大写转化为小写

[RocheFoo]

输入：任一字符串12sfdA45
输出：12sfda45
功能：把字符串中的大写字符转化为小写。
要求：代码不超过10行。
大家写写看吧

[freeCodeSunny]

#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main()
{
for(string s;getline(in, s);)
{
int len;
len=s.length();
for(int i=0;i<len;i++)
{
if(s[i]>='A'&&s[i]<='Z')s[i]+=32;
cout<<s[i];
}
cout<<endl;
}
return 0;
}

[allenlinhao]

#include<iostream>
#include<string>
using namespace std;
int main()
{
string sentense;
cin>>sentense;
for(int i=0;i<sizeof(sentense);i++)


if(sentense[i]>='a'&&sentense[i]<='z')
{
sentense[i]=toupper(sentense[i]);
cout<<sentense[i];
}
else if(sentense[i]>='A'&&sentense[i]<='Z')
{
sentense[i]=tolower(sentense[i]);
cout<<sentense[i];
}



else
cout<<sentense[i];
}

[heartgoon2010]

#include<iostream>
#include<string>
using namespace std;
int main()
{
string s="12sfdA45";
for(string::size_type index=0;index!=s.size();index++)
if(isupper(s[index])) s[index]=tolower(s[index]);
return 0;
}

[Sayesailor]

#include <assert.h>
#include <tchar.h>
#include <memory>

//be careful release the pointer returned
TCHAR* lowcase(const TCHAR* pStr)
{
    size_t strlen = _tcslen(pStr) + 1;
    TCHAR* pDest = new TCHAR[strlen];
    memset(pDest, 0, strlen);
    _tcscpy_s(pDest, strlen, pStr);
    _tcslwr_s(pDest, strlen);
    return pDest;
}

const TCHAR* str = _T("This iS a pEn, that is A penCile); 

int _tmain(int argc, _TCHAR* argv[])
{
    TCHAR* p = lowcase(str);
    delete p;
    p = NULL;
	return 0;
}

[futurepi]

来凑个热闹

[tomatobin]

char *s;
while(*s)
{
   if(isalpha(*is)) *s=tolower(*s);
   s++;
}
cout<<s<<endl;

[孙歌]

string str;
cin>>str;
transform(str.begin(),str.end(),str.begin(),tolower );
cout<<str;

[hkping420]

#include<iostream.h>
#include<string.h>
void main()
{
int n;
cout<<"请输入字符的长度：";
cin>>n;
char *p=new char[n];
cout<<"请输入字符串：";
for(int i=0;i<n;i++)
cin>>char(p[i]);
cout<<"转换后的字符串："<<strlwr(p)<<endl;
delete p;
}

[wang1525]

我是来学习滴

[碎碎念]

[Quote=引用 1 楼 ckt1120 的回复:]

C/C++ code

void Change(char* pStr)
{
while ((*pStr) != '\0'){
if ((*pStr)>='A' && (*pStr)<='Z'){
*pStr += 32;
}
pStr++;
}
}
[/Quote]

++

[greex]

std::string strTmp ="12sfdA45ddsfA";
char * pBuff = new char[strTmp.size()];
memset(pBuff,0,10);
memcpy(pBuff,strTmp.c_str(),strTmp.size());
strlwr(pBuff);
strTmp =pBuff;
delete []pBuff;
pBuff = 0;
std::cout<<strTmp<<std::endl;

[vxking]

stl能用就用啊

[kingbigeast]

#include <cctype>
void up2lower(char *a)
{
while(*a++)
    if(isupper(*a))tolower(*a);//也可以不用这个if判断语句，因为*a不是大写字母的话tolower不改变它的值
return 0;
}

[Freedom]

[Quote=引用 17 楼 pyf123 的回复:]
C/C++ code

#include<iostream>
#include<string>
using namespace std;
int main()
{
string str;
cin>>str;
for(string::size_type i=0;i<str.size();++i)
str[i]=toupper(str[i])……
[/Quote]
我也是这么做的就不想其他方法了

[qqwqert001]

这个应该很简单吧
if （isupper(str[i]))
cout<<tolower(str[i]);

[willabc]

3楼的不错！

[yequnanren]

void str_up_2_low(char *pszSrc, char *pszDest)
{
if (!pszSrc || !*pszSrc || !pszDest)
{
return;
}

do
{
*pszDest++ = ('A' <= *pszSrc && *pszSrc <= 'Z') ? (*pszSrc - 'A' + 'a') : *pszSrc;
}while (*++pszSrc)

return;
}

void str_low_2_up(char *pszSrc, char *pszDest)
{
if (!pszSrc || !*pszSrc || !pszDest)
{
return;
}

do
{
*pszDest++ = ('a' <= *pszSrc && *pszSrc <= 'z') ? (*pszSrc - 'a' + 'A') : *pszSrc;
}while (*++pszSrc)

return;
}

[Afterwards_]

[Quote=引用 15 楼 的回复:]

C/C++ code

char *mytolower(char *p)
{
char *p2 = p;
for (; *p2; p2++)
*p2 = *p2 >= 'A' && *p2 <= 'Z' ?
*p2 + 'a' - 'A' :
*p2 ;
……
[/Quote]

15楼GOOD

[Afterwards_]

同样不错[Quote=引用 12 楼 的回复:]

C/C++ code

char *mytolower(char *upp)
{
for (; *upp; upp++)
*upp = *upp >= 'A' && *upp <= 'Z' ?
*upp + 'a' - 'A' :
*upp ;
retur……
[/Quote]

[可见一斑]

transform(istream_iterator<char>(cin), istream_iterator<char>(), ostream_iterator<char>(cout, ""), ::tolower);

一行解决问题