View Compilation Error

0_0_23957469_6104.c: In function 'main':
0_0_23957469_6104.c:28:9: error: 'i1' undeclared (first use in this function)
    for (i1=0;i1<b[i] ;i1++ )
         ^
0_0_23957469_6104.c:28:9: note: each undeclared identifier is reported only once for each function it appears in