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  • 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
    
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  • 原文地址:https://www.cnblogs.com/Tony100K/p/11608373.html
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