【cpp】Vector

这vector 很有用

// compile with: /EHsc
#include <vector>
#include <iostream>  

int main()
{
    using namespace std;
    vector<int> v1, v2, v3;  

    v1.push_back(10);
    v1.push_back(20);
    v1.push_back(30);
    v1.push_back(40);
    v1.push_back(50);  

    cout << "v1 = ";
    for (auto& v : v1){
        cout << v << " ";
    }
    cout << endl;  

    v2.assign(v1.begin(), v1.end());
    cout << "v2 = ";
    for (auto& v : v2){  //这个auto，应该是自动识别类型的意思，参见http://blog.csdn.net/huang_xw/article/details/8760403
        cout << v << " ";
    }
    cout << endl;  

    v3.assign(7, 4);
    cout << "v3 = ";
    for (auto& v : v3){
        cout << v << " ";
    }
    cout << endl;  

    v3.assign({ 5, 6, 7 });  //注意这里的大括号
    for (auto& v : v3){
        cout << v << " ";
    }
    cout << endl;
}