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C语言课设:基于单向循环链表的学生管理系统的增删改查排序

作者:互联网

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>
typedef struct Student         //定义结构体
{
    long num;         //学号
    char name[20];         //姓名
    char sex;         //性别
    float Chinese;         //语文成绩
    float Math;         //数学成绩
    float English;         //英语成绩
    float aver;         //平均分
}student;
typedef struct CLinkNode
{
	student data;
	struct CLinkNode *next;
}CLinkNode;
int n;
int Menu();
int menu();
int sort(CLinkNode *head);
void number(CLinkNode *head);
void aver(CLinkNode *head);
CLinkNode *creat_node();//创建头节点
int InitCLinkList(CLinkNode *head);
int ShowCLinkList(CLinkNode *head);
int delete_list(CLinkNode *head);
int Modify_information(CLinkNode *head);
void write(CLinkNode *head);
void read(CLinkNode *head);
int n;
int main()
{
    int a;
    CLinkNode *head;
    head=creat_node();//创建头节点
    head->next=head;//自我循环
    while(1)
    {
        a = Menu();
        switch(a)
        {
            case 1:InitCLinkList(head);break;
            case 2:ShowCLinkList(head);break;
            case 3:delete_list(head);break;
            case 4:Modify_information(head);break;
            case 5:InitCLinkList(head);break;
            case 6:sort(head);break;
            case 7:write(head);break;
            case 8:read(head);break;
            case 9:
                system("cls");
                printf("\n\n\n\n\n\n\n\n\n\n\n\n");
                printf("\t\t\t\t\t\t已退出...\n\n\n\n\n\n\n\n\n\n\n\n");
                exit(0);
                break;
            default:
                system("cls");
                printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t请输入正确的选择(按任意键继续)");
                break;
        }
        getch();
    }
    return 0;
}
int Menu()          //一级菜单
{
    system("cls");
    int a;
    printf("\n");
    printf("\t\t\t\t\t-------------------------\n");
	printf("\t\t\t\t\t|   学生成绩管理系统V2.0|\t\t\t\n");
	printf("\t\t\t\t\t|\t请选择功能\t|\t\t\t\t\n");
	printf("\t\t\t\t\t-------------------------\n");
	printf("\t\t\t\t\t|\t1.录入信息\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|\t2.打印信息\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|\t3.删除信息\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|\t4.修改信息\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|\t5.增加信息\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|\t6.信息排序\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|    7.保存信息到文件\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|    8.从文件读取信息\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|\t9.退出系统\t|\t\t\t\t\n");
	printf("\t\t\t\t\t-------------------------\n");
	printf("\n");
	printf("\t\t\t\t\t请输入您要选择的功能键: ");
    scanf("%d",&a);
    return a;
}
int menu()          //二级菜单
{
    system("cls");
    int d;
    printf("\n");
    printf("\t\t\t\t\t-------------------------\n");
	printf("\t\t\t\t\t|   学生成绩管理系统V2.0|\t\t\t\n");
	printf("\t\t\t\t\t|\t请选择功能\t|\t\t\t\t\n");
	printf("\t\t\t\t\t-------------------------\n");
	printf("\t\t\t\t\t|\t1.学号排序\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|\t2.平均分排序\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|\t3.返回上一级\t|\t\t\t\t\n");
	printf("\t\t\t\t\t|\t4.退出系统\t|\t\t\t\t\n");
	printf("\t\t\t\t\t-------------------------\n");
	printf("\n");
	printf("\t\t\t\t\t请输入您要选择的功能键: ");
    scanf("%d",&d);
    return d;
}
void write(CLinkNode *head)
{
    FILE *fp;
    CLinkNode *p;
    int i;
    if ((fp = fopen("学生信息管理.txt", "w")) == NULL)    //打开文件准备写入
    {
        printf("cannot open this file!\n");
        getch();
        return;
    }
    p=head->next;
    for(i=0;i<n;i++)
    {
        fprintf(fp,"%ld %s %c %.2f %.2f %.2f\n",p->data.num,p->data.name,p->data.sex,p->data.Chinese,p->data.Math,p->data.English);
        p = p->next;
    }
    fclose(fp);
    system("cls");
        printf("\n\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\tout save!");    //写入成功
}
void read(CLinkNode *head)
{
    system("cls");
    printf("文件信息存放如下:\n");
    FILE *fp;
    CLinkNode *p=head;
    if ((fp = fopen("学生信息管理.txt", "r")) == NULL)
    {
        printf("cannot open this file\n!");
        getch();
        exit(0);
    }
    while(!feof(fp))
    {
        if(fscanf(fp,"%ld %s %c %f %f %f",&p->data.num,p->data.name,&p->data.sex,&p->data.Chinese,&p->data.Math,&p->data.English)==EOF)
        {
            free(p);
            break;
        }
        printf("%ld\t%s\t%c\t%.2f\t%.2f\t%.2f\n",p->data.num,p->data.name,p->data.sex,p->data.Chinese,p->data.Math,p->data.English);
        p=p->next;
    }
}
int sort(CLinkNode *head)       //排序
{
    system("cls");
    int d;
    while(1)
    {
        d = menu();
        switch(d)
        {
            case 1:number(head);break;       //学号排序
            case 2:aver(head);break;       //平均分排序*/
            case 3:return(1);       //返回上一级
            case 4:exit(0);break;       //退出
            default:
                system("cls");
                printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t请输入正确的选择(按任意键继续)");
                break;
        }
        getch();
    }
    return 0;
}
CLinkNode *creat_node()//节点创建函数
{
    CLinkNode *p=(CLinkNode *)malloc(sizeof(CLinkNode));
    if(p==NULL)
    {
        printf("创建失败");
    }
    else
    {
        p->next=NULL;
        return p;
    }
}
int InitCLinkList(CLinkNode *head)//插入数据到链表中
{
    system("cls");

