编写一个c语言程序，统计一个班(最多50人)的学生成绩（在vc下编写）

[weivs929]

刚开始学这个 ，有很多地方不懂 望高手赐教！
1.由键盘输入每个学生的学号。姓名和四门成绩
2.计算每个学生的平均分和总分
3.按部分排序（从高到底）并按名次输出
4.根据要求输出某门功课（由键盘输入课程号）成绩在90分以上（包括90分）的学生概况
具体要求
1，每个功能为一个独立的函数
2.所有的键盘输入要求提示

[zxg_1023]

//建议定义个结构体：
typedef score{
   int number;
   char name[MAX_NAME_LENTH];
   float score1;
   float score2;
   float score3;
   float score4;
}t_score;

//同时还有宏定义：
#define MAX_NAME_LENTH 50
#define MAX_STUDENT 100

//定义一个数组
t_score Student[MAX_STUDENT];
//初始化
memset(Student, 0, MAX_STUDENT*sizeof(t_score));

//输入信息，只是参考
scanf("%d", &(Student[i].number));
scanf("%s", &(Student[i].name));
scanf("%f", &(Student[i].score1));
scanf("%f", &(Student[i].score2));
scanf("%f", &(Student[i].score3));
scanf("%f", &(Student[i].score4));

//求某门成绩的平均分和总分就用循环对某门分数进行累加

//排序的方法一般C语言的书里都有介绍，按照某一门成绩排就行了

//第四个也简单，就循环判断某门成绩是否>=90就行了

呵呵，时间不多，只是大体上说下，洗澡——睡觉——

[macfan]

贴个,人数什么的要求修改下人数变量就行了.
什么项目要还是不要添加删除就行了.

#include<iostream>
#include<iomanip>
using namespace std;
    
	const int consureN=5;//每人的信息量
	const int LINE=3;//学生的人数
	int score[LINE][consureN];
	char zifu[][5]={"学号",
		             "班级",
					 "语文",
					 "数学",
					 "英语"};
	int allscore[LINE];
	int pingjun[3];


void main()
{
	 //Input();
	 // all();
	 //paiming();
  	// pingjunfen();
    for(int i=0;i<LINE;i++)
	{
		for(int j=0;j<consureN;j++)
		{
			cout<<zifu[j]<<":"<<"\t";
			cin>>score[i][j];//输入3个人每个人的信息,没人5条信息,全部为INT型,
			                 //输入第一个学生的存入score[0][0],.....
		}
            cout<<endl;

	}


	for (int g=0;g<LINE;g++)
	allscore[g] = 0;//全部初始化为0
     for(int x=0;x<LINE;x++)
	   {
          for(int j=2;j<consureN;j++)
		  {
             allscore[x]=score[x][j]+allscore[x];//除了学号信息全部相加
		  }
	   }


	 for(int k=0;k<LINE;k++)
	pingjun[k]=allscore[k]/(consureN-2);//得到三个人的平均分,赋值给PJ123


     for(int s=0;s<LINE;s++)
		{
	    	for(int j=s+1;j<LINE;j++)
			{
			   if(allscore[s]<allscore[j])
			   {
		     	int t;
		    	t=allscore[s];
		    	allscore[s]=allscore[j];
		     	allscore[j]=t;//交换数组,按从大到小排序
			   }
			}
		}

	 cout<<"排名"<<"\t"<<"学号"<<"\t\t"<<"班级"<<"\t"<<"语文"<<"\t"<<"数学"<<"\t"<<"英语"<<"\t"<<"平均分"<<"\t\t"<<"总分"<<endl;
	 cout<<"********************************************************************************"<<endl;
	 
	 for(int w=0;w<LINE;w++)
	 {
		 int s=0;
       cout<<w+1<<"\t"<<score[w][s]<<"\t\t"<<score[w][s+1]<<"\t"<<score[w][s+2]<<"\t"<<score[w][s+3]<<"\t"<<score[w][s+4]<<"\t"<<pingjun[w]<<"\t\t"<<allscore[w]<<endl;
	 }
}

[oxiaoano]

