View Compilation Error

0_0_13352431_3554.cpp:1:2: error: expected unqualified-id before 'for'
  for (i=2;i<=100000;i++)    //1处
  ^
0_0_13352431_3554.cpp:1:11: error: 'i' does not name a type
  for (i=2;i<=100000;i++)    //1处
           ^
0_0_13352431_3554.cpp:1:21: error: 'i' does not name a type
  for (i=2;i<=100000;i++)    //1处
                     ^