C语言学生成绩管理系统

女爷i 2022-06-13 06:36 281阅读 0赞

任务描述  
设计一个学生成绩管理系统，实现对学生成绩的动态管理，实现对学生成绩的输入，显示，删除，查找，插入，最佳，保存，计算，排序等主要功能。  
功能要求  
1、每一条记录包括一个学生的学号、姓名、3门课成绩、平均成绩。  
2、输入功能：可以一次完成若干条记录的输入。  
3、显示功能：完成全部学生记录的显示。  
4、查找功能：完成按姓名查找学生记录，并显示。  
5、排序功能：按学生平均成绩进行排序。  
6、插入功能：按平均成绩高低插入一条学生记录  
7、删除功能：如果输入错误，可以删除学生记录；  
8、退出。

#include<stdio.h>
    #include<stdlib.h>
    #include<string.h>
    #define SIZE_NAME 10
    #define SIZE_ID 20
    
    int Record = 0;
    
    typedef struct {
        char name[SIZE_NAME];
        char id[SIZE_ID];
        int a, b, c;
        int ava;
    }pInfo;
    
    typedef struct node {
        pInfo people;
        struct node *next;
    }linkList;
    
    int menu();
    int create(linkList *head);
    int display(linkList *head);
    int search(linkList *head, char *info);
    int modify(linkList *head, char *pid);
    int add2(linkList *head, char *pid);
    int delt(linkList *head, char *info);
    int compare(int ava1, int ava2);
    int sort(linkList *head, int boolean);//1升序 0降序 
    
    
    int main()
    {
        linkList head, *p;
        char info[SIZE_ID];
        int temp, chus, i;
        head.next = NULL;
    
        while (1) {
            switch (menu()) {
            case 1:
                create(&head);
                break;
            case 2:
                display(&head);
                break;
            case 3:
                printf("请输入需要查询的学号或姓名: ");
                scanf("%s", info);
                p = &head;
                p = p->next;
                for (i = 0; i < search(&head, info); i++) {
                    p = p->next;
                }
                printf("搜索到:\n");
                printf("\t\t\t\t学生信息\n");
                printf("--------------------------------------------------------------------------------\n");
                printf("\t\t学号\t\t姓名\t\t\t平均成绩\n");
                printf("--------------------------------------------------------------------------------\n");
                printf("%20s\t", p->people.id);
                printf("%10s\t", p->people.name);
                printf("%20d\n", p->people.ava);
                break;
            case 4:
                printf("请输入需要修改的学号: ");
                scanf("%s", info);
                modify(&head, info);
                break;
            case 5:
                printf("请输入需要添加的学号: ");
                scanf("%s", info);
                add2(&head, info);
                break;
            case 6:
                printf("请输入需要删除的学号或姓名: ");
                scanf("%s", info);
                delt(&head, info);
                break;
            case 7:
                printf("请输入1或0:\n\t1:升序\n\t0:降序\n");
                scanf("%d", &temp);
                sort(&head, temp);
                break;
            case 8:
                exit(0);
                break;
            default:
                printf("输错了，再来一次\n");
            }
            system("pause");
            system("cls");
        }
        system("pause");
        return 0;
    }
    
    int menu()
    {
        int chus;
        printf("\t学生信息\n\n");
        printf("请输入(1 -- 8):\n");
        printf("\t1.创建学生信息\n");
        printf("\t2.显示学生信息\n");
        printf("\t3.查询学生信息\n");
        printf("\t4.修改学生信息\n");
        printf("\t5.添加学生信息\n");
        printf("\t6.删除学生信息\n");
        printf("\t7.排序学生成绩\n");
        printf("\t8.退出\n");
        scanf("%d", &chus);
        return chus;
    }
    
