foo.cc: In function 'int main()':
foo.cc:6:9: error: 'cin' was not declared in this scope
    6 |         cin>>x>>ch;
      |         ^~~
foo.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
  +++ |+#include <iostream>
    1 | using namespace std;
foo.cc:8:21: error: 'ceil' was not declared in this scope
    8 |                 m=8+ceil((x-1000)/500.0)*4;
      |                     ^~~~
foo.cc:13:9: error: 'cout' was not declared in this scope
   13 |         cout<<m<<endl;
      |         ^~~~
foo.cc:13:9: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
foo.cc:13:18: error: 'endl' was not declared in this scope
   13 |         cout<<m<<endl;
      |                  ^~~~
foo.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; did you forget to '#include <ostream>'?
  +++ |+#include <ostream>
    1 | using namespace std;

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