View Compilation Error

0_0_17829501_7827.cpp:1:1: error: 'include' does not name a type
 include <cstdio>  
 ^
0_0_17829501_7827.cpp: In function 'int main()':
0_0_17829501_7827.cpp:26:32: error: 'scanf' was not declared in this scope
     int T, n, x; scanf("%d", &T);  
                                ^
0_0_17829501_7827.cpp:31:36: error: 'puts' was not declared in this scope
         puts(ans ? "Carol" : "Dave");  
                                    ^