学生成绩管理系统设计(纯C语言,不能有C++,确保最简单最浅显)运行环境VC

2024-12-23 12:48:33
推荐回答(3个)
回答1:

绝对简单的!主函数在最后,看的时候按编译器的工作原理看,超简单!
#ifndef H_STUDENT_HH /*xxx如果没有定义xxx*/
#define H_STUDENT_HH /*xxx定义xx*/

#include "stdio.h"
#include "string.h"
#include "malloc.h"

#define LEN sizeof(struct message_student) /*一个结构体数组元素的长度*/
#define numsubs 5 /*学科数目*/
typedef struct message_student /*结构体定义*/
{
char number[6];
char name[20];
char sex[4];
float subject[numsubs];
float score;
float average;
int index;
}student;

extern int numstus; /*学生数目*/
extern student *pointer; /*指向结构体数组*/
extern int lens;

int menu_select(); /*函数声明*/
int openfile(student stu[]);
int findrecord(student stud[]);
int writetotext(student stud[]);
void welcome();
void display1();
void showtable();
void sort(student stu[]);
void deleterecord(student stu[],int i);
void addrecord(student stud[]);
void display(student stud[],int n1,int n2);
void amendrecord(student stud[]);
void count(student stud[]);
void sortnum(student stud[]);
void sortnum2(student stud[]);
void sortname(student stud[]);
void sortname2(student stud[]);
void sortcount(student stud[]);
void sortcount2(student stud[]);
void statistic(student stud[]);
void display1();

#endif

#include "stdio.h"
int menu_select()
{
char c;
printf("\n\n");
printf(" | 1. 增加学生记录 5.统计信息 |\n");
printf(" | 2. 查询学生记录 6.打开文件 |\n");
printf(" | 3. 修改学生记录 7.保存文件 |\n");
printf(" | 4. 学生纪录排序 8.显示记录 |\n");
printf(" | 0.退出系统 |\n");
printf("\n\n");
printf("请选择(0-8):");
c=getchar();
getchar();
return (c-'0');
}

#include "stdio.h"
int findrecord(student stud[]) /*查找信息*/
{
char str[2];
int i,num;
if(numstus==0)
{
printf("没有可被查找的记录\n");
return -1;
}
else
{
printf("以何种方式查找?\n1.学号\t2.姓名\t3.名次\n");
gets(str);
if(str[0]=='1') /*按学号查找*/
{
printf("请输入学号:");
gets(str);
for(i=0;i<=numstus;i++)
if(strcmp(str,stud[i].number)==0)
{
display(stud,i,i);
break;
}
else continue;
}
else if(str[0]=='2') /*按姓名查找*/
{
printf("请输入姓名:");
gets(str);
for(i=0;i<=numstus;i++)
if(strcmp(str,stud[i].name)==0)
{
display(stud,i,i);
break;
}
else continue;
}
else if(str[0]=='3') /*按名次查找*/
{
printf("请输入名次:");
scanf("%d",&num);
getchar();
for(i=0;i<=numstus;i++)
if(num==stud[i].index)
{
display(stud,i,i);
break;
}
else continue;
}
if(i>numstus)
{
printf("没有查找所要的信息。\n");
return -1;
}
return i;
}
}

