View Compilation Error

0_0_26013402_20634.cpp: In function 'int main()':
0_0_26013402_20634.cpp:9:44: error: 'a' was not declared in this scope
     for(int i = 0; i < n; i++) scanf("%d", a+i);
                                            ^
0_0_26013402_20634.cpp:10:10: error: 'a' was not declared in this scope
     sort(a, a+n);
          ^