大写到小写字符串 [英] uppercase to lower case string
本文介绍了大写到小写字符串的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想用c ++将大写转换为小写.请提供请求的函数.
Hi i want to have code to convert uppercase to lowercase in c++.Please provide the requested function.
推荐答案
尝试以下操作:
Try this:
#include <ctype.h>
void stringtolower(char *input)
{
for(int i=0;input[i];i++)
input[i] = tolower(input[i]);
}
Thaddeus使用::tolower()
的答案对于基于普通ANSIchar
的字符串是可以的.
以下内容也适用于非ANSI字符集或基于wchar_t
的字符串:
Hi,
Thaddeus''s answer using::tolower()
is OK for plain ANSIchar
based strings.
The following works as well with non-ANSI character sets orwchar_t
based strings:
// Use with VC pre-2010 compilers
#include <string>
#include <locale>
#include <algorithm>
#include <iterator>
template <class C_type>
C_type CharLower(C_type in)
{
return std::tolower(in, std::locale());
}
template <typename S_type>
S_type ToLower(const S_type& str)
{
S_type out;
std::transform(str.begin(), str.end(), std::back_inserter(out), CharLower<S_type::value_type>);
return out;
}
或由于C ++ 0x部分实现而对于VC2010而言更简单:
or simpler for VC2010 because of C++0x partial implementation:
// Use with VC2010 compilers
#include <string>
#include <locale>
#include <algorithm>
#include <iterator>
template <typename S_type>
S_type ToLower(const S_type& in)
{
S_type out;
std::transform(in.begin(), in.end(), std::back_inserter(out), [](S_type::value_type ch){
return std::tolower(ch, std::locale());});
return out;
}
您可以使用以下命令测试这两个版本:
You can test both versions with:
#include <iostream>
int main ()
{
using namespace std;
string str="Test String.\n";
cout << ToLower(str) << endl;
wstring wstr= L"Test String.\n";
wcout << ToLower(wstr) << endl;
return 0;
}
欢呼声,
AR
cheers,
AR
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