c++实现的一个链式串
链式串类LinkString源码:
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#pragma once class StringNode { public: char element; StringNode *next; }; class LinkString { public: LinkString(void) { top = new StringNode(); } LinkString(char * s2) { top = new StringNode(); *this = s2; //运算符=重载,用char串赋值 } //用char串赋值 void operator=(char * s2) { StringNode * temp; temp = top; for(int i =0;s2[i]!='\0';i++) { if(temp->next==NULL) temp->next = new StringNode(); temp->next->element = s2[i]; temp = temp->next; } } //串的比较 int Compare(LinkString *list2) { StringNode *temp1 = top->next; StringNode *temp2 = list2->GetTopElement(); while(temp1!=NULL&&temp2!=NULL) { if(temp1->element!=temp2->element) break; else { temp1 = temp1->next; temp2 = temp2->next; } } if(temp1==NULL&&temp2!=NULL) return -1; else if(temp1!=NULL&&temp2==NULL) return 1; else if(temp1==NULL&&temp2==NULL) return 0; else if(temp1->element>temp2->element) return 1; else if(temp1->element<temp2->element) return -1; } //根据下标和长度截取子串 LinkString * SubStr(int index,int length) { if(index+length>GetLength()) return NULL; StringNode *temp = top; for(int i=0;i<=index;i++) temp = temp->next; char * newlist = new char[length+1]; for(int i=0;i<length;i++) { newlist[i] = temp->element; temp = temp->next; } newlist[length] = '\0'; return new LinkString(newlist); } //查询子串在主串中的下标 int IndexOf(LinkString *list2) { if(GetLength()<list2->GetLength()) return -1; StringNode *temp = top->next; char t = list2->GetTopElement()->element; int i = 0; for(i=0;i<=GetLength()-list2->GetLength();temp=temp->next,i++) { if(temp->element==t) if(list2->Compare(this->SubStr(i,list2->GetLength()))==0) return i; } return -1; } //串的拼接,将list2拼接到本串尾部 void Concat(LinkString *list2) { StringNode *temp = top; while(temp->next!=NULL) temp = temp->next; temp->next = list2->GetTopElement(); } //插入串 void Insert(int index,LinkString *list2) { if(index>GetLength()||index<0) return; StringNode *temp = top; for(int i=0;i<index;i++) temp = temp->next; StringNode *t = temp->next; //temp为插入位置前一个节点,temp->next为插入位置的节点 StringNode * temp2 = list2->GetTopElement(); while(temp2!=NULL) { StringNode *t2 = new StringNode(); t2->element = temp2->element; temp->next = t2; temp = temp->next; temp2 = temp2->next; } temp->next = t; } //删除串 void Delete(int index,int length) { if(index>GetLength()-1||index<0||index+length>GetLength()) return; StringNode *temp = getNode(index-1); //temp记录下了要删除位置的前一个节点 StringNode *t = temp->next; for(int i =0;i<length;i++) t = t->next; temp->next = t; } //获取链串的长度 int GetLength() { StringNode *temp = top; int i=0 ; while(temp->next!=NULL) { temp = temp->next; i++; } return i; } //获取链串的第一个元素 StringNode * GetTopElement() { return top->next; } //返回char数组 char * ToString() { StringNode *temp = top->next; int len = GetLength(); char * charlist = new char[len+1]; for(int i =0;i<len;i++) { charlist[i] = temp->element; temp = temp->next; } charlist[len] = '\0'; return charlist; } //根据下标获取元素 char get(int index) { return getNode(index)->element; } ~LinkString(void) { } private: StringNode *top; StringNode * getNode(int index) { StringNode *temp = top; for(int i=0;i<=index;i++) temp = temp->next; return temp; } };
测试代码:
//串的链式存储结构 LinkString *str = new LinkString("abcdefg"); LinkString *str2 = new LinkString("cde"); //std::cout<<str->GetLength()<<std::endl; //测试获取链串长度 //str->Concat(str2); //测试拼接 //std::cout<<str->ToString()<<std::endl; //for(int i=0;i<str->GetLength();i++) //{ // std::cout<<str->get(i) ; //测试get()遍历 //} std::cout<<std::endl; //std::cout<<str->Compare(str2)<<std::endl; //测试字符串的比较 //std::cout<<str->SubStr(3,3)->ToString()<<std::endl; //测试取子串 //std::cout<<str->IndexOf(str2)<<std::endl; //测试子串在主串中的下标 //str->Insert(0,str2); //std::cout<<str->ToString()<<std::endl; //测试插入串 //str->Delete(2,5); //std::cout<<str->ToString()<<std::endl; //测试插入串