View Compilation Error

0_0_36329587_8724.cpp:1:1: error: expected unqualified-id before 'for'
 for(int i=0;i<(1<<n);i++)
 ^
0_0_36329587_8724.cpp:1:13: error: 'i' does not name a type
 for(int i=0;i<(1<<n);i++)
             ^
0_0_36329587_8724.cpp:1:22: error: 'i' does not name a type
 for(int i=0;i<(1<<n);i++)
                      ^