View Compilation Error

0_0_37237805_18170.cpp: In function 'int main()':
0_0_37237805_18170.cpp:4:27: error: 'scanf' was not declared in this scope
     while (~scanf("%d", &n))
                           ^
0_0_37237805_18170.cpp:19:25: error: 'printf' was not declared in this scope
         printf("%d\n", y);
                         ^