    int create(linkList *head)
    {
        linkList *s, *p;
        p = head;
        printf("请输入学号 姓名 三科成绩,输入end结束\n");
        while (1) {
            s = (linkList*)malloc(sizeof(linkList));
            scanf("%s", s->people.id);
            if (!strcmp(s->people.id, "end")) {
                return 0;
            }
            scanf("%s", s->people.name);
            scanf("%d", &s->people.a);
            scanf("%d", &s->people.b);
            scanf("%d", &s->people.c);
            s->people.ava = (s->people.a + s->people.b + s->people.c) / 3;
    
            s->next = p->next;
            p->next = s;
            p = s;
            Record++;
        }
        return 0;
    }
    
    int display(linkList *head)
    {
        int i;
        linkList *p;
        p = head;
        p = p->next;
        printf("\t\t\t\t学生信息\n");
        printf("--------------------------------------------------------------------------------\n");
        printf("\t\t学号\t\t姓名\t\t\t平均成绩\n");
        printf("--------------------------------------------------------------------------------\n");
        for (i = 0; i < Record; i++, p = p->next) {
            printf("%20s\t", p->people.id);
            printf("%10s\t", p->people.name);
            printf("%20d\n", p->people.ava);
        }
    
        return 0;
    }
    
    int search(linkList *head, char *info)
    {
        int i;
        linkList *p;
        p = head;
        p = p->next;
        for (i = 0; i < Record; i++, p = p->next) {
            if ((!strcmp(p->people.id, info)) || (!strcmp(info, p->people.name))) {
                return i;
            }
        }
        return -1;
    }
    
    int modify(linkList *head, char *pid)
    {
        int i;
        linkList *p;
        p = head;
        p = p->next;
        for (i = 0; i < search(head, pid); i++) {
            p = p->next;
        }
        printf("请输入新信息:\n");
        scanf("%s", p->people.id);
        scanf("%s", p->people.name);
        scanf("%d", &p->people.a);
        scanf("%d", &p->people.b);
        scanf("%d", &p->people.c);
        p->people.ava = (p->people.a + p->people.b + p->people.c) / 3;
        return 0;
    }
    
    int add2(linkList *head, char *pid)
    {
        int i;
        linkList *p, *s;
        p = head;
        p = p->next;
        s = (linkList*)malloc(sizeof(linkList));
        while (p->next != NULL) {
            p = p->next;
        }
        printf("请输入需要添加的姓名和成绩:\n");
        strcpy(s->people.id, pid);
        scanf("%s", s->people.name);
        scanf("%d", &s->people.a);
        scanf("%d", &s->people.b);
        scanf("%d", &s->people.c);
        s->people.ava = (s->people.a + s->people.b + s->people.c) / 3;
        if (search(head, s->people.id) == -1) {
            s->next = p->next;
            p->next = s;
            Record++;
        }
        else {
            printf("学号重复了\n");
        }
        sort(head, 0);
        return 0;
    }
    
    int delt(linkList *head, char *info)
    {
        int i, n;
        linkList *p, *s;
        p = head;
        n = search(head, info);
        if (-1 == n) {
            printf("没有找到\n");
            return 0;
        }
        for (i = 0; i < n; i++) {
            p = p->next;
        }
        p->next = p->next->next;
        Record--;
        return 0;
    }
    int compare(int ava1, int ava2)
    {
        if (ava1 < ava2) {
            return 1;
        }
        return 0;
    }
    
    int sort(linkList *head, int boolean)
    {
        linkList *p, *pre;
        pInfo temp;
        if (boolean) {
            for (p = head->next; p != NULL; p = p->next) {
                for (pre = p->next; pre != NULL; pre = pre->next) {
                    if (0 == compare(p->people.ava, pre->people.ava)) {
                        temp = p->people;
                        p->people = pre->people;
                        pre->people = temp;
                    }
                }
            }
        }
        else {
            for (p = head->next; p != NULL; p = p->next) {
                for (pre = p->next; pre != NULL; pre = pre->next) {
                    if (1 == compare(p->people.ava, pre->people.ava)) {
                        temp = p->people;
                        p->people = pre->people;
                        pre->people = temp;
                    }
                }
            }
        }
        return 0;
    }