C ++迭代器iterator在string中使用方法介绍

//正向迭代器
void test1()
{
	string str1 = "abcdef";
	cout << "读取字符串：" << endl;
	string::iterator it1 = str1.begin();
	while (it1 != str1.end())
	{
		cout << *it1 << " ";
		it1++;
	}
	cout << endl;
	cout << "每个字母向后移动一位：" << endl;
	string::iterator it2 = str1.begin();
	while (it2 != str1.end())
	{
		*it2 +=1;
		cout << *it2 << " ";
		it2++;
	}
	cout << endl;
}

//只读正向迭代器
void test2()
{
	const string str1 = "abcdef";
	cout << "只能读取字符串：" << endl;
	string::const_iterator it1 = str1.begin();
	while (it1 != str1.end())
	{
		cout << *it1 << " ";
		it1++;
	}
	cout << endl;
}

//反向迭代器
void test3()
{
	string str1 = "abcdef";
	cout << "反向读取字符串：" << endl;
	string::reverse_iterator it1 = str1.rbegin();
	while (it1 != str1.rend())
	{
		*it1 += 1;
		cout << *it1 << " ";
		it1++;
	}
	cout << endl;
}

//反向迭代器(只读)
void test4()
{
	const string str1 = "abcdef";
	cout << "反向只读读取字符串：" << endl;
	string::const_reverse_iterator it1 = str1.rbegin();
	while (it1 != str1.rend())
	{
		cout << *it1 << " ";
		it1++;
	}
	cout << endl;
}

//auto
void test5()
{
	cout << "auto的演示" << endl;
	const string str1 = "abcdef";
	cout << "反向只读读取字符串：" << endl;
	auto it1 = str1.rbegin();
	while (it1 != str1.rend())
	{
		cout << *it1 << " ";
		it1++;
	}
	cout << endl;
}