foo.cc:1:2: error: "1nclude" after # is not a positive integer
 #1nclude <iostream>
  ^~~~~~~
foo.cc: In function 'int main()':
foo.cc:6:2: error: 'cin' was not declared in this scope
  cin>>a;
  ^~~
foo.cc:6:2: note: suggested alternative: 'main'
  cin>>a;
  ^~~
  main
foo.cc:10:2: error: 'cout' was not declared in this scope
  cout<<z*100+y*10+x;
  ^~~~

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