学生管理系统。

#include<stdio.h>#include<stdlib.h>#include<string.h>#define N 50#define OLDFILE "score.dat"#define NUMFILE "std.dat"#define A VEFILE "sort.dat"#define NEXTFILE "next.dat"typedef struct {int number;char name[20];int score[5];float average;}stu;int readfile(char *file, stu *record);void writefile(char *file, stu *record,int stunum); void mycreate();void display(char *file);void stamenu();void numsort();void stagrade();void managemenu();void makeup_note();void leave_note();void new_list();void avesort();void main() {char choose = 0;do {printf("请选择你需要的服务\n");printf("1. 创建学生记录\n");printf("2. 查询菜单\n");printf("3. 管理菜单\n");printf("4. 文盲慎入\n");printf("0. 退出系统\n");scanf("%c", &choose);switch(choose) {case '1':mycreate();break;case '2':stamenu();break;case '3':managemenu();break;case '4':printf("\n\t\t请自己实现创新功能！");getchar();break;case '0':exit(0);default:printf("\n\t\t%c为非法选项！\n",choose);break;}} while(1);}int readfile(char *file, stu *record){ int i = 0, j = 0;float ave = 0.0;FILE *fp = NULL;fp = fopen(file, "r");if(fp == NULL) {printf("Can't open the file!\n");return -1;}while ((feof(fp)) == 0){fscanf(fp,"%5d%20s", &record[i].number, record[i].name);for(j = 0; j < 5; j++)fscanf(fp, "%5d", &record[i].score[j]);fscanf(fp, "%f\n", &ave);record[i].average = ave;i++;if (i >= N) {printf("读取文件出错, 按任意键并关闭系统!/n");getchar();exit(0);}}fclose(fp);return i;}void writefile(char * file, stu * record, int stunum){int i = 0, j = 0;FILE *fp = NULL;for(i = 0; i < stunum; i++){fprintf(fp, "%5d%20s", record[i].number, record[i].name);for(j = 0; j < 5; j++)fprintf(fp, "%5d", record[i].score[j]);fprintf(fp, "6.1If\n", record[i].average);}fclose(fp);}void mycreate(){int i = 0, j = 0, f = 0, number = 0;char yes_no = '\0';stu record[N] = {0};i = readfile(OLDFILE, record);if (i < 0) {printf("文件为空，请从头创建学生记录! \n");i = 0;}do {if (i >= N) {printf("超出存储范围, 保存并退出输入. \n");break;}printf(" 第%d个学生\n",i+1);do {f = 0;printf("\n 学号:");scanf("%d", &number);for(j = 0; j <= i; j++)if(record[j].number == number) {printf("学号有误, 请重新输入....... \n");f = 1;break;}} while(f == 1);record[i].number = number;printf("\n 姓名:"); scanf("%s",record[i].name);printf("\n 数学成绩:"); scanf("%d", &record[i].score[0]);printf("\n 英语成绩:"); scanf("%d", &record[i].score[1]);printf("\n 物理成绩:"); scanf("%d", &record[i].score[2]);printf("\n 编程成绩:"); scanf("%d", &record[i].score[3]);printf("\n 马哲成绩:"); scanf("%d", &record[i].score[4]);record[i].average=0;i++;getchar();do {printf("\n 要继续吗(Y/N)?\n");scanf("%c", &yes_no);} while(yes_no != 'Y' && yes_no != 'y' && yes_no != 'N' && yes_no!='n');} while(yes_no == 'y'|| yes_no == 'Y');writefile(OLDFILE, record, i);printf("以下是对已输入学生信息的确认!\n");display(OLDFILE);getchar();}void display(char * file){stu student_info[N] = {0};int stu_num = 0, i = 0, j = 0;stu_num = readfile(file, student_info);if (stu_num <= 0 || stu_num > N) {printf("读取文件出错, 按任意键并关闭系统!/n");getchar();exit(0);}for (i = 0; i < stu_num; i++) {printf("学号: %d\n", student_info[i].number);printf("姓名: %s\n", student_info[i].name);printf("各门功课的分数如下: %d\n");printf(" 数学成绩: %d", student_info[i].score[0]);printf(" 英语成绩: %d", student_info[i].score[1]);printf(" 物理成绩: %d", student_info[i].score[2]);printf(" 编程成绩: %d", student_info[i].score[3]);printf(" 马哲成绩: %d", student_info[i].score[4]);printf("平均分: %d", student_info[i].average);}printf("确认完按任意键返回! \n");getchar();}void stamenu(){char choose='\0';do {printf("请选择你需要的选项");printf("1. 按学号排序");printf("2. 按平均分并排序");printf("3. 统计分数段");printf("4. 返回上一层");printf("0. 退出系统");switch(choose) {case '1':numsort();break; /*按学号排序*/case '2':avesort();break; /*计算平均分并排序*/case '3':stagrade();break; /*统计分数段*/case '4':return;case '0':exit(0);default :printf("\n\t\t%c为非法选项！\n", choose);break;}}while(1);}//按学号排列void numsort(){stu student_info[N] = {0};int stu_num = 0, i = 0, j = 0;int num, min, max;stu temp;stu_num = readfile(OLDFILE, student_info);if (stu_num <= 0 || stu_num > N) {printf("读取文件出错, 按任意键并关闭系统!