谁能给我些C++编程的实例？

答案：
列车车次信息查询与检索系统
#include <string.h>
#include <malloc.h>
#include <iostream.h>
#include <conio.h>

typedef struct node
{  char n[20];
   char ccnum[20];
   char time[10];
   struct node *next;
}NODE;
 
class employee
{
private:
NODE *p;
NODE *q;
NODE *t;
public:
employee(NODE *m); 
void add();
void printall();
void print();
void deleteall();
void edit();
void del();

void tongji()
{


int sm=0;

NODE *k;
k=new NODE;
k=p=q; 
char n[20];
cout<<"请输入站名:"<<endl;
cin>>n;
while (n)
{
k=p;
p=p->next;
if(p==t)
{

if(strcmp(q->n,n)==0)
{
sm++;

}
break;

} 

if(strcmp(p->n,n)==0)
{
sm++;
}
}

if(sm==0) cout<<"查无次车"<<endl;
cout<<"统计车次数目为："<<sm<<endl;

}

}; 
employee::employee(NODE *m)
{ 
t=p=m;
}
void employee::del()
{ 
NODE *k;
k=new NODE;
k=p=q; 
char n[20];
cout<<"请输入车次号码:"<<endl;
cin>>n;
while (p!=t&&(strcmp(p->ccnum,n)!=0)!=0)
    {k=p;
    p=p->next;
}
if (p==t)
{cout<<"查无此车!!"<<endl;
}
else
    {if (p==q)
    q=q->next;
    else
k->next=p->next;
free(p);
    }
}  
void employee::print()                                         
{ 
p=q;
char n[20];
cout<<"请输入车次号码:"<<endl;
cin>>n;
while (p!=t&&(strcmp(p->ccnum,n)!=0)!=0)
    {p=p->next;
}
if (p==t)
{cout<<"查无此车!!"<<endl;
}
else
    { cout<<"经过站点名称:"<<p->n<<endl;
cout<<"车次号码:"<<p->ccnum<<endl;

cout<<"发车时间:"<<p->time<<endl;

    }
cout<<"按任意键返回!!"<<endl;
}
void employee::edit()
{
p=q;
char n[20];
cout<<"请输入车次号码:"<<endl;
cin>>n;
while (p!=t&&(strcmp(p->ccnum,n)!=0)!=0)
    {p=p->next;
}
if (p==t)
{cout<<"查无此车!!"<<endl;
}
else
{cout<<"经过站点名称";
cin>>p->n;
cout<<"车次号码:";
cin>>p->ccnum;

cout<<"发车时间:";
cin>>p->time;


}
cout<<"按任意键返回!!"<<endl;
}
void employee::add()
{
q= new NODE;
q->next=p;
p=q;
cout<<"经过站点名称:";
cin>>q->n;
cout<<"车次号码:";
cin>>q->ccnum;

cout<<"发车时间:";
cin>>q->time;
}
void employee::printall()
{
  p=q;
 while (q!=t)
  {
  cout<<"经过站点:"<<q->n<<endl;
  cout<<"车次号码:"<<q->ccnum<<endl;

  cout<<"开车时间:"<<q->time<<endl;

  q=q->next;
 
 }
  q=p; 
}
void employee::deleteall()
{
while (q!=t)
{p=q;
q=q->next;
free(p);
}
cout<<"所有信息已删除！" ;
}

void display()
{  
cout<<"\n                                         欢迎使用本系统                          endl;

cout<<"\n                                                                                "<<endl;
cout<<"\n                        1:增加车次信息！"<<endl;
cout<<"\n                        2:修改车次信息！"<<endl;
cout<<"\n                        3:查找车次！"<<endl;
cout<<"\n                        4:显示车次信息！"<<endl;
cout<<"\n                        5:删除车次信息！"<<endl;
cout<<"\n                        6:删除所有车次信息！"<<endl;
cout<<"\n                        7:列车统计"<<endl;
cout<<"\n                        8:退出！"<<endl;  
cout<<"\n                                                                                "<<endl;
}


void main()                      
{
int j;
char n[20],rna[10];
NODE *pa;
char i; 
pa=(NODE*)malloc(sizeof(struct node)); 
display();
employee a(pa);
while(i=getch())
{
switch(i)
{
case'1':a.add();getch();display();break;
case'2':a.edit();getch();display();break;
case'3':a.print();getch();display();break;
case'4':a.printall();getch();display();break;
case'5':a.del();getch();display();break;
case'6':a.deleteall();getch();display();break;
case'7':a.tongji();getch();display();break;
case'8':cout<<"谢谢使用本系统!"<<endl;goto end;}
}
end:   ;
}
最简单的Hello World
#include<stdio.h>
#include<stdlib.h>

int main(){
    printf("Hello World!/n");
    return 0;
}
#include<iostream>
using namespace std;
void main()
{
 int a;
 cin>>a;
 cout<<a<<endl;
}
输入:1234
输出：1234

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