foo.cc: In function 'int main()':
foo.cc:9:2: error: expected ';' before 'b'
  b=x/100%10
  ^
foo.cc:12:8: error: 's' was not declared in this scope
  cout<<s;
        ^
foo.cc:5:8: warning: unused variable 'a' [-Wunused-variable]
  int x,a,b,c,d;
        ^
foo.cc:5:10: warning: unused variable 'b' [-Wunused-variable]
  int x,a,b,c,d;
          ^

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