6.27-6.29 旧c语言

jwh1996942024-06-30 11:31
c 复制代码 
#include<stdio.h>
struct stu
{
    int num;
    float score;
    struct stu *next;
};
void main()
{
    struct stu a,b,c,*head;//静态链表
    a.num = 1;
    a.score = 10;
    b.num = 2;
    b.score = 20;
    c.num = 3;
    c.score = 30;
    head = &a;
    a.next = &b;
    b.next = &c;
    do
    {
        printf("%d,%5.1f\n",head->num,head->score);
        head = head->next;
    }while(head != NULL);
}


c 复制代码 
#include<stdio.h>
#include<stdlib.h>
#define LEN sizeof(struct stu)
int n;
struct stu
{
    int num;
    float score;
    struct stu *next;
};
struct stu *creat()//建立动态链表
{
    struct stu *p1,*p2,*head;
    p1 = p2 = (struct stu *)malloc(LEN);
    printf("input num:\n");
    scanf("%d",&p1->num);
    printf("input score:\n");
    scanf("%f",&p1->score);
    head = NULL,n = 0;
    while(p1->num != 0)
    {
        n++;
        if(n == 1)
        {
            head = p1;
        }
        else
        {
            p2->next = p1;
        }
        p2 = p1;//
        p1 = (struct stu *)malloc(LEN);
        printf("input num:\n");
        scanf("%d",&p1->num);
        printf("input score:\n");
        scanf("%f",&p1->score);
    }
    p2->next = NULL;
    return head;

}
void print(struct stu *head)
{
    struct stu *p;
    printf("there are %d record stu\n",n);
    p = head;
    if(head != NULL)
    {
        do
        {
            printf("num = %d,score = %f\n",p->num,p->score);
            p = p->next;
        }while(p);//直到p为空结点退出循环
    }
}
void main()
{
    struct stu *p;
    p = creat();
    print(p);
}
c 复制代码 
#include<stdio.h>//增删改查
#include<stdlib.h>
#define LEN sizeof(struct stu)
struct stu *del(struct stu *head,int n);
struct stu *creat();
void print(struct stu *head);
int n;
struct stu
{
    int num;
    float score;
    struct stu *next;
};
struct stu *del(struct stu *head,int m)
{
    struct stu *p1,*p2;
    p1 = head;
    if(head == NULL)//判断是否为空链表
    {
        printf("this is kong node\n");
        return NULL;
    }
    while(p1->num != m && p1->next != NULL)//删除的值不是当前结点，且当前结点不为尾节点
    {
        p2 = p1;
        p1 = p1->next;
    }
    if(p1->num == m)//找到节点
    {
        if(p1 == head)//如果当前节点为头结点
        {
            head = p1->next;
        }
        else//此时为普通结点
        {
            p2->next = p1->next;
        }
        printf("del NO：%d success!\n",m);
        n = n-1;
    }
    else
    {
        printf("%d no found!\n",n);
    }
    return head;
}
struct stu *creat()
{
    struct stu *p1,*p2,*head;
    p1 = p2 = (struct stu *)malloc(LEN);
    printf("input num:\n");
    scanf("%d",&p1->num);
    printf("input score:\n");
    scanf("%f",&p1->score);
    head = NULL,n = 0;
    while(p1->num != 0)
    {
        n++;
        if(n == 1)
        {
            head = p1;
        }
        else
        {
            p2->next = p1;
        }
        p2 = p1;
        p1 = (struct stu *)malloc(LEN);
        printf("input num:\n");
        scanf("%d",&p1->num);
        printf("input score:\n");
        scanf("%f",&p1->score);
    }
    p2->next = NULL;
    return head;

}
void print(struct stu *head)
{
    struct stu *p;
    printf("there are %d record stu\n",n);
    p = head;
    if(head != NULL)
    {
        do
        {
            printf("num = %d,score = %f\n",p->num,p->score);
            p = p->next;
        }while(p);
    }
}
void main()
{
    struct stu *stu,*p;
    int k;
    stu = creat();
    p = stu;
    print(p);
    printf("del num is:\n");
    scanf("%d",&k);
    print(del(p,k));
}


