View Compilation Error

0_0_31090799_20552.cpp: In function 'int main()':
0_0_31090799_20552.cpp:4:15: error: 'scanf' was not declared in this scope
  scanf("%d",&n);
               ^
0_0_31090799_20552.cpp:9:22: error: 'printf' was not declared in this scope
          printf("1\n");
                      ^
0_0_31090799_20552.cpp:12:27: error: 'printf' was not declared in this scope
               printf("0\n"); 
                           ^
0_0_31090799_20552.cpp:14:30: error: 'printf' was not declared in this scope
                  printf("1\n"); 
                              ^
0_0_31090799_20552.cpp:22:58: error: 'printf' was not declared in this scope
                                printf("%.0lf\n",sum1/sum2); 
                                                          ^