#include"stdio.h"
int openfile(student stu[])
{
int i=0,j;
FILE *fp;
char filename[20],str[2];
if(numstus!=0)
{
printf("已经有记录存在,是否保存?(y/n)");
gets(str);
if(str[0]=='y'||str[0]=='Y')
writetotext(stu);
}
printf("请输入文件名:");
gets(filename);
numstus=0;
if((fp=fopen(filename,"rb+"))==NULL)
{
printf("无法打开该文件\n");
return(-1);
}
fscanf(fp,"%d",&numstus);
fgetc(fp);
while(i {
fscanf(fp,"%s",stu[i].number);
fscanf(fp,"%s",stu[i].name);
fscanf(fp,"%s",stu[i].sex);
for(j=0;j fscanf(fp,"%f",&stu[i].subject[j]);
fscanf(fp,"%f",&stu[i].score);
fscanf(fp,"%f",&stu[i].average);
fscanf(fp,"%d",&stu[i].index);
i++;
}
fclose(fp);
printf("文件读取成功\n");
printf("是否显示纪录?(y/n)");
gets(str);
if(str[0]=='y'||str[0]=='Y')
display(stu,0,numstus-1);
return(0);
}
#include "stdio.h"
void sort(student stud[])
{
int i,j=0;
char str[5];
student *p;
p=stud;
if(numstus==0)
{
printf("没有可供查询的记录!");
}
while(1)
{
for(i=0;;i++)
{
printf(" 请输入查询方式:");
printf("(直接输入回车则结束查询操作)\n");
printf("1.按照学号\t");
printf("2.按照姓名\t");
printf("3.按照名次\n");
gets(str);
if(strlen(str)==0) break;
if(str[0]=='1')
{
printf("请输入排序次序:\n");
printf("1.升序排列\t");
printf("2.降序排列\n");
gets(str);
if(str[0]=='1')
sortnum2(p);
else
sortnum(p);
display(stud,0,numstus-1);
}
else if(str[0]=='2')
{
printf("请输入排序次序:\n");
printf("1.升序排列\t");
printf("2.降序排列\n");
gets(str);
if(str[0]=='1')
sortname2(p);
else
sortname(p);
display(stud,0,numstus-1);
}
else if(str[0]=='3')
{
printf("请输入排序次序:\n");
printf("1.升序排列\t");
printf("2.降序排列\n");
gets(str);
if(str[0]=='1')
sortcount2(p);
else
sortcount(p);
display(stud,0,numstus-1);
}
else printf("请输入1~3");
printf("是否退出排序?(y/n)");
gets(str);
if(str[0]=='y'||str[0]=='Y') break;
}
return;
}
}
void sortnum(student stud[])
{
int i,j;
student temp;
student *p;
p=stud;
for(i=0;i for(j=0;j {
if(strcmp(stud[j+1].number,stud[j].number)>0)
{
temp=*(p+j);
*(p+j)=*(p+j+1);
*(p+j+1)=temp;
}
}
}
void sortnum2(student stud[])
{
int i,j;
student temp;
student *p;
p=stud;
for(i=0;i for(j=0;j {
if(strcmp(stud[j].number,stud[j+1].number)>0)
{
temp=*(p+j);
*(p+j)=*(p+j+1);
*(p+j+1)=temp;
}
}
}
void sortname(student stud[])
{
int i,j;
student temp;
student *p;
p=stud;
for(i=0;i for(j=0;j {
if(strcmp(stud[j+1].name,stud[j].name)>0)
{
temp=*(p+j);
*(p+j)=*(p+j+1);
*(p+j+1)=temp;
}
}
}
void sortname2(student stud[])
{
int i,j;
student temp;
student *p;
p=stud;
for(i=0;i for(j=0;j {
if(strcmp(stud[j].name,stud[j+1].name)>0)
{
temp=*(p+j);
*(p+j)=*(p+j+1);
*(p+j+1)=temp;
}
}
}
void sortcount(student stud[])
{
int i,j;
student temp;
student *p;
p=stud;
for(i=0;i for(j=0;j {
if(stud[j+1].index>stud[j].index)
{
temp=*(p+j);
*(p+j)=*(p+j+1);
*(p+j+1)=temp;
}
}
}
void sortcount2(student stud[])
{
int i,j;
student temp;
student *p;
p=stud;
for(i=0;i for(j=0;j {
if(stud[j].index>stud[j+1].index)
{
temp=*(p+j);
*(p+j)=*(p+j+1);
*(p+j+1)=temp;
}
}
}
#include"stdio.h"
void statistic(student stud[]) /*新增功能,输出统计信息*/
{
int i,j=0,k=0;
char c1,str[2];
float average[numsubs],sum=0;
if(numstus==0)
printf("没有可被查找的记录\n");
else
{
while(1)
{
printf("下面将统计考试成绩\n");
printf("请选择你要统计哪科的成绩 1.A\t2.B\t3.C\t4.D\t5.E\n");
c1=getchar();
printf("\t一共有个%d记录\n",numstus); /*总共记录数*/
switch(c1)
{
case '1':
for(i=0;i {
sum+=stud[i].subject[0];
if(stud[k].subject[0]>stud[i].subject[0]) k=i;
if(stud[j].subject[0] }
average[0]=sum/numstus;
printf("\t科目A的最高分:\n"); /*最高分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[j].number,stud[j].name,stud[j].subject[0]);
printf("\t科目A的最低分是:\n"); /*最低分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[k].number,stud[k].name,stud[k].subject[0]);
printf("\t科目A的平均分是 %5.2f\n",average[0]); /*平均分*/
break;
case '2':
for(i=0;i {
sum+=stud[i].subject[1];
if(stud[k].subject[1]>stud[i].subject[1]) k=i;
if(stud[j].subject[1] }
average[1]=sum/numstus;
printf("\t科目B的最高分:\n"); /*最高分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[j].number,stud[j].name,stud[j].subject[1]);
printf("\t科目B的最低分是:\n"); /*最低分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[k].number,stud[k].name,stud[k].subject[1]);
printf("\t科目B的平均分是 %5.2f\n",average[1]); /*平均分*/
break;
case '3':
for(i=0;i {
sum+=stud[i].subject[2];
if(stud[k].subject[2]>stud[i].subject[2]) k=i;
if(stud[j].subject[2] }
average[2]=sum/numstus;
printf("\t科目C的最高分:\n"); /*最高分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[j].number,stud[j].name,stud[j].subject[2]);
printf("\t科目C的最低分是:\n"); /*最低分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[k].number,stud[k].name,stud[k].subject[2]);
printf("\t科目C的平均分是 %5.2f\n",average[2]); /*平均分*/
break;
case '4':
for(i=0;i {
sum+=stud[i].subject[3];
if(stud[k].subject[3]>stud[i].subject[3]) k=i;
if(stud[j].subject[3] }
average[3]=sum/numstus;
printf("\t科目D的最高分:\n"); /*最高分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[j].number,stud[j].name,stud[j].subject[3]);
printf("\t科目D的最低分是:\n"); /*最低分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[k].number,stud[k].name,stud[k].subject[3]);
printf("\t科目D的平均分是 %5.2f\n",average[3]); /*平均分*/
break;
case '5':
for(i=0;i {
sum+=stud[i].subject[4];
if(stud[k].subject[4]>stud[i].subject[4]) k=i;
if(stud[j].subject[4] }
average[4]=sum/numstus;
printf("\t科目E的最高分:\n"); /*最高分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[j].number,stud[j].name,stud[j].subject[4]);
printf("\t科目E的最低分是:\n"); /*最低分*/
printf("\t\t学号:%s 姓名:%s 分数:%.2f\n",stud[k].number,stud[k].name,stud[k].subject[4]);
printf("\t科目E的平均分是 %5.2f\n",average[4]); /*平均分*/
break;
default:printf("输入错误!请输入1~5之间的数\n");
}
sum=0;
getchar();
printf("是否继续进行统计?(y/n)");
gets(str);
if(str[0]=='y'||str[0]=='Y') ;
else break;
}
}
}