不错。

[weivs929]

谢啦 不过还是不太明白的 我的想法是选用一个主函数 然后把每个独立的函数作为子函数时行编写的。至于结构体那些我还会的 。主要是缺少整体的框架吧 。

[K行天下]

[Quote=引用楼主 weivs929 的帖子:]
刚开始学这个 ，有很多地方不懂 望高手赐教！
1.由键盘输入每个学生的学号。姓名和四门成绩
2.计算每个学生的平均分和总分
3.按部分排序（从高到底）并按名次输出
4.根据要求输出某门功课（由键盘输入课程号）成绩在90分以上（包括90分）的学生概况
具体要求
1，每个功能为一个独立的函数
2.所有的键盘输入要求提示
[/Quote]

void menu()
{
 printf("1. 输入学生信息\n");
 prinf("2 .
...
printf("0. 退出
...
}
int main()
{
   int n;
   int over = 0;
   while(!over)
{
    scanf("%d",n);

    switch(n)
    {

    case 1: input();
         break;
case 2:
...
case 0: over = 1; break;

[weivs929]

本人刚学这个理解有限~还是请大虾写个完整的让我参考吧 不胜感激！！！

[kgduwu]

俺也贴一个,只有学号,姓名,语文,数学,英语,平均成绩,进行学号唯一检查与排序,进行平均成绩排序,可增加,修改,统计学生数量,查看全部学生信息,可存盘读盘,读盘时将盘中的记录数据是否正确,并可选择是将盘中的信息读取并附加到内存中的信息表尾部,还是先清除内存中的信息表后直接读取盘中的信息,如果学号重复时可选择保留内存中的记录还是盘中的记录,供参考!
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct student * create(struct student *);
int funcsele(void);
struct student * app(struct student *);
struct student * load(struct student *);
struct student * edit(struct student *);
struct student * del(struct student *);
void cout(struct student *);
struct student * print(struct student *);
struct student * sort(struct student *);
struct student * nosort(struct student *);
struct student * aversort(struct student *);
bool save(struct student *);
bool freelikst(struct student *);
float avera(float a,float b,float c);
struct student * check(int studentno,struct student *head);
bool scorcecheck(float a);
float scorceinput(void);
struct student * nodedel(struct student *,struct student *);
struct student * readcheck(struct student *,FILE *);

struct SCORCE
{
float chin;
float math;
float engl;
};
struct student
{
int stu_no;
char stu_name[20];
SCORCE sco;
float aver;
struct student *next;
};

struct headnode
{
struct student *head;
};


void main()
{
int sele;
char creat,ext;
bool fileflag = true;
struct student *h;
h = NULL;
printf("学生成绩管理信息系统初始: 创建（请按c）,装载（请按l），放弃退出（请按a）？: ");
creat = getchar();
if(creat == 'c')
h = create(h);
else if(creat == 'l')
h = load(h);
else if(creat == 'a')
{
printf("你已放弃了学生成绩管理信息系统的建立，程序即将退出！");
exit(1);
}
if(h == NULL)
{
printf("学生成绩管理信息系统初始创建或磁盘装载不成功，程序即将退出！");
exit(1);
}
do
{
sele = funcsele();
switch(sele)
{
case 0:
exit(1);
case 1:
h = app(h);
break;
case 2:
h = load(h);
break;
case 3:
h = edit(h);
break;
case 4:
h = del(h);
break;
case 5:
cout(h);
break;
case 6:
h = print(h);
break;
case 7:
h = sort(h);
break;
case 8:
fileflag = save(h);
if(fileflag)
printf("保存完成！\n");
break;
}
fflush(stdin);
printf("是否退出？y/n? : ");
ext = getchar();
if(ext == 'y')
exit(1);
}while(ext != 'y');
exit(1);
}

