View Compilation Error

0_0_24803456_18184.cpp:1:1: error: 'include' does not name a type
 include<bits/stdc++.h>
 ^
0_0_24803456_18184.cpp: In function 'int main()':
0_0_24803456_18184.cpp:7:29: error: 'scanf' was not declared in this scope
 while(~scanf("lld%lld",&a,&b)){
                             ^
0_0_24803456_18184.cpp:8:29: error: 'printf' was not declared in this scope
      printf("%lld\n",(a+b)/2);
                             ^