#include"stdio.h"
int writetotext(student stud[]) /*将所有记录写入文件*/
{
int i=0,j;
FILE *fp;
char filename[20];
printf("输入文件名称:");
gets(filename);
fp=fopen(filename,"w");
fprintf(fp,"%d\n",numstus);
while(i {
fprintf(fp,"%s %s %s ",stud[i].number,stud[i].name,stud[i].sex);
for(j=0;j fprintf(fp,"%f ",stud[i].subject[j]);
fprintf(fp,"%f %f %d ",stud[i].score,stud[i].average,stud[i].index);
i++;
}
fclose(fp);
printf("已成功存储!\n");
display(stud,0,numstus-1);
numstus=0;
return 0;
}

#include"stdio.h"
void welcome()
{
printf("\t*************************************************************\n");
printf("\t\t\t\t欢迎进入学生成绩管理系统\t\t\t\t\t\t\t\t 晓 欢迎使用!\n");
printf("\t*************************************************************\n");
printf("\t\t\t\t\t\t本系统由“晓”一组亲情制作\n\n");
printf("\t\t\t\t\t\t制作人员列表: \n");
printf("\t\t\t\t\t\t吴彦兵 黄进 汪红波\n\t\t\t\t\t\t刘玉萧 杨超 章耀\n");
printf("输入回车进入菜单栏:\n");
printf("\n\n");
getchar();
}

void showtable()
{
printf("-------------------------------------------------------------------------------\n");
printf("学号\t姓名\t性别\tA\tB\tC\tD\tE 总分 平均分 名次\n");
printf("-------------------------------------------------------------------------------\n");
}

void display(student stud[],int n1,int n2)
{
int i;
showtable(); /*显示表头*/
for(i=n1;i<=n2;i++)
printf("%s\t%s\t%s\t%.1f\t%.1f\t%.1f\t%.1f\t%.1f %.1f %.1f %d\t\n",stud[i].number,stud[i].name,stud[i].sex,stud[i].subject[0],stud[i].subject[1],stud[i].subject[2],stud[i].subject[3],stud[i].subject[4],stud[i].score,stud[i].average,stud[i].index);
/*通过循环输出数据*/

}
void display1()
{
printf("\t\t本系统由晓一组亲情制作\n\n");
printf("\t\t制作人员列表: \n");
printf("\t\t\t\t\t\t吴彦兵 黄进 汪红波\n\t\t\t\t\t\t刘玉萧 杨超 章耀\n");
printf("\t\t\t=========欢迎下次使用=========");
printf("\n\n");
getchar();
}

