View Compilation Error

0_0_18384705_29264.cpp:13:32: error: expected unqualified-id before 'for'
 #define FOR(i, f_start, f_end) for(int i = f_start; i <= f_end; i++)
                                ^
0_0_18384705_29264.cpp:20:1: note: in expansion of macro 'FOR'
 FOR(i, 0, 50)
 ^
0_0_18384705_29264.cpp:20:5: error: 'i' does not name a type
 FOR(i, 0, 50)
     ^
0_0_18384705_29264.cpp:13:53: note: in definition of macro 'FOR'
 #define FOR(i, f_start, f_end) for(int i = f_start; i <= f_end; i++)
                                                     ^
0_0_18384705_29264.cpp:20:5: error: 'i' does not name a type
 FOR(i, 0, 50)
     ^
0_0_18384705_29264.cpp:13:65: note: in definition of macro 'FOR'
 #define FOR(i, f_start, f_end) for(int i = f_start; i <= f_end; i++)
                                                                 ^