#include<iostream>
#include<string>
using namespace std;
int func1()
{
	return 10;
}
auto func2()
{
	return 100;
}
void func3(auto x) //error: 不允許使用auto做參數(shù)
{
}
int main()
{
	auto a = 10; //這里的auto=int
	auto* ra = &a; //auto=int
	auto rra = &a; //auto=int*
    auto b=3.14; //auto=char
    auto& rb=b;
    int ma = 10, mb = 30, mc = 90;
	auto md = 100, me = 200;
	auto ch = 'a', z = 10;//error,auto只對(duì)ch推導(dǎo)
	return 0;
}

void test01()
{
	int arr[10] = { 1,2,3,4,5 };
	for (auto& e : arr)
	{
		cout << e << " ";
	}
	cout << endl;
	char s[] = { "hello,world" };
	for (auto& ch : s)
	{
		cout << ch;
	}
	cout << endl;
	string str("hello world");
	for (auto ch : str)
	{
		cout << ch << " ";
	}
	cout << endl;
}
int main()
{
	test01();
	return 0;
}

void test02()
{
	string s1;
	cout << s1 << endl;
	string s2("A ship in harbor is safe, but that's not what ships are built for");
	cout << s2 << endl;
	string s3("hello world");
	cout << s3 << endl;
	string s4(10, 'x');
	cout << s4 << endl;
	string s5(s2);
	cout << s5 << endl;
}

void test03()
{
	string s1("hello world");
	s1.push_back(' ');
	s1.push_back('x');
	s1.push_back('i');
	s1.push_back('a');
	s1.push_back('o');
	s1.push_back('l');
	s1.push_back('i');
	cout << s1 << endl;
	s1.pop_back();
	cout << s1 << endl;
}

void test05()
{
	string s1("hello,xiaoli");
	//頭插
	s1.insert(0, 3, 'x');
	s1.insert(0, "excuse");
	//中間插入
	string s2("hi");
	s2.insert(1,3,'z');
	s2.insert(2, "hello");
	//尾插
	string s3("today");
	s3.insert(4, s2);
}

void test06()
{
	string s1("hello,xiaoli");
	s1.pop_back();
	s1.pop_back();
	s1.pop_back();
	cout << s1 << endl;
}

void test07()
{
	string s1("hello,xiaoli");
	s1.erase(0, 2);
	s1.erase(5, 3);
	string s2("hello,tomorror");
	string::iterator it = s2.begin();//迭代器
	s2.erase(it + 3, it + 5);
}

void test08()
{
	string s1("hello,xiaoli");
	s1.append(3, 'x');
	string s2("hello,tomorror");
	s2.append(" today");
    s2.append(s1);
}

void test09()
{
	string s1("hello,xiaoli");
	s1.assign("excuse me");
	cout << s1 << endl;
	string s2("hello,tomorror");
	s2.assign(s1);
	cout << s2 << endl;
}

//replace
void test10()
{
	string s1("hello,xiaoli");
	s1.replace(2, 3, 5,'x');//從下標(biāo)為2的位置開(kāi)始長(zhǎng)度為3個(gè)字符替換成5個(gè)x
	cout << s1 << endl; ////hexxxxx,xiaoli
	string s2("hello,tomorror");
	s2.replace(3, 5, "excuse"); //helexcusemorror
	cout << s2 << endl;
}

//find
void test11()
{
	string s1("hello,xiaoli");
	cout<<s1.find("llo")<<endl; //從下標(biāo)為0開(kāi)始找,返回2
	cout << s1.find("he",6)<< endl; //從下標(biāo)為6開(kāi)始找，返回18446744073709551615
	string s2("hello,tomorror");
	cout << s2.find(s1, 3) << endl; //返回18446744073709551615
}

