C++ 输入一个英文字符串(一句话)，统计输入的单词个数

#include <iostream>
#include <string>
#include <windows.h>
using namespace std;
int main() {
    string line;
    int i = 0;  //访问字符数组的下标
    int count = 0;

    cout << "请输入一句话：";
    getline(cin,line);

    while (line[i] == ' ') i++;  //跳过前面的连续空格
    while (line[i]) {     //while(line[i] != '0')
        while (line[i] && line[i] != ' ') i++;  //跳过连续的多个非空格组合(单词)
        while (line[i] == ' ') i++;
        count++;
    }

    cout << "一共有" << count << "个单词" << endl;

    system("pause");
    return 0;
}