View Compilation Error

0_0_15352312_23639.cpp: In function 'int main()':
0_0_15352312_23639.cpp:6:45: error: 'scanf' was not declared in this scope
  while(~scanf("%lld%lld%lld%lld",&h,&a,&b,&k))
                                             ^
0_0_15352312_23639.cpp:16:32: error: 'printf' was not declared in this scope
    printf("Case #%lld: YES\n",c);
                                ^
0_0_15352312_23639.cpp:21:31: error: 'printf' was not declared in this scope
    printf("Case #%lld: NO\n",c);
                               ^