foo.cc: In function 'int main()':
foo.cc:10:5: error: 'cin' was not declared in this scope
     cin>>n;
     ^~~
foo.cc:10:5: note: suggested alternative: 'sin'
     cin>>n;
     ^~~
     sin
foo.cc:17:9: error: 'cout' was not declared in this scope
         cout<<n0<<" - "<<n1<<" = "<<n2<<endl; 
         ^~~~
foo.cc:17:9: note: suggested alternative: 'cosl'
         cout<<n0<<" - "<<n1<<" = "<<n2<<endl; 
         ^~~~
         cosl
foo.cc:17:41: error: 'endl' was not declared in this scope
         cout<<n0<<" - "<<n1<<" = "<<n2<<endl; 
                                         ^~~~
foo.cc:17:41: note: suggested alternative: 'ynl'
         cout<<n0<<" - "<<n1<<" = "<<n2<<endl; 
                                         ^~~~
                                         ynl

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