    long number;
    char name1[20];
    char sex1;
    float Chinese1;
    float Math1;
    float English1;
	    printf("\n\n输入学号:\n");
	    getchar();
		scanf("%ld",&number);
		printf("\n输入姓名:\n");
		getchar();
		gets(name1);
		printf("\n输入性别(m or f):\n");
		scanf("%c",&sex1);
		printf("\n输入语数英成绩(百分制):\n");
		scanf("%f%f%f",&Chinese1,&Math1,&English1);
		if(sex1 != 'm' && sex1 != 'f')
        {
            printf("性别输入错误!(按任意键返回菜单)");
            getch();
            Menu();
        }
        if(Chinese1>100 || Chinese1<0 ||
            Math1>100 || Math1<0 ||
            English1>100 || English1<0)
        {
            printf("成绩输入错误!(按回车返回菜单)");
            getch();
            Menu();
        }

		CLinkNode *q=creat_node();
		q->data.num=number;
		strcpy(q->data.name,name1);
		q->data.sex=sex1;
        q->data.Chinese=Chinese1;
		q->data.Math=Math1;
		q->data.English=English1;
		n++;
		printf("\n\n录入成功,按任意键继续");
	if(head!=NULL)//判断头节点是否为NULL
    {
        CLinkNode *p=head;
        while(p->next!=head)//遍历头节点到最后一个数据
        {
            p=p->next;
        }
        p->next=q;//把最后一个节点赋新的节点过去
        q->next=head;
        return 1;
    }
    else
    {
        return 0;
    }

