View Compilation Error

0_0_17555215_18854.cpp: In function 'int main()':
0_0_17555215_18854.cpp:13:19: error: expected initializer before 'a'
   unsigned _int64 a[4];
                   ^
0_0_17555215_18854.cpp:16:19: error: 'a' was not declared in this scope
    scanf("%I64d",&a[i]);
                   ^
0_0_17555215_18854.cpp:18:8: error: 'a' was not declared in this scope
   sort(a,a+4);
        ^