foo.cc:1:1: error: 'include' does not name a type; did you mean '__has_include'?
 include <iostream>
 ^~~~~~~
 __has_include
foo.cc: In function 'int main()':
foo.cc:6:5: error: 'cin' was not declared in this scope
     cin>>a>>b>>c;
     ^~~
foo.cc:6:5: note: suggested alternative: 'main'
     cin>>a>>b>>c;
     ^~~
     main
foo.cc:16:5: error: 'cout' was not declared in this scope
     cout<<max;
     ^~~~

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