View Compilation Error

0_0_32867745_2845.cpp:1:1: error: expected unqualified-id before 'for'
 for(int i = 0,id = 0;i < len;i ++){
 ^
0_0_32867745_2845.cpp:1:22: error: 'i' does not name a type
 for(int i = 0,id = 0;i < len;i ++){
                      ^
0_0_32867745_2845.cpp:1:30: error: 'i' does not name a type
 for(int i = 0,id = 0;i < len;i ++){
                              ^