如何判断字符串中是否包含英文字母？

[annywoody]

CString strTemp = "12A456";
CString strNum = "123456";

如何判断字符串中是否含有英文字母？？

[fox000002]

可以逐个字符判断

isalpha(strTemp[i])

[zzz822163]

用isalpha 逐个字母检查

#include <locale>
#include <iostream>

using namespace std;

int main( )   
{
   locale loc ( "German_Germany" );
   bool result1 = isalpha ( 'L', loc);
   bool result2 = isalpha ( '@', loc);
   bool result3 = isalpha ( '3', loc);

   if ( result1 )
      cout << "The character 'L' in the locale is "
           << "alphabetic." << endl;
   else
      cout << "The character 'L' in the locale is "
           << " not alphabetic." << endl;

   if ( result2 )
      cout << "The character '@' in the locale is "
           << "alphabetic." << endl;
   else
      cout << "The character '@' in the locale is "
           << " not alphabetic." << endl;

   if ( result3 )
      cout << "The character '3' in the locale is "
           << "alphabetic." << endl;
   else
      cout << "The character '3' in the locale is "
           << " not alphabetic." << endl;
}

[yuhudie203]

bool bflag = false;
int length = str.GetLength();
for(int i -= 0 ; i < length ; i++)
{
int num = str.GetAt(i);
if((num>='a'&&num<='z')||(num>='A'&&num<='Z'))
{
bflag = true;
break;
}
}
if(bflag == true)
MessageBox("此字符串含有英文字母");
else
MessageBox("此字符串不含有英文字母");

[yuhudie203]

上面for那句有个错误应该是(int i = 0; i <length ; i++)

[annywoody]

3#的方法想到了，还以为有什么更方便的方法呢
谢谢诸位了

[rookieme]

bool HaveAtChar(CString c_str)//如果c_str中有字母，返回TRUE,否则返回FALSE
{
int iLength=c_str.GetLength();
c_str.MakeUpper();
char *ptr=c_str.GetBuffer(0);
for(int i=0;i<iLength;i++)
{
if((*ptr>='A')&&(*ptr<='Z'))
return TRUE;
ptr++;
}
return FALSE;

}

[dxk01]

顶一下，有这么多方法了

[cnzdgs]

大家都没考虑汉字。

[用户 昵称]

一般都从前向后查找，如果要考虑中文的话，那最好用unicode。

[ccpaishi]

isalpha是判断是否是字母的最好办法。

[一条晚起的虫]

//只是代码短一点，效率未必高，未进行效率比较测试。
CString strTemp = "123A23";
CString str;
sscanf(strTemp, "%[^A-Za-z]", str);
if(str.GetLength() < strTemp.GetLength())
  MessageBox("含有字母");

[wmpkumse]

正则表达式？？？

[cofanz]

不用处理全角的吗？

[路人乙2019]

[Quote=引用 2 楼 zzz822163 的回复:]
用isalpha 逐个字母检查

C/C++ code
#include <locale>
#include <iostream>

using namespace std;

int main( )
{
locale loc ( "German_Germany" );
bool result1 = isalpha ( 'L', loc);
bool result2 = isalpha ( '@', loc);
bool result3 = isalpha ( '3', loc);

if ( result1 )
cout << "The character 'L' in the locale is "
<< "alphabetic." << endl;
el…
[/Quote]正解。