[C++]vector遍历方式4种

#include<windows.h>
 #include<iostream>
 #include<vector>
 #include<iterator>
 #include<algorithm>
 using namespace std;
 int main(void)
 {
     vector<int> v1;
     for (int i = 0; i < 4; i++) v1.push_back(i);    //遍历容器的4种方法
    //1.普通for循环
     for (unsigned i = 0; i < v1.size(); i++) cout << v1[i] << " ";
     cout << endl;    vector<int>::iterator it = v1.begin();
     //2.使用迭代器的for循环
     for (it; it != v1.end(); it++) cout << *it << " ";
     cout << endl;    //3.基于范围的for循环
     for (int x : v1) cout << x << " ";
     cout << endl;    //4.使用for_each()函数和Lambda表达式
     for_each(v1.begin(), v1.end(), [](int x) {cout << x << " "; });
     cout << endl;    system("pause");
     return 0;
 }