Vector容器的插入和删除

Vector容器 是一个单口容器

vector<int> v(arr, arr + sizeof(arr) / sizeof(int));

v.insert(v.begin(),100);  //头部插入元素

v.push_back(100); //尾插法

int val = v.pop_back();//删除

v.erase(v.begin());//指定位置删除

v.erase(v.begin(),v.end()); //区间删除

//vector容器的插入和删除
void test04(){
	
	int arr[] = { 6, 8, 3, 9 };
	vector<int> v(arr, arr + sizeof(arr) / sizeof(int));
	v.insert(v.begin(),100);  //头部插入元素

	v.push_back(100); //尾插法

	vector<int>::iterator pStart = v.begin();
	vector<int>::iterator pEnd = v.end();

	while (pStart != pEnd){
		cout << *pStart << " ";
		pStart++;
	}
	cout << endl;

	//删除
	int val = v.back();
	cout << val << "被删除" << endl;
	v.pop_back();

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

	//指定位置删除
	v.erase(v.begin());

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

	//区间删除
	//v.erase(v.begin(),v.end());
	v.clear();
	cout << "size:" << v.size() << endl;

}