#include"stdio.h"
#include
void amendrecord(student stud[])
{
char str[5]; /*供用户输入*/
int i=-1,j;

if(numstus==0) /*没有记录返回*/
printf("没有可供修改的记录!");
while(i<0)
{
i=findrecord(stud);
if(i>=0)
{
printf("要删除这个学生的信息吗?(y/n)");
gets(str);
if(str[0]=='y'||str[0]=='Y')
{
deleterecord(stud,i);
count(stud);
}
else
{
printf("确定要修改这个学生的信息吗?(y/n)");
gets(str);
if(str[0]=='y'||str[0]=='Y')
{

printf("下面请重新输入学生的信息:\n");
printf("请输入学号:");
gets(stud[i].number);
printf("请输入姓名:");
gets(stud[i].name);
printf("请输入性别(男/女 1/0):");
gets(str);
if(str[0]=='0')
strcpy(stud[i].sex,"女");
else
strcpy(stud[i].sex,"男");
stud[i].score=0;
printf("请按顺序输入成绩:");
for(j=0;j {
scanf("%f",&stud[i].subject[j]);
stud[i].score+=stud[i].subject[j];
}
getchar();
stud[i].average=stud[i].score/numsubs;
}
count(stud);
}
display(stud,0,numstus-1);
}
printf("是否继续进行其他修改?(y/n)\n");
gets(str);
if(str[0]=='y'||str[0]=='Y')
i=-1;
else i=1;
}
}

void deleterecord(student stu[],int i) /*删除信息*/
{
int j;

while(i>=0)
{
for(j=i;j stu[j]=stu[j+1];
numstus--;
printf("删除成功!\n");

}
}

void count(student stud[])
{
int i,j;
for(i=0;i {
stud[i].index=1;
for(j=0;j if(stud[j].score>stud[i].score)
stud[i].index++;
}
}

#include "stdio.h"
void addrecord(student stud[])
{
int i=0,j,num;
char str[5];
if(numstus!=0)
{
printf("已有记录存在是否覆盖?(y/n)\n");
gets(str);
if(str[0]=='Y'||str[0]=='y')
i=0;
else i=numstus;
}

printf("请输入增加的学生信息条目数:");
scanf("%d",&num);
if(i==0)
numstus=num;
else numstus+=num;
if(numstus>lens)
{
lens+=50;
pointer=(student *)realloc(pointer,lens*LEN);
}
printf("请输入学生信息:\n");
for(;i {
getchar();
printf("请输入学号:");
gets(pointer[i].number);
printf("请输入姓名:");
gets(pointer[i].name);
printf("请输入性别(男/女 1/0):");
gets(pointer[i].sex);
if(pointer[i].sex[0]=='0') strcpy(pointer[i].sex,"女");
else strcpy(pointer[i].sex,"男");
printf("请输入各科成绩:(按ABCDE的顺序):");
stud[i].score=0;
for(j=0;j {
scanf("%f",&stud[i].subject[j]); /*计算总分*/
stud[i].score+=stud[i].subject[j];
}
stud[i].average=stud[i].score/numsubs; /*计算平均分*/
}
count(stud); /*附名次*/
display(stud,0,numstus-1);
getchar();
}
#include "stdio.h"
int numstus;
int lens;
student *pointer;
void main()
{
int i=1;
char str[2];
lens=100;
pointer=(student *)malloc(lens*LEN); /*分配内存*/
numstus=0;
welcome(); /*欢迎界面*/
while(i>0)
{
i=menu_select(); /*控制菜单*/
switch(i)
{
case 1:addrecord(pointer);break; /*增加学生信息*/
case 2:findrecord(pointer);break; /*查询学生信息*/
case 3:amendrecord(pointer);break; /*修改学生信息*/
case 4:sort(pointer);break; /*学生信息排序*/
case 5:statistic(pointer);break; /*统计信息*/
case 6:openfile(pointer);break; /*打开文件*/
case 7:writetotext(pointer);break; /*保存文件*/
case 8:display(pointer,0,numstus-1);break; /*显示记录*/
case 0:
if(numstus!=0) printf("是否保存当前记录?(y/n)");
gets(str);
if(str[0]=='y'||str[0]=='Y')
writetotext(pointer);
i=-1;break; /*退出系统*/
default:printf("请输入数字0~8:\n");i=1; /*输入错误*/
}
}
printf("\t\t======欢迎再次使用本系统======= \n");
display1();
}

回答2:

