View Compilation Error

0_0_33279049_5761.c: In function 'main':
0_0_33279049_5761.c:10:13: error: 'f' undeclared (first use in this function)
             f[1] = 2;
             ^
0_0_33279049_5761.c:10:13: note: each undeclared identifier is reported only once for each function it appears in