含中文字符串的处理程序

//这个程序用来统计一个包含有英文和中文字符串中的字符的个数，以及得到串中的某个字符

 

#include <iostream>
#include <string>
using namespace std;

/*the following program stastic the total number of the string*/
int main ()
{
    string str = "我是一个中国人，我爱我的祖国和人民，helloword!";
    int count = 0;
    for (int i = 0; i < str.size(); i++)
    {
        if (str[i] < 0)
        {
            count++; // 中文字的最高位为1，则小于0，那么向前连续两位

            i++;
        }
        else
            count++;
    }
    cout << "the total number of characters is: " << count << endl;
    cout << "the total length of the string is: " << str.length() << endl;
    /*找出字符串中第i个字符*/
    int index = 25;
    int temp = 0;
    int j;
    int step = 0; /*每次递增的步长*/
    for (j = 0; j <= str.size() && temp < index; j++)
    {
        if (str[j] < 0)
        {
            temp++;
            j++;
            step = 2;
        }
        else
        {
            temp++;
            step = 1;
        }
    }
    cout << "j = " << j << endl;
    string subStr = str.substr(j -step,step);
    cout << "the " << index << "character is: " << subStr << endl;
    return 0;
}