C ++编程主要帮助需要LINKED LISTS我只是看不到我的错误，虽然它正在运行

本文介绍了C ++编程主要帮助需要LINKED LISTS我只是看不到我的错误，虽然它正在运行的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 #include< iostream> using namespace std; struct list { char name [20]; int age double height; list * next; }; list * first = NULL，* current; int optn = 0; void currentfor（） { if（current-> next == NULL） cout< 列表已经结束！ << endl else current = current-> next; } void currentbac（） { if（current == first） cout< 这是列表的开始。 << endl else { list * previous; previous = first; while（previous-> next！= current） { previous = previous-> next; } current = previous; } } void addbeginning（） { list * newlist; newlist = new list; cout<< 输入你的名字： ; cin>> newlist-> name; cout<< 输入您的年龄：; cin>> newlist-> age; cout<< 输入您的身高：; cin>> newlist-> height; newlist-> next = first; first = newlist; } void addending（） { list * newlist，* newlist2; newlist = new list; cout<< 输入你的名字： ; cin>> newlist-> name; cout<< 输入你的年龄：; cin>> newlist-> age; cout<< 输入你的身高：; cin>> newlist-> height; newlist-> next = NULL; if（first == NULL） { first = newlist; current = first; } else { newlist2 = first; while（newlist2-> next！= NULL） { newlist2 = newlist2-> next; } newlist2-> next = newlist; } } void addmiddle（） { if（current-> next = NULL） addending else { list * newlist; newlist = new list; cout<< 输入你的名字： ; cin>> newlist-> name; cout<< 输入您的年龄：; cin>> newlist-> age; cout<< 输入你的身高：; cin>> newlist-> height; newlist-> next = current-> next; current-> next = newlist; } } void deletebegin（） { list * newlist; newlist = first; first = first-> next; delete newlist; } void deletemiddle（） { if（current-> next = NULL） cout<这个。; else { list * newlist; newlist = current; current = current-> next; delete newlist; } } void deleteend（） { list * newlist，* newlist2; if（first == NULL） cout<< 列表结束< endl else { newlist = first; if（newlist-> next == NULL） { delete newlist; first = NULL; } else { while（newlist-> next！= NULL） { newlist2 = newlist; newlist = newlist-> next; } delete newlist; newlist2-> next = NULL; } } } void display（） { list * newlist; newlist = first; cout<< endl do { if（newlist == NULL） cout<< 列表结束<< endl else { cout<< 名称是：< newlist-> name<< ; cout<< 年龄是：< newlist-> age<< ; cout<< 高度是：< newlist-> height; cout<<< - 当前位置; cout<< endl newlist = newlist-> next; } } while（newlist！= NULL）; cout<< 列表结束< endl } int main（） { first = NULL; do { display（）; cout<< endl cout<< 选择一个选项：< endl cout<< 1.将当前位置向前移动一次。 << endl cout<< 2.向后移动当前位置一次。 << endl cout<< 3.在列表的开头添加成员。 << endl cout<< 4.在列表的当前位置添加成员。 << endl cout<< 5.在列表的结尾处添加成员。 << endl cout<< 6.从列表中删除第一个成员。 << endl cout<< 7.从列表中删除当前位置的成员。 << endl cout<< 8.从列表中删除最后一个成员。 << endl cout<< 9.结束程序。 << endl cout<< endl<< >>; cin>> optn; switch（optn） { case 1：currentfor（）; break; case 2：currentbac（）; break; case 3：addbeginning（）; break; case 4：addmiddle（）; break; case 5：addending（）; break; case 6：deletebegin（）; break; case 7：deletemiddle（）; break; case 8：deleteend（）; break; } } while（optn！= 9）; } 我执行这个程序和3号工程。程序:( 有人可以给我显示正确的编码吗？我做一个链接列表与节点填充名称高度和年龄，它应该为任何用户工作和I m 解决方案 p>我更正了你的程序，并指出你应该注意在评论中的所有错误，请仔细看看他们，并试图看看你做错了，所以你可以从这个学习。 #include< iostream> 使用命名空间std; struct list { char名称[20]; int age; double height; list * next; }; list * first = NULL，* current = NULL; // Init current为NULL，这样你可以测试当前是否设置为 int optn = 0; void currentfor（）{ if（current == NULL）{ cout< 你还没有任何成员！ << endl } else { if（current-> next == NULL） cout<< 这是名单的结尾。 << endl else current = current-> next; } } void currentbac（）{ if（current == first） cout< 这是列表的开始。 << endl else { list * previous; previous = first; while（previous-> next！= current）{ previous = previous-> next; } current = previous; } } void addbeginning（）{ list * newlist; newlist = new list; cout<< 输入你的名字： ; cin>> newlist-> name; cout<< 输入您的年龄：; cin>> newlist-> age; cout<< 输入你的身高：; cin>> newlist-> height; newlist-> next = first; first = newlist; if（current == NULL）//将当前指针设置为first，因为这是你添加的第一个元素 current = first; } void addending（）{ list * newlist，* newlist2; newlist = new list; cout<< 输入你的名字： ; cin>> newlist-> name; cout<< 输入您的年龄：; cin>> newlist-> age; cout<< 输入你的身高：; cin>> newlist-> height; newlist-> next = NULL; if（first == NULL）{ first = newlist; current = first; } else { newlist2 = first; while（newlist2-> next！