View Compilation Error

0_0_18181159_20148.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_18181159_20148.cpp: In function 'int main()':
0_0_18181159_20148.cpp:9:54: error: 'scanf' was not declared in this scope
     while(scanf("%d %d %d", &num[1], &num[2], &num[3]) && (num[1]||num[2]||num[3]))
                                                      ^
0_0_18181159_20148.cpp:42:33: error: 'printf' was not declared in this scope
                 printf("%d\n", i);
                                 ^
0_0_18181159_20148.cpp:46:29: error: 'printf' was not declared in this scope
             printf("%d\n", i);
                             ^