法输入空格 scanf("%c", &c);// 可以输入空格， if(c-1 >= 32 && c-1 <= 126){ cout << c-1 <<endl; } else{ cout << "Input Error!" <<endl; } if(c+1 >= 32 && c+1 <= 126){ cout << c+1 <<endl; } else{ cout << "Input Error!" <<endl; } return 0; }