反转字符串 特殊做法

#include <string>
#include <iostream>

int main()
{
	std::string s = "I love you";

	int i = 0, j = s.size() - 1;

	while(i < j)
	{
		s[i] = s[i] + s[j];
		s[j] = s[i] - s[j];
		s[i] = s[i] - s[j];
		i++;
		j--;
	}

	std::cout << s << std::endl;
	return 0;

}