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网站建设问题,做网站电销,未明潮网站建设保密协议,网站开发代码实例string的构造函数string() //无参构造#xff0c;初始化为空串 string(const string str) //用str拷贝构造 string(size_t n,char c) //用n个字符c初始化 string(const char* s,size_t n) //用字符串s的前n个字符初始化 string(const string str,size_t pos,siz…string的构造函数string() //无参构造初始化为空串 string(const string str) //用str拷贝构造 string(size_t n,char c) //用n个字符c初始化 string(const char* s,size_t n) //用字符串s的前n个字符初始化 string(const string str,size_t pos,size_t lennpos) //将字符串str从下标pos位置开始选取长度为len个的字符来初始化代码语言javascriptAI代码解释string str1; //空串 string str2(hello world); //用hello world拷贝构造str2 string str3(4, x); //用4个字符x初始化 string str4(str2, 5, 6); //用str2中从下标为5位置开始长度为6的字符串初始化 string(hello world, 5); //用字符串hello world 前5个字符初始化string(const string str,size_t pos,size_t lennpos)注上面的缺省值npos定义为size_t npos-1. npos为最大值表示不传参数时会用str中pos位置开始后的所有字符来初始化二string的大小和容量size()和length():返回string对象的字符个数 capacity():string对象的容量也就是可以存储字符的最大个数代码语言javascriptAI代码解释string str(hello world); cout size str.size() endl; cout length str.length() endl; cout capacity str.capacity() endl;三string的插入insert代码语言javascriptAI代码解释string str1(hello world); str1.insert(5, xxxxxx); //在5位置之前插入字符串xxxxxx cout str1 endl; string str2(hello world); str2.insert(5, 2, %); //在5位置之前插入2个% cout str2 endl; string str3(hello world); string::iterator it1 str3.begin(); str3.insert(it1, #); //在开始位置之前插入# cout str3 endl; string str4(hello world); string::iterator it2 str4.begin(); str4.insert(it2, 2, #); //在开始位置之前插入两个# cout str4 endl;push_back(尾插代码语言javascriptAI代码解释string s; //空串 s.push_back(a); //尾插 s.push_back(c); s.push_back(b); //s中存放的字符串为abc四string的遍历迭代器遍历或者下标遍历代码语言javascriptAI代码解释string str1(hello world); //下标遍历 for (int i 0; i str1.size(); i) { cout str1[i]; } cout endl; //迭代器遍历 //正向迭代器 string::iterator it1 str1.begin(); while (it1 ! str1.end()) { cout *it1; it1; } cout endl; //反向迭代器 string::reverse_iterator it2 str1.rbegin(); while (it2 ! str1.rend()) { cout *it2; it2; } cout endl; //const正向迭代器 const string s(hello world); string::const_iterator cit s.begin(); while (cit ! s.end()) { cout *cit; cit; } cout endl; //const反向迭代器 string::const_reverse_iterator crit s.rbegin(); while (crit ! s.rend()) { cout *crit; crit; } cout endl;五string的删除erase(iterator p); //删除p所指位置的字符 erase(iteraror first,iterator last) //迭代器区间删除删除first到last区间的字符 erase(size_t pos,size_t lennpos) 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