View Compilation Error

0_0_20880265_29903.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_20880265_29903.cpp: In function 'int main()':
0_0_20880265_29903.cpp:8:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n)&&n) 
                        ^
0_0_20880265_29903.cpp:9:27: error: 'printf' was not declared in this scope
         printf("%d\n",a[n]); 
                           ^