#include
#include
#include
#include

#define max 20

typedef struct student //学生
{
char sno[max]; // 学号
char sname[max]; //姓名
char sex[max]; //性别
char age[max]; //年龄
char depart[max]; //系
char classs[max]; //班
char grade[max]; //年级

struct student* next;
} student;

student* head;

int LogOn() //登录模块,已实现输入密码不回显,如果中途发现输错某几位,可退格键重输
{
char username[max],password[max];
printf("\n请输入用户名:");
scanf("%s",username);
printf("\n请输入密码(最多15位):");

//开始以不回显且支持退格方式获取输入密码
int i=0;
while((i>=0)&&(password[i++]=getch())!=13)//条件i>=0是用于限制退格的范围
{
if(password[i-1]=='\b')//对退格键的处理
{
printf("%c%c%c",'\b','\0','\b');
i=i-2;
}
else
printf("*");
}
password[--i]='\0';

//已获取密码。验证用户身份
if(!strcmp(username,"zhang")&&!strcmp(password,"8147086"))
{
printf("\n登录成功!");
return 1;
}
else
return 0;

}

void regist()
{
char ch;
student *s,*ptr; //s用来建新结点,ptr用来暂存头结点

do
{

s=(student*)malloc(sizeof(student)); // 新建一个学生结点

printf("\n开始注册..."); //开始注册
printf("\n请输入该学生的学号:");
scanf("%s",s->sno);
printf("\n请输入该学生的姓名:");
scanf("%s",s->sname);
printf("\n请输入该学生的性别:");
scanf("%s",s->sex);
printf("\n请输入该学生的年龄:");
scanf("%s",s->age);
printf("\n请输入该学生的系:");
scanf("%s",s->depart);
printf("\n请输入该学生所在的班:");
scanf("%s",s->classs);
printf("\n请输入该学生所在的年级");
scanf("%s",s->grade);

ptr=head;
head=s;//将新结点插入队头
s->next=ptr;

fflush(stdin);
printf("\n请问是否继续注册?(Y/N)");
scanf("%c",&ch);
}while(ch=='Y'||ch=='y');

return;
}

void ElePrint(char str[]) //输出单个元素
{
if(str==NULL) exit(0);
printf("%s",str);
for(unsigned int i=0;i<12-strlen(str);i++) printf(" ");//为了对齐输出,需插入一些空格
return;
}

int LinePrint(student *ptr) //输出一行
{
if(ptr==NULL) //检查传进来的指针
return 0;

printf("\n");
ElePrint(ptr->sno);
ElePrint(ptr->sname);
ElePrint(ptr->age);
ElePrint(ptr->sex);
ElePrint(ptr->depart);
ElePrint(ptr->classs);
ElePrint(ptr->grade);

return 1;
}

void print() //输出全部学生信息
{
student *ptr=head;
printf("\n学号 姓名 年龄 性别 系 班 年级 ");
while(ptr)
{
LinePrint(ptr);
ptr=ptr->next;
}
printf("\n");
return;
}
void search()//查询模块
{
int method;//查询方式
char no[max],name[max],departm[max],clss[max],grades[max]; //用来接收查询关键字
while(1)
{
printf("\n请选择查询方式");
printf("\n1.按学号查询");
printf("\n2.按姓名查询");
printf("\n3.按所在系查询");
printf("\n4.按所在班级查询");
printf("\n5.按所在年级查询");
printf("\n6.打印全部学生信息");
printf("\n7.返回主菜单\n");

scanf("%d",&method);

student *p=head,*temp;

switch(method)
{
case 1:
printf("\n请输入要查询的学号:");
scanf("%s",no);
while(p)
{
if(!strcmp(p->sno,no))
break;
else
{
temp=p;
p=p->next;
}
}
printf("\n学号 姓名 年龄 性别 系 班 年级 ");
LinePrint(p);
break;
case 2:
printf("\n请输入要查询的姓名:");
scanf("%s",name);
printf("\n学号 姓名 年龄 性别 系 班 年级 ");
while(p)
{
if(!strcmp(p->sname,name))
LinePrint(p);
p=p->next;
}
break;
case 3:
printf("\n请输入学生所在的系:");
scanf("%s",departm);
printf("\n学号 姓名 年龄 性别 系 班 年级 ");
while(p)
{
if(!strcmp(p->depart,departm))
LinePrint(p);
p=p->next;
}
break;
case 4:
printf("\n请输入学生所在的班:");
scanf("%s",clss);
printf("\n请输入学生所在的年级:");
scanf("%s",grades);
printf("\n学号 姓名 年龄 性别 系 班 年级 ");
while(p)
{
if(!strcmp(p->classs,clss)&&!strcmp(p->grade,grades))
LinePrint(p);
p=p->next;
}
break;