/n");getchar();exit(0);}max = stu_num;min = 0;for (num = max - min; num > 0; num /= 2) {for (i = min + num; i <= max; i += num) {temp = student_info[i];for (j = i - num; j >= 0 && student_info[j].number < temp.number; j -= num) { student_info[j + num].average = student_info[j].average;strcpy(student_info[j + num].name, student_info[j].name);student_info[j + num].number = student_info[j].number;strncpy((char *)student_info[j + num].score, (char *)student_info[j].score, sizeof(student_info[j].score));}student_info[j + num].average = temp.average;strcpy(student_info[j + num].name, );student_info[j + num].number = temp.number;strncpy((char *)student_info[j + num].score, (char *)temp.score, sizeof(student_info[j].score));}}}//按平均成绩排列void avesort(){stu student_info[N] = {0};int stu_num = 0, i = 0, j = 0;int num, min, max;stu temp;stu_num = readfile(OLDFILE, student_info);if (stu_num <= 0 || stu_num > N) {printf("读取文件出错, 按任意键并关闭系统!/n");getchar();exit(0);}max = stu_num;min = 0;for (num = max - min; num > 0; num /= 2) {for (i = min + num; i <= max; i += num) {temp = student_info[i];for (j = i - num; j >= 0 && student_info[j].average < temp.average; j -= num) { student_info[j + num].average = student_info[j].average;strcpy(student_info[j + num].name, student_info[j].name);student_info[j + num].number = student_info[j].number;strncpy((char *)student_info[j + num].score, (char *)student_info[j].score, sizeof(student_info[j].score));}student_info[j + num].average = temp.average;strcpy(student_info[j + num].name, );student_info[j + num].number = temp.number;strncpy((char *)student_info[j + num].score, (char *)temp.score, sizeof(student_info[j].score));}}}void stagrade(){stu record [N] = {0};int i = 0, j, n = 0, count[5][5] = {0};n = readfile(A VEFILE,record);for(i = 0; i < n; i++) /*统计各学科各分数段人数，行表示科目，列表示分数段*/{for(j=0;j<5;j++)if(record[i].score[j]>=90)count[j][0]++;else if(record[i].score[j]>=80 && record[i].score[j]<90)count[j][1]++;else if(record[i].score[j]>=70 && record[i].score[j]<80)count[j][2]++;else if(record[i].score[j]>=60 && record[i].score[j]<70)count[j][3]++;else count[j][4]++;}printf("全班数学成绩如下: \n");for (i = 0; i < 4; i++) {printf("%d 分以上的有%d 人\n", 100 - 10 * i, count[0][i]);}printf("不及格%d 人\n", count[0][i]);printf("全班英语成绩如下: \n");for (i = 0; i < 4; i++) {printf("%d 分以上的有%d 人\n", 100 - 10 * i, count[1][i]);}printf("不及格%d 人\n", count[1][i]);printf("全班物理成绩如下: \n");for (i = 0; i < 4; i++) {printf("%d 分以上的有%d 人\n", 100 - 10 * i, count[2][i]);}printf("不及格%d 人\n", count[2][i]);printf("全班编程成绩如下: \n");for (i = 0; i < 4; i++) {printf("%d 分以上的有%d 人\n", 100 - 10 * i, count[3][i]);}printf("不及格%d 人\n", count[3][i]);printf("全班马哲成绩如下: \n");for (i = 0; i < 4; i++) {printf("%d 分以上的有%d 人\n", 100 - 10 * i, count[4][i]);}printf("不及格%d 人\n", count[4][i]);}void managemenu(){char choose='\0';do {printf("请选择从菜单中选择你需要的选项");printf("1. 生成并打印补考通知单");printf("2. 生成并打印退学通知单");printf("3. 生成并打印新名册");printf("4. 返回上一层");scanf("%c",&choose);switch(choose){case '1':makeup_note();break; /*生成并打印补考通知单*/case '2':leave_note();break; /* 生成并打印退学通知单*/ case '3':new_list();break; /*生成并打印新名册*/case '4':return;case '0':exit(0); /*返回*/default:printf("\n\t\t%c为非法选项!\n", choose);}} while(1);}void makeup_note() {stu record[N]={0};int i=0,j=0,n=0,t=0,count=0,time[5]={0},f=0;char site[5];char sl[6]={0};n = readfile(OLDFILE, record);for(i = 0; i < 5; i++) {switch(i){case 0:strcpy(sl,"数学");break;case 1:strcpy(sl,"英语");break;case 2:strcpy(sl,"物理");break;case 3:strcpy(sl,"编程");break;case 4:strcpy(sl,"马哲");break;}printf("\n\n 请输入科目%s补考时间(偶数的整点时间: 8 - 18点):", sl);do {f=0;scanf("%d",&t);if(t%2!=0) {printf("请输入偶数整点时间：");f=1;continue;}if(t<8 || t>18) {printf("请输入8-18整点时间:");f=1;continue;}for(j=0;j<i;j++)if(t==time[j]) {printf("与其他时间冲突！请重新输入：");f=i;break;}} while(f == 1);time[i] = t;printf("输入%s的补考地点，4位数字的教室号：如1001", sl);scanf("%s", site);site[4] = '\0';printf("%s补考安排信息如下, 按任意键确认! \n", sl);printf("科目: %s, 时间: %d, 教室: %s! \n", sl, time[i], site);getchar();}}void leave_note() {}void new_list(){stu record[N]={0};int i=0,j=0,n=0,count=0;n = readfile(OLDFILE, record);for(i=0;i<n;i++){count=0;for(j=0;j<5;j++)if(record[i].score[j]<60) count++;if(count>3) {for(j=i;j<n-1;j++)record[j]=record[j+1];i--;n--;}}writefile(NEXTFILE,record,n);display(NEXTFILE);}。