Kaprekar numbers: Difference between revisions

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@@ Line 64: / Line 64: @@
 #include <iostream>
 #include <sstream>
-#include <cstdlib>
 #include <algorithm>
 #include <iterator>
 #include <utility>
-std::pair<std::string, std::string> splitString( const std::string & s ,
+long string2long( const std::string & s ) {
+   long result ;
-      int pos ) {
-   return std::make_pair( s.substr( 0 , pos ) , s.substr( pos ) ) ;
+   std::istringstream( s ) >> result ;
+   return result ;
 }
@@ Line 80: / Line 80: @@
    std::string numberstring = numberbuf.str( ) ;
    for ( int i = 0 ; i < numberstring.length( ) ; i++ ) {
-      std::pair<std::string, std::string> stringparts =
+      std::string firstpart = numberstring.substr( 0 , i ) ,
+                  secondpart = numberstring.substr( i ) ;
-	 splitString( numberstring , i ) ;
       //we do not accept figures ending in a sequence of zeroes
-      if ( stringparts.second.find_first_not_of( "0" ) == std::string::npos ) {
+      if ( secondpart.find_first_not_of( "0" ) == std::string::npos ) {
 	 return false ;
       }
-      if ( atol( stringparts.first.c_str( ) )
+      if ( string2long( firstpart ) + string2long( secondpart ) == number ) {
-	    + atol( stringparts.second.c_str( )) == number ) {
 	 return true ;
       }