View Compilation Error

0_0_31418241_1706.cpp: In function 'int main()':
0_0_31418241_1706.cpp:11:28: error: 'a' was not declared in this scope
             scanf("%I64d",&a[i]);
                            ^
0_0_31418241_1706.cpp:13:30: error: 'a' was not declared in this scope
             printf("%I64d\n",a[0]);
                              ^