C语言程序设计~~

学生信息包括学号、姓名、考试成绩。试设计一学生成绩管理系统，使之能提供一以下功能：
1.学生成绩录入功能（成绩信息用文件保存）
2.统计：
a.输入学生的学号统计该生的总分及平均分；
b.输入课程求该门课程的平均分。
3.排序：按学号
4.能实现增删改查等功能~~

拜谢~行的话追加积分!!!

大哥，你随便去网站上下一个来，改改小脚本就得了嘛！好像C+里面有自带的几种模块，好像就能改

#include "stdio.h" struct Student { char ID[20]; char Name[20]; float Mark1; float Mark2; float Mark3; float Average; }; struct Student students[1000]; int num=0; float Avg(struct Student stu) { return (stu.Mark1+stu.Mark2+stu.Mark3)/3; } int Student_SearchByIndex(char id[]) { int i; for (i=0;i<num;i++) { if (strcmp(students[i].ID,id)==0) { return i; } } return -1; } int Student_SearchByName(char name[]) { int i; for (i=0;i<num;i++) { if (strcmp(students[i].Name,name)==0) { return i; } } return -1; } void Student_DisplaySingle(int index) { printf("%10s%10s%8s%8s%8s%10s\n","学号","姓名","成绩","成绩","成绩","平均成绩"); printf("-------------------------------------------------------------\n"); printf("%10s%10s%8.2f%8.2f%8.2f%10.2f\n",students[index].ID,students[index].Name, students[index].Mark1,students[index].Mark2,students[index].Mark3,students[index].Average); } void Student_Insert() { while(1) { printf("请输入学号:"); scanf("%s",&students[num].ID); getchar(); printf("请输入姓名:"); scanf("%s",&students[num].Name); getchar(); printf("请输入成绩:"); scanf("%f",&students[num].Mark1); getchar(); printf("请输入成绩:"); scanf("%f",&students[num].Mark2); getchar(); printf("请输入成绩:"); scanf("%f",&students[num].Mark3); getchar(); students[num].Average=Avg(students[num]); num++; printf("是否继续?(y/n)"); if (getchar()=='n') { break; } } } void Student_Modify() { float mark1,mark2,mark3; while(1) { char id[20]; int index; printf("请输入要修改的学生的学号:"); scanf("%s",&id); getchar(); index=Student_SearchByIndex(id); if (index==-1) { printf("学生不存在!\n"); } else { printf("你要修改的学生信息为:\n"); Student_DisplaySingle(index); printf("-- 请输入新值--\n"); printf("请输入学号:"); scanf("%s",&students[index].ID); getchar(); printf("请输入姓名:"); scanf("%s",&students[index].Name); getchar(); printf("请输入成绩:"); scanf("%f",&students[index].Mark1); getchar(); printf("请输入成绩:"); scanf("%f",&students[index].Mark2); getchar(); printf("请输入成绩:"); scanf("%f",&students[index].Mark3); getchar(); students[index].Average=Avg(students[index]); } printf("是否继续?(y/n)"); if (getchar()=='n') { break; } } } void Student_Delete() { int i; while(1) { char id[20]; int index; printf("请输入要删除的学生的学号:"); scanf("%s",&id); getchar(); index=Student_SearchByIndex(id); if (index==-1) { printf("学生不存在!\n"); } else { printf("你要删除的学生信息为:\n"); Student_DisplaySingle(index); printf("是否真的要删除?(y/n)"); if (getchar()=='y') { for (i=index;i<num-1;i++) { students[i]=students[i+1]; } num--; } getchar(); } printf("是否继续?(y/n)"); if (getchar()=='n') { break; } } } void Student_Select() { while(1) { char name[20]; int index; printf("请输入要查询的学生的姓名:"); scanf("%s",&name); getchar(); index=Student_SearchByName(name); if (index==-1) { printf("学生不存在!\n"); } else { printf("你要查询的学生信息为:\n"); Student_DisplaySingle(index); } printf("是否继续?(y/n)"); if (getchar()=='n') { break; } } } void Student_SortByAverage() { int i,j; struct Student tmp; for (i=0;i<num;i++) { for (j=1;j<num-i;j++) { if (students[j-1].Average<students[j].Average) { tmp=students[j-1]; students[j-1]=students[j]; students[j]=tmp; } } } } void Student_Display() { int i; printf("%10s%10s%8s%8s%8s%10s\n","学号","姓名","成绩","成绩","成绩","平均成绩"); printf("-------------------------------------------------------------\n"); for (i=0;i<num;i++) { printf("%10s%10s%8.2f%8.2f%8.2f%10.2f\n",students[i].ID,students[i].Name, students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Average); } } void IO_ReadInfo() { FILE *fp; int i; if ((fp=fopen("Database.txt","rb"))==NULL) { printf("不能打开文件!\n"); return; } if (fread(&num,sizeof(int),1,fp)!=1) { num=-1; } else { for(i=0;i<num;i++) { fread(&students[i],sizeof(struct Student),1,fp); } } fclose(fp); } void IO_WriteInfo() { FILE *fp; int i; if ((fp=fopen("Database.txt","wb"))==NULL) { printf("不能打开文件!\n"); return; } if (fwrite(&num,sizeof(int),1,fp)!=1) { printf("写入文件错误!\n"); } for (i=0;i<num;i++) { if (fwrite(&students[i],sizeof(struct Student),1,fp)!=1) { printf("写入文件错误!\n"); } } fclose(fp); } main() { int choice; IO_ReadInfo(); while(1) { printf("\n------ 学生成绩管理系统------\n"); printf("1. 增加学生记录\n"); printf("2. 修改学生记录\n"); printf("3. 删除学生记录\n"); printf("4. 按姓名查询学生记录\n"); printf("5. 按平均成绩排序\n"); printf("6. 退出\n"); printf("请选择(1-6):"); scanf("%d",&choice); getchar(); switch(choice) { case 1: Student_Insert(); break; case 2: Student_Modify(); break; case 3: Student_Delete(); break; case 4: Student_Select(); break; case 5: Student_SortByAverage(); Student_Display(); break; case 6: exit(); break; } IO_WriteInfo(); } }

楼主是学计算机的吧，我只需要给楼主提示几点就可以了，如果还不明白，请追问

0、用户界面采用烈表式菜单供用户选择操作

1、用结构体存储单个学生的记录

2、多条记录用链接数组方式存储，便于排序和增删

3、建立索引（指针数组）便于计算平均数等（但注意在每次操作后更新索引）

4、代码越简单越好……

大体这样了，楼主试一下，看看是否得到了启发^_^

什么意思。