C++容器入门（vector 内置自定义数据类型和auto简单练习）

二维数组的auto遍历格式

for (auto& aaa : newarr) {
			for (auto& aaakid : aaa)
				cout << aaakid << "   ";
			cout << endl;
		}

#include 
#include 
#include 
using namespace std;

void show(int val) {
	cout << val << endl;
}

class xinxi {
public:
	xinxi(string name, int age) {
		this->name = name;
		this->age = age;
	}
	string name;
	int age;
};

int main() {
	cout << "每个容器都有自己专属的迭代器" << endl;
	cout << "常用容器的迭代器都是双向和随机访问迭代器" << endl;
	vector  arr;
	//push_back尾插
	for (int i = 1; i <= 5; i++)
		arr.push_back(i * 10);
		vector  ::iterator begin = arr.begin();
		vector  ::iterator end = arr.end();
		while (begin != end)
			cout << *begin++ << endl;
		cout << endl;

		//头文件要包括algorithm
		for_each(arr.begin(), arr.end(),show);
		cout << endl;

		for (auto a : arr) {
			cout << a << endl;
		}

		vector  xinxibiao;
		xinxi x1("tom", 6);
		xinxi x2("jerry", 5);
		xinxibiao.push_back(x1);
		xinxibiao.push_back(x2);
		for (auto a : xinxibiao) {
			cout <<"姓名："< xinxibiao2;
		xinxi x3("tom", 7);
		xinxi x4("jerry", 6);
		xinxibiao2.push_back(&x3);
		xinxibiao2.push_back(&x4);
		for (auto aa : xinxibiao2) {
			cout << "姓名：" << (*aa).name << "年龄：" << (*aa).age << endl;
		}

		cout << "容器嵌套容器" << endl;
		vector > newarr;
		vector  kid1;
		for (int i = 0; i < 5; i++)
			kid1.push_back(i);
		vector  kid2;
		for (int i = 5; i < 10; i++)
			kid2.push_back(i);
		vector  kid3;
		for (int i = 10; i < 15; i++)
			kid3.push_back(i);
		newarr.push_back(kid1);
		newarr.push_back(kid2);
		newarr.push_back(kid3);
	
		//C++本质没有多维数组，只是一维数组的多次嵌套
		for (auto& aaa : newarr) {
			for (auto& aaakid : aaa)
				cout << aaakid << "   ";
			cout << endl;
		}
}