13、vector容量和大小

#include <iostream>
#include <vector>

using namespace std;

void printvector (vector<int>& v)
{
    for (vector<int>::iterator it = v.begin(); it != v.end(); it ++)
    {
        cout << *it << " ";
    }

    cout << endl;
}

void test01 ()
{
    vector<int> v1;

    for (int i = 0; i < 10; i ++)
    {
        v1.push_back(i);
    }

    printvector(v1);

    if (v1.empty())
    {
        cout << "v1 is empty" << endl;
    }
    else
    {
        cout << "v1 is not empty" << endl;

        cout << "v1's capacity is " << v1.capacity() << endl;
        cout << "v1's size is " << v1.size() << endl;
    }

    //重新指定大小
    v1.resize(16, 100);    //利用重载的版本，可以指定默认填充值，参数2
    printvector(v1);    //如果重新指定的比原来长，默认用0填充

    v1.resize(5);
    printvector(v1);    //超出部分被截取
}

int main ()
{
    test01();

    return 0;
}