//rfind
void test12()
{
	string s1("hello,xiaoli");
	cout << s1.rfind("llo") << endl; //從下標(biāo)為0開(kāi)始往前找
	cout << s1.rfind("he", 6) << endl; //從下標(biāo)為6開(kāi)始往前找
	string s2("hello,tomorror");
	cout << s2.rfind(s1, 3) << endl;
	string s3("hello,today,hello tomorror");
	cout<<s3.rfind("hello")<<endl; //12,匹配第二個(gè)hello
	cout<<s3.find("hello")<<endl; //0，匹配第一個(gè)hello
}

void test13()
{
	string s1("hello,xiaoli");
	cout << s1.size() << endl; //12
	string s2("hello,tomorror");
	cout << s2.size() << endl; //14
}

void test14()
{
	string s1("A ship in harbor is safe, but that's not what ships are built for");
	cout << s1.capacity() << endl; //79
	string s2("hello,tomorror");
	cout << s2.capacity() << endl; //15
}

void test13()
{
	string s1("hello,xiaoli");
	cout << s1.length() << endl; //12
	string s2("hello,tomorror");
	cout << s2.length() << endl; //14
}

void test15()
{
	string s1("A ship in harbor is safe, but that's not what ships are built for");
	s1.reserve(120);
	cout << s1.capacity() << endl;
	string s2("hello,tomorror");
	cout << s2.capacity() << endl;
	s2.reserve(10);
	cout << s2.capacity() << endl;
}

void test16()
{
	string s1("xiaoli");
	cout << s1.size() << endl;//6
	cout << s1.capacity() << endl;//15
	//s1.resize(20);
	//cout << s1.size() << endl; //20
	//s1.resize(12);
	//cout << s1.size() << endl; //12
	s1.resize(3);
	cout << s1.size() << endl; //3
    cout << s1.capacity() << endl; //15
}

void test17()
{
	string s1("xiaoli");
	cout << s1[2] << endl;
}

void test18()
{
	string s1("hello xiaoli");
	//遍歷方式
	// 下標(biāo) + []
	for (size_t i = 0; i < s1.size(); i++)
	{
		cout << s1[i] << " ";
	}
	cout << endl;
	// 迭代器
	string::iterator it = s1.begin(); //在模擬實(shí)現(xiàn)的時(shí)候具體講解
	while (it != s1.end())
	{
		(*it)++;
		cout << *it << " ";
		it++;
	}
	cout << endl;
	// 范圍for
	for (auto ch : s1)
	{
		ch--;
		cout << ch << " ";
	}
	cout << endl;
}

void test19()
{
	string s1("hello xiaoli");
	string s2("A ship in harbor is safe, but that's not what ships are built for");
	swap(s1, s2);
	cout << s1 << endl;
	cout << s2 << endl;
}

void test20()
{
	string s1("I Love you!");
	s1 = "hello,world";
	cout << s1 << endl;
    s1 = 'x';
	cout << s1 << endl;
}

void test21()
{
	string s1("I Love you!");
	s1 += "hello,world";
	cout << s1 << endl;
	s1 += ' x';
	cout << s1 << endl;
}

void test21()
{
	string s1("I Love you!");
	string s2("I love Code");

	cout << (s1 < s2) << endl;//注意優(yōu)先級(jí)關(guān)系
	cout << (s1 == s2) << endl;//注意優(yōu)先級(jí)關(guān)系
}

void test22()
{
	string str;
	cin >> str;  // 輸入 "Hello World"
	cout << str; // 輸出 "Hello"（只提取到第一個(gè)空格前的內(nèi)容）
}

void test23()
{
	string s;
	getline(cin, s);  // 輸入 "Hello World"
	cout << s;             // 輸出 "Hello World"（讀取整行內(nèi)容）
}

void test24()
{	
    string s1;
	getline(cin, s1, '#');  // 輸入 "Hello World"
	cout << s1;             // 輸出 "Hello World"（讀取整行內(nèi)容）
}

void test25()
{
	string s1("A ship in harbor is safe, but that's not what ships are built for");
	cout << s1.substr(3, 15) << endl;
	string s2 = s1.substr(5, 10);
	cout << s2 << endl;
}