case 5:
printf("\n请输入学生所在的年级:");
scanf("%s",grades);
printf("\n学号 姓名 年龄 性别 系 班 年级 ");
while(p)
{
if(!strcmp(p->grade,grades))
LinePrint(p);
p=p->next;
}
break;

case 6:
print();
break;

case 7:
return;
default:
printf("很抱歉,暂无此查询方式!");
break;
}
}

}

void modify()//修改学生信息
{
char num[max];
student *p=head;
printf("\n请输入要修改的学生的学号:");
scanf("%s",num);
while(p)
{
if(!strcmp(p->sno,num))
break;
else
p=p->next;
}
if(p==NULL)
{
printf("\n错误:没有此学生的信息!\n");
return;

}
LinePrint(p);

printf("\n请输入要修改的该学生的信息:");
printf("\n1.姓名");
printf("\n2.性别");
printf("\n3.年龄");
printf("\n4.所在的系");
printf("\n5.所在的班");
printf("\n6.所在的年级");

char name1[max],sex1[max],age1[max],depart1[max],class1[max],grade1[max];
int select;
fflush(stdin);
scanf("%d",&select);
printf("\n请输入新的信息:");

switch(select)
{
case 1:
scanf("%s",name1);
strcpy(p->sname,name1);
break;
case 2:
scanf("%s",sex1);
strcpy(p->sex,sex1);
break;
case 3:
scanf("%s",age1);
strcpy(p->age,age1);
break;
case 4:
scanf("%s",depart1);
strcpy(p->depart,depart1);
break;
case 5:
scanf("%s",class1);
strcpy(p->classs,class1);
break;
case 6:
scanf("%s",grade1);
strcpy(p->grade,grade1);
break;
default:
printf("\nError!");
break;
}

LinePrint(p);
return;
}

void del()// 删除某学生的信息
{
student *p=head,*temp=head,*s;
char num1[max];
printf("\n请输入要删除的学生的学号:");
scanf("%s",num1);
while(p)//查找该学生所在的结点
{
if(!strcmp(p->sno,num1))
break;
else
{
temp=p;
p=p->next;
}

}//while
if(!p)
{
printf("\n不存在此学生的信息.");
return;
}
LinePrint(p);//输出该学生的信息
printf("\n请问真的要删除该学生的信息吗?(Y/N)");
char ch;
fflush(stdin);
scanf("%c",&ch);
if(ch=='Y'||ch=='y')
{
s=p->next;
temp->next=s;
free(p);
printf("\n已经删除该学生的信息.");
}
return;
}

void sort() //排序模块。将学生记录按学号从小到大排列。用起泡排序算法实现
{

student *ptr,*s=head,*p;
int count=0,count1;
while(s)//统计链表结点个数
{
count++;
s=s->next;
}

for(int i=1;i{
ptr=head;
p=NULL;
count1=count-i; //用来控制每轮起泡排序的终点,即每次把学号最小的结点移到倒数第i个结点
while(ptr&&ptr->next&&(count1--))
{
if(strcmp(ptr->sno,ptr->next->sno)>0)
{
s=ptr->next;
ptr->next=s->next;
if(p==NULL) //ptr处于队头时
head=s;
else
p->next=s;
s->next=ptr;
p=s;
}
else
{
ptr=ptr->next;
if(p==NULL) //ptr处于队头时
p=head;
else
p=p->next;
}
}
}
return;
}

void quit()
{
char ch;
printf("\n真的要退出?(Y/N)");
fflush(stdin);
scanf("%c",&ch);
if(ch=='Y'||ch=='y')
exit(0);
return;
}

int main()
{
int option;

printf("\nCopyright@2005 KongXinCai All rights reserved.");
printf("\n欢迎使用学生信息管理系统!\n");

//登录模块
int icheck=0;
while(icheck<3)
{
if(LogOn()==0)
icheck++;
else
break;

}
if(icheck==3)
{
printf("\n连续登录三次不成功,退出!");
exit(0);
}

//系统界面

while(1)
{
printf("\n\n请选择需要的服务:");
printf("\n1.注册");
printf("\n2.查询");
printf("\n3.修改");
printf("\n4.删除");
printf("\n5.排序");
printf("\n7.求平均");
printf("\n6.退出\n");

scanf("%d",&option);

switch(option)
{
case 1:
regist();
break;
case 2:
search();
break;
case 3:
modify();
break;
case 4:
del();
break;
case 5:
sort();
break;
case 6:
quit();
break;
}

