String 用法 简单API

明天天梯赛选拔，怕不是STl忘到姥姥家去了，赶紧复习一下

构造str

	string s = "fuckyouRMA";
	string s1(s, 2); de(s1);
	string s2(s, 2, 5); de(s2);
	char s3 []= "fuck";
	string s33(s3); de(s33);
	string s4(4, 'c'); de(s4);
	string s5(s.begin(), s.end() - 2); de(s5);
	//这样就可以灵活切割string了
	/*
	s1 ckyouRMA
	s2 ckyou
	s33 fuck
	s4 cccc
	s5 fuckyouR
	*/

操作函数

swap
+=
clear
== <= != 可用来比较字符串
size
max_size//s.max_size() 2147483647
empty
[]取单一字符

strstr

	char s1[] = "fuck you leather man";
	char s2[] = "you";
	//前母串，后子串
	char*ptr = strstr(s1, s2);
	de(ptr);//ptr you leather man

str插入与遍历

	string s = "fck you smmy";
	s.insert(s.begin() + 1, 'u');
	de(s);//s fuck you smmy
	//+,+=足以应付一般插入
	each(i, 0, s.size() - 1)
	{
		de(s[i]);
	}
	/*
	s[i] f
	s[i] u
	s[i] c
	s[i] k
	s[i]
	s[i] y
	s[i] o
	s[i] u
	s[i]
	s[i] s
	s[i] m
	s[i] m
	s[i] y
	*/

str删除

	string s = "01234567";
	s.erase(s.begin());
	de(s); //s 1234567
	s.erase(s.begin(), s.end ()- 5);
	de(s);//34567
	s.erase(0, 2);
	de(s);//567 左闭右开

str替换

	//replace 将从i开始的n个字符替换成s2
	string s = "fuckyouplease!";
	s.replace(4, 3, "me");
	de(s);
	s.replace(s.size()-1, 1, 6, '.');
	de(s);
	s.replace(s.begin(), s.begin() + 4, "rape");
	de(s);
	/*
	s fuckmeplease!
	s fuckmeplease......
	s rapemeplease......
	*/

str查找&比较

	string s = "i wanna fuck you rather than your sister";
	de(s.find("you"));
	de(s.find("you", 15));
	de((int)s.find("mother"));
	/*
	s.find("you") 13
	s.find("you", 15) 29
	(int)s.find("mother") -1
	*/
	string s1 = "abbb";
	string s2 = "bcccc";
	string s3 = "cdddd";
	de(s1 > s2); //s1 > s2 0
	de(s3 > s2); //s3 > s2 1