View Compilation Error

0_0_26561986_21284.cpp:3:1: error: 'include' does not name a type
 include<stdio.h>
 ^
0_0_26561986_21284.cpp: In function 'int main()':
0_0_26561986_21284.cpp:25:25: error: 'f' was not declared in this scope
   printf("%.0lf\n",f(2,x));
                         ^