求助链表，弄了好几天，没办法了伸手一次……
我用的是vc++6.0，本来程序还在完善中，但是提前编译了宜下，所有问题一一解决，最后总是在一个字符串比较的地方无限出错！~~用了各种版本，包括str1.compare(str2),或者strcmp（char *,char*),或者直接string类的‘==’重载，各种蛋疼到碎，我怀疑是不是编译器有问题，下面我把程序发一下，请高手大哥大姐教我！~~~~感激不尽！！~~~~~
//头文件--item.h
#ifndef _ITEM_H
#define _ITEM_H
#include<iostream>
#include<string.h>
using namespace std;
struct item
{
int credit;
string name;
item *next; //10
};
class student
{
private:
item *head;
item *last;
int count;
public:
student(); //20
void creat_s(int n,const string &str);
void delete_s(int n);
void delete_s(const string *str);
void print_s();
int Count_s(){return count;}
~student();
};
student::student()
{ //30
head=last=NULL;
count=0;
}
void student::creat_s(int n,const string &str)
{
if(head==NULL)
{
head=new item;
last=head; //40
head->credit=n;
head->name=str;
head->next=NULL;
count++;
return ;
}
else
{
item *p=new item;
p->credit=n; //50
p->name=str;
p->next=NULL;
last->next=p;
last=p;
count++;
return ;
}
}
void student::delete_s(int n) //60
{
item *p,*q;
if(head==NULL)
{
std::cout<<"This list is empty!You can't delete anything! "<<endl;
return ;
}
while(head->credit==n) //1：第一个节点需要删除的情况
{
if(head->next==NULL) //a:只有一个节点的情况 //70
{
delete head;
head=NULL;
return ;
}
item *it=head; //b:两个以上节点的情况
head=head->next;
delete it;
}
for(p=head->next,q=head;p!=last;q=p,p=p->next) //2:第一个和最后一个之间的节点需要删除的情况 //80
{
if(p->credit==n)
{
item *it=p;
p=p->next;
q->next=p;
delete it;
}
}
if(last->credit==n) //3:最后一个节点需要删除的情况 //90
{
item *it=last;
last=q;
last->next=NULL;
delete it;
}
}
void student::delete_s(string &str) //100
{
item *p,*q;
if(head==NULL)
{
std::cout<<"This list is empty!You can't delete anything! "<<endl;
return ;
}
while((head->name).compare(str)==0) //1：第一个节点需要删除的情况
{
if(head->next==NULL) //a:只有一个节点的情况 //110
{
delete head;
head=NULL;
return ;
}
item *it=head; //b:两个以上节点的情况
head=head->next;
delete it;
}
for(p=head->next,q=head;p!=last;q=p,p=p->next) //2:第一个和最后一个之间的节点需要删除的情况 //120
{
while((p->name).compare(str)==0)
{
item *it=p;
p=p->next;
q->next=p;
delete it;
}
}
if((last->name).compare(str)==0) //3:最后一个节点需要删除的情况 //130
{
item *it=last;
last=q;
last->next=NULL;
delete it;
return ;
}
}
//140
void student::print_s()
{
if(head==NULL)
{
std::cout<<"This is a empty list!You can't print it! "<<endl;
return ;
}
std::cout<<"\tPoint\tName"<<endl;
for(item *p=head;p!=NULL;p=p->next)
std::cout<<'\t'<<p->credit<<'\t'<<p->name<<endl;
return ;
}
student::~student()
{
while(head!=NULL)
{
item *it=head;
head=head->next;
delete it;
}
}
#endif
//主文件
#include"item.h"
#include<iostream>
#include<cstring>
using namespace std;
static student stu;
void add_message()
{
item it;
cout<<"You choose '1',let's add message to the system.\n"
<<"Please enter a name: "<<endl;
cin>>it.name;
cout<<"Please enter his(or her) points: "<<endl;
cin>>it.credit;
cout<<"You entered this group of message: \n"
<<'\t'<<it.name<<'t'<<it.credit<<'\n'
<<"Do you want to add it? Y/N"<<endl;
char c;
int count_c=0;
while(!((c=='n'||c=='N')||(c=='y'||c=='Y')))
{
cout<<"Mistake!Please enter again!"<<endl;
cin>>c;
c++;
if(c==10)
{
cout<<"You lost ten chance!The message is lost!"<<endl;
cout<<"Adding is over!"<<endl;
return ;
}
}
if(c=='y'||c=='Y')
stu.creat_s(it.credit,it.name);
else if(c=='n'||c=='N')
cout<<"OK,that massage is shrow!"<<endl;
else
cout<<"OH!Mistake is happened!"<<endl;
}
void delete_message()
{
cout<<"You choose '2',let's delete message from the system."<<endl;
cout<<"Now,what do you want to enter?name or point? N/P"<<endl;
char c;
cin>>c;
while(!((c=='n'||c=='N')||(c=='p'||c=='P')))
{
cout<<"Mistake!Please enter again!"<<endl;
cin>>c;
}
if(c=='n'||c=='N')
{
string str1;
cout<<"Please enter the name you want to delete: "<<endl;
cin>>str1;
cout<<"You want to delete "<<str1<<"\'s message."<<endl;
stu.delete_s(str1);
cout<<str1<<"\'s message has been deleted!"<<endl;
return ;
}
else if(c=='p'||c=='P')
{
int un1;
cout<<"Please enter the point you want to delete: "<<endl;
cin>>un1;
cout<<"You want to delete the message of "<<un1<<" point."<<endl;
stu.delete_s(un1);
cout<<un1<<" point has been deleted!"<<endl;
return ;
}
else
cout<<"Mistake! deleting is over!"<<endl;
return;
}
void print_student()
{
cout<<"You choose 3,let's print all the message!"<<endl;
}
void choose()
{
cout<<"Please enter a figure to contiune: \n"
<<"1:to add message(names and points);\n"
<<"2:to delete message(input name or point);\n"
<<"3:to print all the message;\n"
<<"4:to exit!"<<endl;
}
int main()
{
cout<<"Welcome to use this system!\n"
<<"You can set up a list for points and names.\n"
<<"Now!Let's begin!"<<endl;
choose();
int i;
add_message();
return 0;
}
求助 字符串比较
[解决办法]
你有引入string头文件吗？你是直接复制我的文件还是自己改的？逻辑上可能有问题，但编译上应该没问题的。
[解决办法]
string是对象，不是一段内存，不适合放在struct中。