c 复制代码 
#include<stdio.h>
#include<stdlib.h>
#define LEN sizeof(struct stu)
struct stu *del(struct stu *head,int n);
struct stu *creat();
void print(struct stu *head);
struct stu *inser(struct stu *head,struct stu *ins);
struct stu *lookfor(struct stu *head,struct stu *look);
struct stu *wrilink(struct stu *head,struct stu *stu4);
struct stu
{
    int num;
    float score;
    struct stu *next;
};
int n;
struct stu *wrilink(struct stu *head,struct stu *stu4)
{
    struct stu *p;
    p = head;
    if(head == NULL)
    {
        printf("无数据可修改!\n");
    }
    else
    {
        while(p != NULL)
        {
            if(p->num == stu4->num)
            {
                p->score = stu4->score;
            }
            p = p->next;
        }
    }
    return head;
}
struct stu *lookfor(struct stu *head,struct stu *look)
{
    struct stu *p;
    p = head;
    if(p == NULL)
    {
        printf("没有数据!\n");
    }
    else
    {
        while(p != NULL)
        {
            if(p->num == look->num)
            {
                printf("找到第%d个数据,分数为%f\n",p->num,p->score);
            }
            p = p->next;
        }
    }
    return head;
}
struct stu *inser(struct stu *head,struct stu *ins)
{
    struct stu *p1,*p2,*p0;
    p0 = ins;
    p1 = head;
    if(head == NULL)
    {
        head = p0;
        p0->next = NULL;
    }
    else
    {
        while((p0->num >p1->num) && (p1->next != NULL))
        {
            p2 = p1;
            p1 = p1->next;
        }
        if(p0->num <= p1->num)
        {
            if(p1 == head)
            {
                head = p0;
            }
            else
            {
                p2->next = p0;
            }
            p0->next = p1;
        }
        else
        {
            p1->next = p0;
            p0->next = NULL;
        }
        n = n+1;
        return head;
    }
}
struct stu *del(struct stu *head,int m)
{
    struct stu *p1,*p2;
    p1 = head;
    if(head == NULL)
    {
        printf("this is kong node\n");
        return NULL;
    }
    while(p1->num != m && p1->next != NULL)
    {
        p2 = p1;
        p1 = p1->next;
    }
    if(p1->num == m)
    {
        if(p1 == head)
        {
            head = p1->next;
        }
        else
        {
            p2->next = p1->next;
        }
        printf("del NO：%d success!\n",m);
        n = n-1;
    }
    else
    {
        printf("%d no found!\n",n);
    }
    return head;
}
struct stu *creat()
{
    struct stu *p1,*p2,*head;
    p1 = p2 = (struct stu *)malloc(LEN);
    printf("input num:\n");
    scanf("%d",&p1->num);
    printf("input score:\n");
    scanf("%f",&p1->score);
    head = NULL,n = 0;
    while(p1->num != 0)
    {
        n++;
        if(n == 1)
        {
            head = p1;
        }
        else
        {
            p2->next = p1;
        }
        p2 = p1;
        p1 = (struct stu *)malloc(LEN);
        printf("input num:\n");
        scanf("%d",&p1->num);
        printf("input score:\n");
        scanf("%f",&p1->score);
    }
    p2->next = NULL;
    return head;

}
void print(struct stu *head)
{
    struct stu *p;
    printf("there are %d record stu\n",n);
    p = head;
    if(head != NULL)
    {
        do
        {
            printf("num = %d,score = %f\n",p->num,p->score);
            p = p->next;
        }while(p != NULL);
    }
}
void main()
{
    struct stu *stu,*p,stu2,stu3,stu4;
    int k;
    stu = creat();
    p = stu;
    print(p);
    printf("del num is:\n");
    scanf("%d",&k);
    print(del(p,k));
    printf("insert into the num:");
    scanf("%d",&stu2.num);
    printf("insert into the score:");
    scanf("%f",&stu2.score);
    p = inser(stu,&stu2);
    print(p);
    printf("请输入查找的数据是:");
    scanf("%d",&stu3.num);
    lookfor(stu,&stu3);
    printf("请输入修改的学号:");
    scanf("%d",&stu4.num);
    printf("请输入修改的学号数据:");
    scanf("%f",&stu4.score);
    p = wrilink(stu,&stu4);
    print(p);
}

typedef 声明新的类型名来代替已有的类型名，有利于程序通用与移植

c 复制代码 
#include<stdio.h>
typedef struct
{
    int year;
    int month;
    int day;
}date;
void main()
{
    date da;
    da.year = 1995;
    da.month = 8;
    da.day = 9;
    printf("%d--%d--%d\n",da.year,da.month,da.day);
}
c 复制代码 
#include<stdio.h>
typedef int num[100];//声明um为整型数组类型
void main()
{
  num n = {0};
  printf("%d\n",sizeof(n));
}
c 复制代码 
#include<stdio.h>
typedef void (*p)();
void fun()
{
    printf("funny\n");
}
void main()
{
    p p1;
    p1 = fun;//函数指针指向函数的入口
    p1();
}



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