Example of String Searching

   string strA = "This is a whole sentence.";
   string strB = "is";
   int loc;

   // search for all occurrences of strB in strA
   loc = strA.find(strB);
   while ( loc != string::npos ) {
      cout << '"' << strB << "\" found at location "
           << loc << endl;
      loc = strA.find(strB,loc + strB.length());
   }

   string cset("aew");  // search set
   loc = strA.find_first_of(cset); // value is 8 = position of first 'a'

   loc = strA.find_first_of("ewa");       // value is 8 = posn of first 'a'
   loc = strA.find_first_of("ewa",0,2);   // value is 10 = posn of first 'w'
   loc = strA.find_first_of("ewa",0,1);   // value is 14 = posn of first 'e'
   loc = strA.find_first_of("ewa",0,10);  // value is 4 =  posn of first ' '