vector

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {


	// 默认构造函数 
	vector<int> v1;

	// 带参数的构造函数，指定容量大小
	// 里边的元素都是初始值：0
	// 构造时就分配空间，同时插入元素
	vector<float> v2(10);
	// 构造时，指定空间大小，并且插入的元素的值都是 666
	vector<float> v3(10, 666);

	// 进行元素拷贝
	vector<float> v4(v3.begin(), v3.end());


	// 通过数组来构造
	// 后面的值，表示边界，即从0开始取值，取几个
	int arr[] = { 1,6, 2,3 };
	vector<float> v5(arr, arr+2);

	v1.push_back(1);
	v1.push_back(2);
	v1.push_back(3);
	v1.push_back(4);
	v1.push_back(5);
	v1.push_back(6);

	cout << "v1.size()=" << v1.size() << endl;
	cout << "v1 容器大小=" << v1.capacity() << endl;
	cout << "v2.size()=" << v2.size() << endl;

	for (unsigned int i = 0; i < v1.size(); i++)
	{
		cout << "v1[" << i << "]=" << v1[i] << endl;
	}

	cout << "==================================" << endl;

	for (unsigned int i = 0; i < v2.size(); i++)
	{
		cout << "v2[" << i << "]=" << v2[i] << endl;
	}

	cout << "==================================" << endl;

	for (unsigned int i = 0; i < v3.size(); i++)
	{
		cout << "v3[" << i << "]=" << v3[i] << endl;
	}

	cout << "==================================" << endl;

	for (unsigned int i = 0; i < v4.size(); i++)
	{
		cout << "v4[" << i << "]=" << v4[i] << endl;
	}

	cout << "==================================" << endl;

	for (unsigned int i = 0; i < v5.size(); i++)
	{
		cout << "v5[" << i << "]=" << v5[i] << endl;
	}
	return 0;
}

赋值

	v3[1] = 11; // 第一种
	// 第二种
	v3.assign(2, 66);

	cout << "==================================" << endl;
	for (unsigned int i = 0; i < v3.size(); i++)
	{
		cout << "v3[" << i << "]=" << v3[i] << endl;
	}

为空

empty()

....

函数的使用不再记录