C语言课程设计——学生成绩管理系统

/*头文件*/ #include <stdio.h> #include<dos.h> #include<stdlib.h> /*其它说明*/ #include<string.h> /*字符串函数*/ #include<mem.h> /*内存操作函数*/ #include<ctype.h> /*字符操作函数*/ #include<alloc.h> /*动态地址分配函数*/ #define LEN sizeof(STUDENT) typedef struct stu{ /*定义结构体数组用于缓存数据*/ char num[6]; char name[5]; int score[3]; int sum; float average; int order; struct stu *next; }STUDENT; /*函数原型*/ STUDENT *init(); /*初始化函数*/ int menu_select(); /*菜单函数*/ STUDENT *create(); /*创建链表*/ void print(STUDENT *head); /* 显示全部记录*/ void search(STUDENT *head); /*查找记录*/ STUDENT *delete(STUDENT *head); /*删除记录*/ STUDENT *sort(STUDENT *head); /*排序*/ STUDENT *insert(STUDENT *head,STUDENT *new); /*插入记录*/ void save(STUDENT *head); /*保存文件*/ STUDENT *load(); /*读文件*/ /*主函数界面*/ main() { STUDENT *head,new; head=init(); /*链表初始化,使head的值为NULL*/ for(;;) /*循环无限次*/ { switch(menu_select()) { case 1:head=create();break; case 2:print(head);break; case 3:search(head);break; case 4:head=delete(head);break; case 5:head=sort(head);break; case 6:head=insert(head,&new);break; /*&new表示返回地址*/ case 7:save(head);break; case 8:head=load(); break; case 9:exit(0); /*如菜单返回值为9则程序结束*/ } } } /*初始化函数*/ STUDENT *init() { return NULL; /*返回空指针*/ } /*菜单选择函数*/ menu_select() { int n; struct date d; /*定义时间结构体*/ getdate(&d); /*读取系统日期并把它放到结构体d中*/ printf("press any key to enter the menu......"); /*按任一键进入主菜单*/ getch(); /*从键盘读取一个字符,但不显示于屏幕*/ clrscr(); /*清屏*/ printf("********************************************************************************\n"); printf("\t\t Welcome to\n"); printf("\n\t\t The student score manage system\n"); printf("*************************************MENU***************************************\n"); printf("\t\t\t1. Enter the record\n"); /*输入学生成绩记录*/ printf("\t\t\t2. Print the record\n"); /*显示*/ printf("\t\t\t3. Search record on name\n"); /*寻找*/ printf("\t\t\t4. Delete a record\n"); /*删除*/ printf("\t\t\t5. Sort to make new a file\n"); /*排序*/ printf("\t\t\t6. Insert record to list\n"); /*插入*/ printf("\t\t\t7. Save the file\n"); /*保存*/ printf("\t\t\t8. Load the file\n"); /*读取*/ printf("\t\t\t9. Quit\n"); /*退出*/ printf("\n\t\t Made by Hu Haihong.\n"); printf("********************************************************************************\n"); printf("\t\t\t\t%d\\%d\\%d\n",d.da_year,d.da_mon,d.da_day); /*显示当前系统日期*/ do{ printf("\n\t\t\tEnter your choice(1~9):"); scanf("%d",&n); }while(n<1||n>9); /*如果选择项不在1~9之间则重输*/ return(n); /*返回选择项，主函数根据该数调用相应的函数*/ } /*输入函数*/ STUDENT *create() { int i,s; STUDENT *head=NULL,*p; /* 定义函数.此函数带回一个指向链表头的指针*/ clrscr(); for(;;) { p=(STUDENT *)malloc(LEN); /*开辟一个新的单元*/ if(!p) /*如果指针p为空*/ { printf("\nOut of memory."); /*输出内存溢出*/ return (head); /*返回头指针,下同*/ } printf("Enter the num(0:list end):"); scanf("%s",p->num); if(p->num[0]=='0') break; /*如果学号首字符为0则结束输入*/ printf("Enter the name:"); scanf("%s",p->name); printf("Please enter the %d scores\n",3); /*提示开始输入成绩*/ s=0; /*计算每个学生的总分，初值为0*/ for(i=0;i<3;i++) /*3门课程循环3次*/ { do{ printf("score%d:",i+1); scanf("%d",&p->score[i]); if(p->score[i]<0 || p->score[i]>100) /*确保成绩在0~100之间*/ printf("Data error,please enter again.\n"); }while(p->score[i]<0 || p->score[i]>100); s=s+p->score[i]; /*累加各门成绩*/ } p->sum=s; /*将总分保存*/ p->average=(float)s/3; /*先用强制类型转换将s转换成float型,再求平均值*/ p->order=0; /*未排序前此值为0*/ p->next=head; /*将头结点做为新输入结点的后继结点*/ head=p; /*新输入结点为新的头结点*/ } return(head); } /* 显示全部记录函数*/ void print(STUDENT *head) { int i=0; /* 统计记录条数*/ STUDENT *p; /*移动指针*/ clrscr(); p=head; /*初值为头指针*/ printf("\n************************************STUDENT************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Rec | Num | Name | Sc1 | Sc2 | Sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); while(p) { i++; printf("| %3d | %4s | %-4s | %3d | %3d | %3d | %3d | %4.2f | %-5d|\n", i, p->num,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); p=p->next; } printf("-------------------------------------------------------------------------------\n"); printf("**************************************END**************************************\n"); } /*查找记录函数*/ void search(STUDENT *head) { STUDENT *p; /* 移动指针*/ char s[5]; /*存放姓名用的字符数组*/ clrscr(); printf("Please enter name for searching.\n"); scanf("%s",s); p=head; /*将头指针赋给p*/ while(strcmp(p->name,s) && p) /*当记录的姓名不是要找的，或指针不为空时*/ p=p->next; /*移动指针，指向下一结点*/ if(p) /*如果指针不为空*/ { printf("\n*************************************FOUND************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Num | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d|\n", p->num,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); } else printf("\nThere is no num %s student on the list.\n",s); /*显示没有该学生*/ } /*删除记录函数*/ STUDENT *delete(STUDENT *head) { int n; STUDENT *p1,*p2; /*p1为查找到要删除的结点指针，p2为其前驱指针*/ char c,s[6]; /*s[6]用来存放学号,c用来输入字母*/ clrscr(); printf("Please enter the deleted num: "); scanf("%s",s); p1=p2=head; /*给p1和p2赋初值头指针*/ while(strcmp(p1->num,s) && p1) /*当记录的学号不是要找的，或指针不为空时*/ { p2=p1; /*将p1指针值赋给p2作为p1的前驱指针*/ p1=p1->next; /*将p1指针指向下一条记录*/ } if(strcmp(p1->num,s)==0) /*学号找到了*/ { printf("**************************************FOUND************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Num | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d|\n", p1->num,p1->name,p1->score[0],p1->score[1],p1->score[2],p1->sum,p1->average,p1->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n");