View Compilation Error

0_0_34766892_30713.cpp:16:9: error: 'maxn' was not declared in this scope
 char ch[maxn];
         ^
0_0_34766892_30713.cpp: In function 'int main()':
0_0_34766892_30713.cpp:19:24: error: 'ch' was not declared in this scope
     while(~scanf("%s", ch)){
                        ^
0_0_34766892_30713.cpp:24:27: error: 'll' was not declared in this scope
             ans = (int)(((ll)ans * 10 + ch[i] - '0') % x);
                           ^
0_0_34766892_30713.cpp:24:30: error: expected ')' before 'ans'
             ans = (int)(((ll)ans * 10 + ch[i] - '0') % x);
                              ^
0_0_34766892_30713.cpp:24:58: error: expected ')' before ';' token
             ans = (int)(((ll)ans * 10 + ch[i] - '0') % x);
                                                          ^