= NULL）{ newlist2 = newlist2-> next; } newlist2-> next = newlist; } } void addmiddle（）{ if（current-> next == NULL）//你在这里分配。使用==而不是=或者你将赋值给 // current-> next！这是不正确的。 addending（）; else { list * newlist; newlist = new list; cout<< 输入你的名字： ; cin>> newlist-> name; cout<< 输入您的年龄：; cin>> newlist-> age; cout<< 输入你的身高：; cin>> newlist-> height; newlist-> next = current-> next; current-> next = newlist; } } void deletebegin（）{ list * newlist; newlist = first; first = first-> next; //你需要先更新当前指针 if（newlist == current）{ current = current-> next; } delete newlist; } void deletemiddle（）{ list * newlist; newlist = first; //如果我们删除第一个元素 if（current == first）{ list * deleteMe = first; first = first-> next; delete deleteMe; current = current-> next; } else {//否则 //搜索直到newlist-> next == current // Als test for newlist！= NULL或者你将尝试从NULL获取下一个值 - >崩溃！ while（newlist！= NULL&& newlist-> next！= current） newlist = newlist-> next; if（newlist！= NULL）{ delete newlist-> next; newlist-> next = current-> next; //也从列表中的上一个节点更新下一个！或者它不会消失时显示 if（current-> next == NULL）//你在这里再次。使用==比较值，而不是= current = first; //这并不意味着你不必删除如果 //你没有current-> next。如果你没有current-> next， //只是将它设置为first。该元素确实需要删除。 else current = current-> next; } } } void deleteend（）{ list * newlist，* newlist2; if（first == NULL） cout<< 列表结束< endl else { newlist = first; if（newlist-> next == NULL）{ delete newlist; first = NULL; current = NULL; // current也应该为null } else { while（newlist-> next！= NULL）{ newlist2 = newlist; newlist = newlist-> next; } delete newlist; newlist2-> next = NULL; current = newlist2; //您忘记更新当前指针。 } } } void display（）{ list * newlist; newlist = first; cout<< endl do { if（newlist == NULL） cout<< 列表结束<< endl else { cout<< 名称是：< newlist-> name<< ; cout<< 年龄是：< newlist-> age<< ; cout<< 高度是：< newlist-> height; if（current == newlist）//你需要检查你是否真的在当前位置 cout<< cout<< endl newlist = newlist-> next; } } while（newlist！= NULL）; if（newlist！= NULL）//如果newList最初是NULL呢？您将打印两次。 cout<< 列表结束< endl } int main（void）{ first = NULL; do { display（）; cout<< endl cout<< 选择一个选项：< endl cout<< 1.将当前位置向前移动一次。 << endl cout<< 2.向后移动当前位置一次。 << endl cout<< 3.在列表的开头添加成员。 << endl cout<< 4.在列表的当前位置添加成员。 << endl cout<< 5.在列表的结尾处添加成员。 << endl cout<< 6.从列表中删除第一个成员。 << endl cout<< 7.从列表中删除当前位置的成员。 << endl cout<< 8.从列表中删除最后一个成员。 << endl cout<< 9.结束程序。 << endl cout<< endl<< >>; cin>> optn; switch（optn）{ case 1：currentfor（）; break; case 2：currentbac（）; break; case 3：addbeginning（）; break; case 4：addmiddle（）; break; case 5：addending（）; break; case 6：deletebegin（）; break; case 7：deletemiddle（）; break; case 8：deleteend（）; break; } } while（optn！= 9）; } #include <iostream>using namespace std;struct list{ char name[20]; int age; double height; list *next;};list *first = NULL, *current;int optn = 0;void currentfor(){ if (current->next == NULL) cout << "List has ended!" << endl; else current = current->next;}void currentbac(){ if (current == first) cout << "This is the beginning of the list." << endl; else { list *previous; previous = first; while (previous->next != current) { previous = previous->next; } current = previous; }}void addbeginning(){ list *newlist; newlist = new list; cout << "Enter your name:" ; cin >> newlist->name; cout << "Enter your age:" ; cin >> newlist->age; cout << "Enter your height:" ; cin >> newlist->height; newlist->next=first; first=newlist;}void addending(){ list *newlist, *newlist2; newlist = new list; cout << "Enter your name: "; cin >> newlist->name; cout << "Enter your age : "; cin >> newlist->age; cout << "Enter your height : "; cin >> newlist->height; newlist->next = NULL; if (first == NULL) { first = newlist; current=first; } else { newlist2 = first; while (newlist2->next != NULL) { newlist2 = newlist2->next; } newlist2->next = newlist; }}void addmiddle(){ if ( current->next=NULL) addending(); else { list *newlist; newlist=new list; cout << "Enter your name:" ; cin >> newlist->name; cout << "Enter your age:" ; cin >> newlist->age; cout << "Enter your height:" ; cin >> newlist->height; newlist->next=current->next; current->next=newlist; }}void deletebegin(){ list *newlist; newlist = first; first = first->next; delete newlist;}void deletemiddle(){ if ( current->next=NULL) cout<<"There is no one after this."; else { list *newlist; newlist=current; current=current->next; delete newlist; }}void deleteend(){ list *newlist, *newlist2; if (first == NULL) cout << "End of list" << endl; else { newlist = first; if (newlist->next == NULL) { delete newlist; first = NULL; } else { while (newlist->next != NULL) { newlist2 = newlist; newlist = newlist->next; } delete newlist; newlist2->next = NULL; } }}void display(){ list *newlist; newlist = first; cout << endl; do { if (newlist == NULL) cout << "End of List" << endl; else { cout << "Name is: " << newlist->name << " "; cout << "Age is: " << newlist->age << " "; cout << "Height is: " << newlist->height; cout<<" <-- Current position "; cout<< endl; newlist = newlist->next; } } while (newlist!=NULL); cout << "End of list" << endl;}int main(){ first = NULL; do { display(); cout << endl; cout << "Choose an option: " << endl; cout << "1. Move the current position forward once." << endl; cout << "2. Move the current position backwards once." << endl; cout << "3. Add a member at the beginning of the list." << endl; cout << "4. Add a member at the current position of the list." << endl; cout << "5. Add a member at the ending of the list." << endl; cout << "6. Delete the first member from the list." << endl; cout << "7. Delete the member at current position from the list." << endl; cout << "8. Delete the last member from the list." << endl; cout << "9. End program." << endl; cout << endl << " >> " ; cin >> optn; switch (optn) { case 1 : currentfor(); break; case 2 : currentbac(); break; case 3 : addbeginning(); break; case 4 : addmiddle(); break; case 5 : addending(); break; case 6 : deletebegin(); break; case 7 : deletemiddle(); break; case 8 : deleteend(); break; } } while (optn!= 9);}I execute this program and number 3 works.But the others seem to crash my program :( can someone please show me the correct coding to this?Im making a linked list with nodes filled with name height and age and it should work for any user.And I m supposed to display the entire list right?Or dont linked lists appear that way ?can some good soul please help? 解决方案 I corrected your program and indicated all errors you should pay attention to in the comments. Please take a good look at them and try to see what you did wrong, so you can learn from this.#include <iostream>using namespace std;struct list { char name[20]; int age; double height; list *next;};list *first = NULL, *current = NULL; // Init current to NULL so you can test whether current is set at allint optn = 0;void currentfor() { if(current == NULL) { cout << "You don't have any members yet!" << endl; } else { if (current->next == NULL) cout << "This is the end of the list." << endl; else current = current->next; }}void currentbac() { if (current == first) cout << "This is the beginning of the list." << endl; else { list *previous; previous = first; while (previous->next != current) { previous = previous->next; } current = previous; }}void addbeginning() { list *newlist; newlist = new list; cout << "Enter your name:" ; cin >> newlist->name; cout << "Enter your age:" ; cin >> newlist->age; cout << "Enter your height:" ; cin >> newlist->height; newlist->next = first; first = newlist; if(current == NULL) // Set the current pointer to first, because this is the first element you add current = first;}void addending() { list *newlist, *newlist2; newlist = new list; cout << "Enter