vector模板类之简单程序代码(初始化、迭代器、大小、容量以及删除等操作)

本文通过一个C++示例程序详细介绍了std::vector容器的基本使用方法，包括如何初始化、添加元素、删除元素，以及如何获取容器的大小和容量等。此外还展示了如何调整容器的大小并填充默认值。

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#include<iostream>
#include<string>
#include<vector>
using namespace std;
void main()
{
	vector<string>myvt;
	myvt.reserve(4);//预先设置容器的大小
	myvt.push_back("1.Beijing City.");
	myvt.push_back("2.Tianjin City.");
	myvt.push_back("3.Chengdu City.");
	myvt.push_back("4.Chongqing City.");
	cout << "OK!" << endl;

	vector<string>::iterator it;
	for (it = myvt.begin(); it != myvt.end(); it++)
	{
		cout << *it << endl;
	}
	// 
	it = myvt.erase(myvt.begin()+2, myvt.end()-1);

	for (it = myvt.begin(); it != myvt.end(); it++)
	{
		cout << *it << endl;
	}
	//获取容器的大小和容量
	int m = myvt.size();
	int n = myvt.capacity();
	int m1 = myvt.max_size();//获取容器的最大容量
	cout << "vector:myvt,size is " << m << endl;
	cout << "vector:myvt,capacity is " << n << endl;
	cout << "vector:myvt,maxsize is " << m1 << endl;

	//重置大小
	myvt.resize(10);
	cout << "resize: 10." << endl;
	int n1 = myvt.capacity();
	int n2 = myvt.size();
	cout << "vector:myvt,size is " << n2 << endl;
	cout << "vector:myvt,capacity is " << n1 << endl;

	for (it = myvt.begin(); it != myvt.end(); it++)
	{
		if (*it == "")
		{
			cout << "******" << endl;
		}
		else
		{
			cout << *it << endl;
		}
	}
	cin.get();
}