[Dev-C++] question about Sets

[chea s. o. <y2k...@ya...>]

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inline bool lt_nocase(char c1, char c2) { return
tolower(c1) < tolower(c2); }


int main()
{
  
  char A3[] = {'a'};
  char A4[] = {'a','b'};

 
  const int N3 = sizeof(A3);
  const int N4 = sizeof(A4);

cout<< "Union of A3 and A4: ";
cout<<"{" ;
  set_union(A3, A3 + N3, A4, A4 + N4,
ostream_iterator<char>(cout,", "),lt_nocase);
  cout<<"}"<<endl;
  cout << endl;
  system("pause");
}
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do anyone of u have use the algo function b4? 
i need to do union and intercept at the same time 
just like """Au(BnC)""" 

may i know how can i combile both oeprator 2gether? 


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