}

return 0;

}

回答3:

//我以前写的
#include "stdio.h"
#include "math.h"
#define N 30

struct student
{
long int num;
char name[10];
char sex[3];
int Chinese,Math,English,total,average;
}stu[N]={{4001,"lks","m",100,100,100},{4002,"lyt","w",99,63,89},{4003,"asd","w",60,70,80},{4004,"fgh","m",41,100,98},
{4005,"asd","m",74,74,87},{4006,"yt","m",85,58,78},{4007,"qwe","w",74,100,87},{4008,"dcs","w",74,85,96},
{4009,"qfg","m",74,78,36},{4010,"gft","m",45,85,98},{4011,"mn","m",60,77,17},{4012,"yer","w",78,78,100},{4013,"lsd","m",100,89,85}
},s;
int M=13;
void modify(struct student stu[])
{
int t;
long num;
char z;
t=search(stu)-400;
printf("input num:");
scanf("%ld",&stu[t].num);
printf("input name:");
scanf("%s",stu[t].name);
printf("input sex:");
scanf("%s",stu[t].sex);
printf("input score of Chinese:");
scanf("%d",&stu[t].Chinese);
printf("input score of Math:");
scanf("%d",&stu[t].Math);
printf("input score of English:");
scanf("%d",&stu[t].English);
stu[t].average=(stu[t].English+stu[t].Math+stu[t].Chinese)/3;
stu[t].total=stu[t].English+stu[t].Math+stu[t].Chinese;
printf("\tNUM\tNAME\tSEX\tCHINESE\tMATH\tENGLISH\tTOTAL\tAVERAGE\n");
printf("\t%4ld\t",stu[t].num);
printf(" %s\t",stu[t].name);
printf("%s\t",stu[t].sex);
printf("%4d\t%4d\t%4d\t%4d%8d\n",stu[t].Chinese,stu[t].Math,stu[t].English,stu[t].total,stu[t].average);
printf("Next?y/n???");
scanf("%s",&z);
if (z=='y')
modify(stu);
}
void output(struct student stu[])
{
int i;
printf("\tNUM\tNAME\tSEX\tCHINESE\tMATH\tENGLISH\tTOTAL\tAVERAGE\n");
for (i=0;i {
printf("\t%4ld\t",stu[i].num);
printf(" %s\t",stu[i].name);
printf("%s\t",stu[i].sex);
printf("%4d\t%4d\t%4d\t%4d%8d\n",stu[i].Chinese,stu[i].Math,stu[i].English,stu[i].total,stu[i].average);
}
}
void sort(struct student stu[])
{
int i,j,t;
printf("1.an yingyu chengcheji paixu\n2.an yuwen chengji paixu\n3.an shuxue chengji paixu\n4.an pingjue chengji paixu\n5.an zongfen paixu\n");
scanf("%d",&t);
switch (t)
{
case 1:
for (i=0;i for (j=0;j {
if (stu[j].English {
s=stu[j];
stu[j]=stu[j+1];
stu[j+1]=s;
}
}
output(stu);
getch();
break;
case 2:
for (i=0;i for (j=0;j {
if (stu[j].Chinese {
s=stu[j];
stu[j]=stu[j+1];
stu[j+1]=s;
}
}
output(stu);
getch();
break;
case 3:
for (i=0;i for (j=0;j {
if (stu[j].Math {
s=stu[j];
stu[j]=stu[j+1];
stu[j+1]=s;
}
}
output(stu);
getch();
break;
case 4:
for (i=0;i for (j=0;j {
if (stu[j].average {
s=stu[j];
stu[j]=stu[j+1];
stu[j+1]=s;
}
}
output(stu);
getch();
break;
case 5:
for (i=0;i for (j=0;j {
if (stu[j].total {
s=stu[j];
stu[j]=stu[j+1];
stu[j+1]=s;
}
}
output(stu);
getch();
break;
}
}
int search(struct student stu[])
{
long t,i,z,K='y';
char name[20];
printf("1.an xuehao chazhao\n2.an xingming chazhao\n");
scanf("%d",&z);
switch (z)
{
case 1:
printf("qing shuru xuehao:\n");
scanf("%ld",&t);
for (i=0;i {
if (stu[i].num==t)
{
K='x';
printf("\tNUM\tNAME\tSEX\tCHINESE\tMATH\tENGLISH\tTOTAL\tAVERAGE\n");
printf("\t%4ld\t",stu[i].num);
printf(" %s\t",stu[i].name);
printf(" %s\t",stu[i].sex);
printf("%4d\t%4d\t%4d\t%4d%6d\n",stu[i].Chinese,stu[i].Math,stu[i].English,stu[i].total,stu[i].average);
return(stu[i].num);
getche();
break;
}
}
if (K='y')
{
printf("No find");
getchar();
}
break;
case 2:
printf("qing shuru xingming:");
scanf("%s",name);
for (i=0;i {
if (strcmp(stu[i].name,name)==0)
{
K='x';
printf("\tNUM\tNAME\tSEX\tCHINESE\tMATH\tENGLISH\tTOTAL\tAVERAGE\n");
printf("\t%4ld\t",stu[i].num);
printf(" %s\t",stu[i].name);
printf(" %s\t",stu[i].sex);
printf("%4d\t%4d\t%4d\t%4d%6d\n",stu[i].Chinese,stu[i].Math,stu[i].English,stu[i].total,stu[i].average);
getche();
break;
}
}
if (K='y')
{
printf("No find");
getchar();
}
break;
}
}