}
int ShowCLinkList(CLinkNode *head)
{
    system("cls");
    printf("\n学生信息:\n");
	printf("学号\t姓名\t性别\t语文\t数学\t英语\n");
	printf("-----------------------------------------------------\n");
	if (head!=NULL)
	{
		CLinkNode *p=head;
		while(p->next!=head)
        {
            printf("%ld\t%s\t%c\t%.2f  %.2f  %.2f\n",p->next->data.num,p->next->data.name,p->next->data.sex,p->next->data.Chinese,p->next->data.Math,p->next->data.English);
            p=p->next;
        }
        printf("\n\n打印成功,按任意键继续");
        return 1;
	}
	else
        {
            return 0;
        }
}
int delete_list(CLinkNode *head)
{
    system("cls");
    if(head==NULL)
    {
        printf("链表为空!\n");
        return 0;
    }
    CLinkNode *before=head;
    CLinkNode *behind=head->next;
    long nn;
    printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t请输入你要删除的学号:");
    scanf("%ld",&nn);
    while(behind!=head)
    {
        if(behind->data.num==nn)
        {
            if(behind->next==head)
            {
                before->next=head;
                free(behind);
                system("cls");
                printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t删除成功...");
                return 1;
            }
            before->next = behind->next;
            free(behind);
            system("cls");
            printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t删除成功...");
            return 1;
        }
        before=before->next;
        behind=behind->next;
    }
    system("cls");
    printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t要删除的数据不存在...");
    return 0;
}
int Modify_information(CLinkNode *head)
{
    system("cls");
    long xx;
    CLinkNode *before=head;
    CLinkNode *behind=head->next;
    printf("输入要修改的学生学号:");
    scanf("%ld",&xx);
    while(behind!=head)
    {
        if(behind->data.num==xx)
        {
            if(behind->next==head)
            {
                before->next=head;
                free(behind);
                InitCLinkList(head);
                system("cls");
                printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t修改成功...");
                return 1;
            }
            before->next = behind->next;
            free(behind);
            InitCLinkList(head);
            system("cls");
            printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t修改成功...");
            return 1;
        }
        before=before->next;
        behind=behind->next;
    }
    system("cls");
    printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t要修改的数据不存在...");
    return 0;
}
void number(CLinkNode *head)
{
    system("cls");
    CLinkNode *p,*q;
    p=head;
    int i;
    long temp;
    float t1,t2,t3,t4;
    char t5[25];
    char t6;
                                        //冒泡排序
    for ( i =1; i<n;i++,p=p->next)
  	 for (q=p->next;q!=head->next;q=q->next)
  		  if (p->data.num>q->data.num)
		    {
                                                    //交换所有信息
		     t1 = p->data.Chinese;
		     p->data.Chinese = q->data.Chinese;
		     q->data.Chinese = t1;

		     t2 = p->data.Math;
		     p->data.Math = q->data.Math;
		     q->data.Math = t2;

             t3 = p->data.English;
		     p->data.English = q->data.English;
		     q->data.English = t3;

		     t4 = p->data.aver;
		     p->data.aver= q->data.aver;
		     q->data.aver = t4;

		     strcpy(t5,p->data.name);
		     strcpy(p->data.name ,q->data.name);
		     strcpy(q->data.name ,t5);

		     temp=p->data.num;
		     p->data.num=q->data.num;
		     q->data.num=temp;

             t6=p->data.sex;
		     p->data.sex=q->data.sex;
		     q->data.sex=t6;
		    }
    printf("学号由低到高排序:\n");
    ShowCLinkList(head);
}
void aver(CLinkNode *head)
{

    CLinkNode *p,*q;
    p=head;
    int i;
    for(i=0;i<n;i++)
    {
        p->data.aver=1.0*(p->data.Chinese + p->data.Math + p->data.English)/3.0;
        p = p->next;
    }
    p=head;
    long temp;
    float t1,t2,t3,t4;
    char t5[25];
    char t6;
                                        //冒泡排序
    for (i=1;i<n;i++,p=p->next)
  	 for (q=p->next;q!=head->next;q=q->next)
  		  if (p->data.aver<q->data.aver)
		    {
                                            //交换所有信息
		     t1 = p->data.Chinese;
		     p->data.Chinese = q->data.Chinese;
		     q->data.Chinese = t1;

		     t2 = p->data.Math;
		     p->data.Math = q->data.Math;
		     q->data.Math = t2;

             t3 = p->data.English;
		     p->data.English = q->data.English;
		     q->data.English = t3;

		     t4 = p->data.aver;
		     p->data.aver= q->data.aver;
		     q->data.aver = t4;

		     strcpy(t5,p->data.name);
		     strcpy(p->data.name ,q->data.name);
		     strcpy(q->data.name ,t5);

		     temp=p->data.num;
		     p->data.num=q->data.num;
		     q->data.num=temp;

             t6=p->data.sex;
		     p->data.sex=q->data.sex;
		     q->data.sex=t6;
		    }
    printf("平均分由高到低排序:\n");
    ShowCLinkList(head);
}

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标签:head,课设,int,改查,next,链表,printf,data,CLinkNode
来源: https://blog.csdn.net/qq_47900759/article/details/120607988