View Compilation Error

0_0_35534220_19910.cpp: In function 'int main()':
0_0_35534220_19910.cpp:4:22: error: 'scanf' was not declared in this scope
  while(~scanf("%d",&n),n)
                      ^
0_0_35534220_19910.cpp:12:18: error: 'printf' was not declared in this scope
   printf("%d\n",x);
                  ^