/in/foo.cc: In function 'void Prepare()':
/in/foo.cc:10:22: error: 'memset' was not declared in this scope
  memset(f,0,sizeof(f));
                      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:38:3: error: expected ';' before 'Prepare'
   Prepare();
   ^~~~~~~