c++ linux 判断string是中文的 or 英文的 字符串。

#include <iostream>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
using namespace std;
/***linux下一个中文占用三个字节,windows占两个字节***/
void chinese_or_english(char *str)
{
  char chinese[] = {};
  for (int i = ; i < strlen(str); i++) {
    //if (str[i] >= 0 && str[i] <= 127) {      //ascII
    if ((str[i] & 0x80) == ) {   //chinese:the top is 1
      cout<<"alpha:"<<str[i]<<endl;
    }
    //else if (str[i] < 0){
    else {
      chinese[] = str[i];
      chinese[] = str[i + ];
      chinese[] = str[i + ];
      i++;    //skip one more
      i++;
      printf("chinese:%s\n", chinese);
    }
  }
}
int main()
{
  char str[] = "tai太阳yang";
  cout<<strlen(str)<<endl;
  chinese_or_english(str);
  return ;
}

判断占用字节数。

int SVPSettingKeyboard::chinese_or_english(std::string str,int index)
{
    if(index > str.size()-)
        return ;
    if((str[index-]& 0x80) == ){
        return ;
    }else{
        int n = ;
        while(((str[index-n] &0x80) == 0x80 )&&((str[index-n] &0x40) == )){
            ++n;
        }
        return n;
    }
}