学习笔记 2017-2-28

单链表

#include
#include
#define N 100
using namespace std;
struct student{
	char num;
	char name;
	struct student *next;
};
class Linklist{
	struct student first;//头结点 
public:
	Linklist();
	Linklist(student a[],int n);
	int Length();
	~Linklist();
	void PrintList();
};
Linklist::Linklist(){
	first.next=NULL;
}
int Linklist::Length(){
	int n=0;
	struct student *p;
	p=first.next;
	while(p){
		n++;
		p=p->next;
	}
	cout<num=a[i].num;
		p->name=a[i].name;
		p->next=first.next;
		first.next=p;	
	}//头插法 
}
Linklist::~Linklist(){
	struct student *p;
	while(first.next){
		p=first.next;
		first.next=p->next;
		delete p;
	}
}
void Linklist::PrintList(){
	struct student *p;//
	p=first.next;//
	while(p){
		cout<num<<' '<name<next;
	}
}
int main(){
//	struct student a[N]={
//		{1,'a'},
//		{2,'b'},
//		{3,'c'}//不能写成 "c"
//	};//结构体数 
//	int n=3;
	struct student a[N];
	int n=3;
	ifstream infile("1.txt",ios::in);
	if(!infile){
		cerr<<"open error!";
		exit(1);
	}
//	while(infile){
//		for(int i=0;i>a[i].num>>a[i].name;
//			n++;
//		}
//	}//错
	for(int i=0;i>a[i].num>>a[i].name;
	infile.close();
	Linklist x(a,n);
	x.PrintList();
	x.Length();
	return 0;
}

疑问：如何在计算文件中数据的个数？