View Compilation Error

0_0_35393608_23956.cpp:1:1: error: 'include' does not name a type
 include<stdio.h>
 ^
0_0_35393608_23956.cpp: In function 'int main()':
0_0_35393608_23956.cpp:18:18: error: 'scanf' was not declared in this scope
     scanf("%d",&N);
                  ^
0_0_35393608_23956.cpp:21:59: error: 'printf' was not declared in this scope
         printf("%.3lf\n",fabs(answer(x1,y1)-answer(x2,y2)));
                                                           ^