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Convert cases of strings

Two functions, used to convert c++ strings from upper case to lowercase and vice versa. Each takes a string argument, and returns the converted string. Please note that parameters should be validated before passing them to the functions.

Submitted By: Amadeus
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Views: 42,483

Language: C++
Last Modified: February 25, 2005
Instructions: Include either the ctype.h OR cctype libraries, as well as the stdlib.h as part of the preprocessor directives.

Snippet


  1. string StringToUpper(string strToConvert)
  2. {//change each element of the string to upper case
  3.    for(unsigned int i=0;i<strToConvert.length();i++)
  4.    {
  5.       strToConvert[i] = toupper(strToConvert[i]);
  6.    }
  7.    return strToConvert;//return the converted string
  8. }
  9.  
  10. string StringToLower(string strToConvert)
  11. {//change each element of the string to lower case
  12.    for(unsigned int i=0;i<strToConvert.length();i++)
  13.    {
  14.       strToConvert[i] = tolower(strToConvert[i]);
  15.    }
  16.    return strToConvert;//return the converted string
  17. }

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Comments


jeronimo0d0a 2008-05-07 08:28:38

With most character sets you can set strToConvert -= 'a' - 'A' ; // to lower strToConvert += 'a' - 'A' ; // to upper without the overhead of a function call. I realize that this is less portable, but portability is not an issue for some.
Amadeus 2008-05-07 10:32:21

Very true sir! :) It is, however, an issue for me. Of course, a simple call to the std::transform() algorithm would be just as easy. An example: http://forums.devx.com/showthread.php?t=83058

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