十二周

1

#include <iostream>  
  
using namespace std;  
struct student  
{  
    long num;  
    char name[20];  
    float score[3];  
};  
void print(student stu);  
int main()  
{  
    student stu;  
    cout<<"请输入学生的学号：";  
    cin>>stu.num;  
    cin.get();  
    cout<<"请输入学生的姓名：";  
    cin.get(stu.name,20);  
    cin.get();  
    for(int i=0;i<3;i++)  
    {  
        cout<<"请输入第 "<<i+1<<" 门成绩：";  
        cin>>stu.score[i];  
    }  
  
    print(stu);  
    return 0;  
}  
void print(student stu)  
{  
    cout<<"姓名："<<stu.name<<endl;  
    cout<<"学号："<<stu.num<<endl;  
    cout<<"成绩："<<endl;  
    for(int i=0;i<3;i++)  
        cout<<stu.score[i]<<"    ";  
    cout<<endl;  
}  

2

#include <iostream>  
  
using namespace std;  
struct student  
{  
    long num;  
    char name[20];  
    float score[3];  
};  
void print(student *stu);  
int main()  
{  
    student stu;  
    cout<<"请输入学生的学号：";  
    cin>>stu.num;  
    cin.get();  
    cout<<"请输入学生的姓名：";  
    cin.get(stu.name,20);  
    cin.get();  
    for(int i=0;i<3;i++)  
    {  
        cout<<"请输入第 "<<i+1<<" 门成绩：";  
        cin>>stu.score[i];  
    }  
  
    print(&stu);  
    return 0;  
}  
void print(student *stu)  
{  
    cout<<"姓名："<<stu->name<<endl;  
    cout<<"学号："<<stu->num<<endl;  
    cout<<"成绩："<<endl;  
    for(int i=0;i<3;i++)  
        cout<<stu->score[i]<<"    ";  
    cout<<endl;  
}  

3

#include <iostream>  
  
using namespace std;  
union asc  
{  
    int num;  
    char ch[2];  
};  
int main()  
{  
    asc ascii;  
    cout<<"请输入要转换成ASCII码的整数：";  
    cin>>ascii.num;  
    cout<<"其对应的ASCII码为："<<ascii.ch<<endl;  
    return 0;  
}  

4

5

#include <iostream>  
  
using namespace std;  
struct time  
{  
    int year;  
    int month;  
    int day;  
};  
int main()  
{  
    cout<<"请输入一个时间（年，月，日）：";  
    time a_time;  
    cin>>a_time.year>>a_time.month>>a_time.day;  
    int day_year;  
    if((a_time.year%4==0&&a_time.year%100!=0)||a_time.year%400==0)  
    {  
        switch(a_time.month)  
        {  
            case 1:day_year=a_time.day;break;  
            case 2:day_year=31+a_time.day;break;  
            case 3:day_year=60+a_time.day;break;  
            case 4:day_year=91+a_time.day;break;  
            case 5:day_year=121+a_time.day;break;  
            case 6:day_year=152+a_time.day;break;  
            case 7:day_year=182+a_time.day;break;  
            case 8:day_year=213+a_time.day;break;  
            case 9:day_year=244+a_time.day;break;  
            case 10:day_year=274+a_time.day;break;  
            case 11:day_year=305+a_time.day;break;  
            case 12:day_year=335+a_time.day;break;  
        }  
    }  
    else  
    {  
        switch(a_time.month)  
        {  
            case 1:day_year=a_time.day;break;  
            case 2:day_year=31+a_time.day;break;  
            case 3:day_year=59+a_time.day;break;  
            case 4:day_year=90+a_time.day;break;  
            case 5:day_year=120+a_time.day;break;  
            case 6:day_year=151+a_time.day;break;  
            case 7:day_year=181+a_time.day;break;  
            case 8:day_year=212+a_time.day;break;  
            case 9:day_year=243+a_time.day;break;  
            case 10:day_year=273+a_time.day;break;  
            case 11:day_year=304+a_time.day;break;  
            case 12:day_year=334+a_time.day;break;  
        }  
    }  
    cout<<"该日是本年中第 "<<day_year<<" 天"<<endl;  
    return 0;  
}  

6

7

8

 #include <iostream>    
using namespace std;  
struct student  
{  
   long num;  
   char name[20];  
   float score;  
   int age;  
   student *next;    
};  
student *creat();  
void print(student *head);  
student *del(student *head,int num_1);  
int n=0;  
int main()  
{  
    student *head=creat();  
    cout<<"新建的链表为："<<endl  
    <<"学号\t姓名\t年龄\t成绩"<<endl;  
   print(head);  
   cout<<"请输入要删除的学生的年龄：";  
   int num_1;  
   cin>>num_1;  
   head=del(head,num_1);  
   cout<<"更改后的链表为："<<endl  
    <<"学号\t姓名\t年龄\t成绩"<<endl;  
   print(head);  
    return 0;  
}  
student *creat()  
{  
   student *head,*p1,*p2;  
   head=NULL;  
   p1=new(student);  
   p2=p1;  
   cout<<"请输入，当学号为0时，停止输入"<<endl;  
   cout<<"请输入第 "<<n+1<<" 个学生的学号：";  
   cin>>p1->num;  
   cin.get();  
   cout<<"请输入其姓名：";  
   cin.get(p1->name,20);  
   cin.get();  
   cout<<"请输入其年龄：";  
   cin>>p1->age;  
   cin.get();  
   cout<<"请输入其成绩：";  
   cin>>p1->score;  
   cin.get();  
   while(p1->num!=0)  
   {  
    n++;  
    if(n==1)  
     head=p1;  
    else  
    {  
     p2->next=p1;  
     p2=p1;  
    }  
    p1=new(student);  
    cout<<"请输入第 "<<n+1<<" 个学生的学号：";  
    cin>>p1->num;  
    cin.get();  
    cout<<"请输入其姓名：";  
    cin.get(p1->name,20);  
    cin.get();  
    cout<<"请输入其年龄：";  
    cin>>p1->age;  
    cin.get();  
    cout<<"请输入其成绩：";  
    cin>>p1->score;  
    cin.get();  
   }  
   delete p1;  
   p2->next=NULL;  
   return head;  
}  
void print(student *head)  
{  
   student *p;  
   p=head;  
   if(p==NULL)return;  
   do  
   {  
    cout<<p->num<<"        "<<p->name<<"        "<<p->age<<"        "<<p->score<<endl;  
    p=p->next;  
   }while(p!=NULL);  
}  
student *del(student *head,int num_1)  
{  
   student *p1,*p2;  
   if(head==NULL)  
   {  
    cout<<"这是个空表"<<endl;  
    return head;  
   }  
   p1=head;  
   p2=p1;  
   while(p1->age!=num_1&&p1->next!=NULL)  
   {  
    p2=p1;  
    p1=p1->next;  
   }  
   if(p1->age==num_1)  
   {  
    if(p1==head)  
    head=p1->next;  
    else  
    {  
     p2->next=p1->next;  
    }    
   }  
   else  
    cout<<"未找到此学号的学生。"<<endl;  
  return head;       
}