string+迭代器

int main(){
string s0;
string s1("hello word");
cout<<s1<<endl;
//遍历string,下标+[]
for(size_t i=0;i<s1.size();i++)
{
cout<<s1[i]<<"";
}
cout<<endl;
}

注意：这里size_t不算/0

迭代器

int main()
{
	string s0;
	string s1("hello world");

	cout << s1 << endl;

	// 遍历string
	cout << s1.size() << endl;

	for (size_t i = 0; i < s1.size(); i++)
	{
		s1[i]++;
	}
	cout << endl;

	s1[0]--;
	// 下标+[]
	for (size_t i = 0; i < s1.size(); i++)
	{
		cout << s1[i]<<" ";
	}
	cout << endl;

	char s3[] = "hello world";
	s3[1]++; // -> *(s3+1)
	s1[1]++; // s1.operator[](1);

	// 迭代器
	string::iterator it = s1.begin();
	while (it != s1.end())
	{
		// 写
		(*it)--;

		++it;
	}
	cout << endl;

	it = s1.begin();
	while (it != s1.end())
	{
		// 读
		cout << *it << " ";
		++it;
	}
	cout << endl;