View Compilation Error

0_0_34107220_27372.cpp:3:1: error: expected unqualified-id before 'for'
 for(int i=3;i<1010;i++) f[i]=2*f[i-1]+f[i-2];
 ^
0_0_34107220_27372.cpp:3:13: error: 'i' does not name a type
 for(int i=3;i<1010;i++) f[i]=2*f[i-1]+f[i-2];
             ^
0_0_34107220_27372.cpp:3:20: error: 'i' does not name a type
 for(int i=3;i<1010;i++) f[i]=2*f[i-1]+f[i-2];
                    ^