View Compilation Error

0_0_17923551_7200.cpp: In function 'int main()':
0_0_17923551_7200.cpp:23:13: error: expected initializer before 'scanf'
             scanf("%I64d",&a);
             ^
0_0_17923551_7200.cpp:25:16: error: 'a' was not declared in this scope
             if(a[i]%8==7)
                ^