C++ String to array

Comments

• semler9k

  August 2010

  [code]for(std::string::reverse_iterator rit = org.rbegin(); rit != org.rend(); ++rit) {
  end += *rit;
  }
  [/code]
  
  This uses the reverse iterator of the string class to iterate backwards through the collection and appends each character to the new string.
  
• semler9k

  August 2010

  BTW: Your compile problems is due to the fact that the compiler needs to know the size of the array when compiling. Otherwise you have to allocate the array dynamically using new (c++) or malloc (c)
  
  [code]
  char* reversal = new char [num];
  [/code]
  
• pistolizedpete

  August 2010

  Thanks for all your help.
  
  Pete.
• bilderbikkel

  August 2010

  See http://richelbilderbeek.nl/CppReverseString.htm
  
  
• HK_MP5KPDW

  August 2010

  [code]std::string ReverseString(const std::string& s)
  {
  std::string t;
  std::copy(s.rbegin(),s.rend(),std::back_inserter(t));
  return t;
  }[/code]
  Can be rewritten simply as:
  [code]std::string ReverseString(const std::string& s)
  {
  return std::string(s.rbegin(),s.rend());
  }[/code]
  ...and, put that way, it almost doesn't even seem to deserve its own function.
• HK_MP5KPDW

  August 2010

  [code]char* reversal = new char [num[b][color=Blue]+1[/color][/b]];[/code]
  Don't forget a C-style string (null terminated char array) needs that extra bit of space for the null terminating character. If it doesn't have a null it really isn't a "string" but rather simply a char array.
  
  ...and remember to always [italic]delete[/italic] what you [italic]new[/italic].
• bilderbikkel

  August 2010

  : ...and, put that way, it almost doesn't even seem to deserve its own
  : function.
  I purposefully post 'trivial' code on my website (http://richelbilderbeek.nl/CppWhyTrivialCode.htm): the beginner finds what he/she is looking for. The more advanced programmers use the one-line equivalent in his/her code directly.
  
  
  
• bilderbikkel

  August 2010

  P.S. I put your shorter version on my site and thanked you for it: http://richelbilderbeek.nl/CppReverseString.htm
  
  If you would not mind...
  
  Thanks, Bilderbikkel
• hero_hont

  August 2010

  i want know loop return... how does it work??
  if we dom't use it, how do this code do?
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• hero_hont

  August 2010

  i want know loop return... how does it work??
  if we dom't use it, how do this code do?
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