lowercase.cpp

用于词法分析的词法分析器

/* $Id: lowercase.cpp,v 1.1 1996/07/30 11:40:48 matt Exp $

   lowercase ().

   Lowercase a C++ string. */

#include <ctype.h>
#include <std/string.h>

void lowercase (string &str)
{
  for (int i = str.length () - 1; i >= 0; i--)
  {
    char c = str [i];
    if (isupper (c))
      str [i] = c - 'A' + 'a';
  }
}