View Compilation Error

0_0_13148349_23150.c: In function 'main':
0_0_13148349_23150.c:14:16: error: 'a' undeclared (first use in this function)
    scanf("%d",&a[i]);
                ^
0_0_13148349_23150.c:14:16: note: each undeclared identifier is reported only once for each function it appears in