void insert(struct student stu[])
{
int i;
char z='y';
for (i=M;i<=N&&z=='y';i++)
{
printf("input num:");
scanf("%ld",&stu[i].num);
printf("input name:");
scanf("%s",stu[i].name);
printf("input name:");
scanf("%s",stu[i].sex);
printf("input score of Chinese:");
scanf("%d",&stu[i].Chinese);
printf("input score of Math:");
scanf("%d",&stu[i].Math);
printf("input score of English:");
scanf("%d",&stu[i].English);
stu[i].average=(stu[i].English+stu[i].Math+stu[i].Chinese)/3;
stu[i].total=stu[i].English+stu[i].Math+stu[i].Chinese;
printf("Next?y/n???");
z=getche();
if (z!='y')
{
M=i+1;
sort(stu);
output(stu);
}
}
}
void delete(struct student stu[])
{
long t,i,z;
char l,name[20];
printf("1.an xuehao shanchu/n2.an xingming chanchu");
scanf("%d",&z);
switch (z)
{
case 1:
printf("qing shuru xuehao:");
scanf("%ld",&t);
for (i=0;i {
if (stu[i].num==t)
{
printf("\tNUM\tNAME\tSEX\tCHINESE\tMATH\tENGLISH\tTOTAL\tAVERAGE\n");
printf("\t%4ld\t",stu[i].num);
printf(" %s\t",stu[i].name);
printf("%s\t",stu[i].sex);
printf("%4d\t%4d\t%4d\t%4d%8d\n",stu[i].Chinese,stu[i].Math,stu[i].English,stu[i].total,stu[i].average);
break;
}
}
printf("Go on?y/n???");
scanf("%s",&l);
if (l=='y')
{
for (;i {
stu[i]=stu[i+1];
}
stu[M-1].num=0;
output(stu);
}
else
break;
case 2:
printf("qing shuru xingming:");
scanf("%s",name);
for (i=0;i {
if (strcmp(stu[i].name,name)==0)
{
printf("\tNUM\tNAME\tSEX\tCHINESE\tMATH\tENGLISH\tTOTAL\tAVERAGE\n");
printf("\t%4ld\t",stu[i].num);
printf(" %s\t",stu[i].name);
printf("%s\t",stu[i].sex);
printf("%4d\t%4d\t%4d\t%4d%8d\n",stu[i].Chinese,stu[i].Math,stu[i].English,stu[i].total,stu[i].average);
break;
}
}
printf("Go on?y/n???");
scanf("%s",&l);
if (l=='y')
{
for (;i {
stu[i]=stu[i+1];
}
stu[M-1].num=0;
output(stu);
}
else
break;
}
}

main()
{
int choice,i;
clrscr();
for (i=0;i {
stu[i].average=(stu[i].English+stu[i].Math+stu[i].Chinese)/3; ;
stu[i].total=stu[i].English+stu[i].Math+stu[i].Chinese;
}
for (;;)
{
printf("\n------ xuesheng chengji guanli xitong------\n");
printf("1.modify xuesheng jilu \n");
printf("2.output xuesheng jilu\n");
printf("3.sort xuesheng jilu\n");
printf("4.search xuesheng jilu\n");
printf("5.insert xuesheng jilu\n");
printf("6.delete xuesheng jilu\n");
printf("7. exit\n");
printf("pllease input(1-7):\n");
scanf("%d",&choice);
switch (choice)
{
case 1:
modify(stu);
break;
case 2:
output(stu);
break;
case 3:
sort(stu);
break;
case 4:
search(stu);
break;
case 5:
insert(stu);
break;
case 6:
delete(stu);
break;
case 7:
exit();
break;
}
}
getch();
}

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