your name: "; cin >> newlist->name; cout << "Enter your age : "; cin >> newlist->age; cout << "Enter your height : "; cin >> newlist->height; newlist->next = NULL; if (first == NULL) { first = newlist; current=first; } else { newlist2 = first; while (newlist2->next != NULL) { newlist2 = newlist2->next; } newlist2->next = newlist; }}void addmiddle() { if (current->next == NULL) // You were assigning here. Use == instead of = or you will assign NULL to // current->next! Which is incorrect. addending(); else { list *newlist; newlist = new list; cout << "Enter your name:" ; cin >> newlist->name; cout << "Enter your age:" ; cin >> newlist->age; cout << "Enter your height:" ; cin >> newlist->height; newlist->next = current->next; current->next = newlist; }}void deletebegin() { list *newlist; newlist = first; first = first->next; // You need to update the current pointer first if(newlist == current) { current = current->next; } delete newlist;}void deletemiddle() { list *newlist; newlist = first; // If we delete the first element if(current == first) { list *deleteMe = first; first = first->next; delete deleteMe; current = current->next; } else { // Otherwise // Search until newlist->next == current // Als test for newlist != NULL or you will try to get a next value from NULL -> crash! while(newlist != NULL && newlist->next != current) newlist = newlist->next; if(newlist != NULL) { delete newlist->next; newlist->next = current->next; // Also update the next from the previous node in the list! Or it will not disappear when displaying if (current->next == NULL) // You did it again here. Use == for comparing values instead of = current = first; // It doesn't mean that you don't have to delete if // you don't have a current->next. If you don't have a current->next, // just set it to first. The element does need to be deleted. else current = current->next; } }}void deleteend() { list *newlist, *newlist2; if (first == NULL) cout << "End of list" << endl; else { newlist = first; if (newlist->next == NULL) { delete newlist; first = NULL; current = NULL; // Current should also be null } else { while (newlist->next != NULL) { newlist2 = newlist; newlist = newlist->next; } delete newlist; newlist2->next = NULL; current = newlist2; // You forgot to update the current pointer. } }}void display() { list *newlist; newlist = first; cout << endl; do { if (newlist == NULL) cout << "End of List" << endl; else { cout << "Name is: " << newlist->name << " "; cout << "Age is: " << newlist->age << " "; cout << "Height is: " << newlist->height; if(current == newlist) // You need to check whether you really are at the current position cout<<" <-- Current position "; cout<< endl; newlist = newlist->next; } } while(newlist!=NULL); if(newlist != NULL) // What if the newList was initially NULL? You will print twice. cout << "End of list" << endl;}int main(void) { first=NULL; do { display(); cout << endl; cout << "Choose an option: " << endl; cout << "1. Move the current position forward once." << endl; cout << "2. Move the current position backwards once." << endl; cout << "3. Add a member at the beginning of the list." << endl; cout << "4. Add a member at the current position of the list." << endl; cout << "5. Add a member at the ending of the list." << endl; cout << "6. Delete the first member from the list." << endl; cout << "7. Delete the member at current position from the list." << endl; cout << "8. Delete the last member from the list." << endl; cout << "9. End program." << endl; cout << endl << " >> " ; cin >> optn; switch (optn) { case 1 : currentfor(); break; case 2 : currentbac(); break; case 3 : addbeginning(); break; case 4 : addmiddle(); break; case 5 : addending(); break; case 6 : deletebegin(); break; case 7 : deletemiddle(); break; case 8 : deleteend(); break; } } while (optn!= 9);} 这篇关于C ++编程主要帮助需要LINKED LISTS我只是看不到我的错误，虽然它正在运行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！