struct student * create(struct student *head)
{
struct student *checkflag;
struct student *p;
struct student *tail;
char name[20],flag = 'y';
// float average;
// head = NULL;
checkflag = NULL;
p = NULL;
tail = NULL;
while(flag == 'y')
{
p = (struct student *)malloc(sizeof(struct student));
if(p == NULL)
{
printf("内存申请失败！\n");
exit(1);
}
else
{
do
{
printf("请输入学生学号：");
fflush(stdin);
scanf("%3d",&(p->stu_no));
if(head != NULL)
{
checkflag = check(p->stu_no,head);
if(checkflag != NULL)
printf("学生学号重复，请重新输入！\n");
}
}while(checkflag != NULL);
fflush(stdin);
// printf("学生学号：%d",p->stu_no);
printf("请输入学生姓名：");
gets(name);
// printf("\n学生姓名：%s",name);
strcpy(p->stu_name,name);
printf("请输入学生语文成绩：");
p->sco.chin = scorceinput();
printf("请输入学生数学成绩：");
p->sco.math = scorceinput();
printf("请输入学生英语成绩：");
p->sco.engl = scorceinput();
p->aver = avera(p->sco.chin,p->sco.math,p->sco.engl);
printf("\n");
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
printf("%d\t%s\t%f\t%f\t%f\t%f\n",p->stu_no,p->stu_name,p->sco.chin,p->sco.math,p->sco.engl,p->aver);
if(head == NULL)
{
head = p;
tail = p;
tail->next = NULL;
}
else
{
tail->next = p;
tail = p;
tail->next = NULL;
}
}
printf("是否打算继续输入？是/否(y/n)？: ");
fflush(stdin);
flag = getchar();
}
if(head != NULL)
{
// tail->next = NULL;
printf("系统初始创建结束\n");
}
return head;
}

int funcsele()
{
int func = 1;
printf("\n学生成绩管理功能项目选择：[1，2，3，4，5，6，7，8，0]\n");
printf("追加学生信息至表尾：请选：1\n");
printf("从磁盘装载一个学生信息表至内存：请选：2\n");
printf("修改表中学生信息：请选：3\n");
printf("删除表中学生信息：请选：4\n");
printf("统计表中学生数量：请选：5\n");
printf("查看表中学生信息：请选：6\n");
printf("排序学生平均成绩：请选：7\n");
printf("保存学生信息表到磁盘：请选：8\n");
printf("退出：请选：0\n");
do
{ printf("你的选择是：");
fflush(stdin);
scanf("%d",&func);
if(!((func >= 0)&&(func <= 8)))
printf("选择有误，请重新输入\n");
}
while(!((func >= 0)&&(func <= 8)));


return func;

}

struct student * app(struct student *a)
{
struct student *head;
struct student *checkflag;
struct student *p;
struct student *tail;
char name[20],flag = 'y';
// float average;
head = a;
checkflag = NULL;
p = NULL;
tail = NULL;
while(flag == 'y')
{
p = (struct student *)malloc(sizeof(struct student));
if(p == NULL)
{
printf("内存申请失败！\n");
exit(1);
}
else
{
do
{
printf("请输入学生学号：");
fflush(stdin);
scanf("%3d",&(p->stu_no));
if(head != NULL)
{
checkflag = check(p->stu_no,head);
if(checkflag != NULL)
printf("学生学号重复，请重新输入！\n");
}
}while(checkflag != NULL);
fflush(stdin);
// printf("学生学号：%d",p->stu_no);
printf("请输入学生姓名：");
gets(name);
// printf("\n学生姓名：%s",name);
strcpy(p->stu_name,name);
printf("请输入学生语文成绩：");
p->sco.chin = scorceinput();
printf("请输入学生数学成绩：");
p->sco.math = scorceinput();
printf("请输入学生英语成绩：");
p->sco.engl = scorceinput();
p->aver = avera(p->sco.chin,p->sco.math,p->sco.engl);
printf("\n");
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
printf("%d\t%s\t%f\t%f\t%f\t%f\n",p->stu_no,p->stu_name,p->sco.chin,p->sco.math,p->sco.engl,p->aver);
if(head == NULL)
{
head = p;
tail = head;
// head->next = NULL;
tail->next = NULL;
}
else
{
if(head->next == NULL)
{
head->next = p;
tail = p;
tail->next = NULL;
}
else
{
tail = head->next;
while(tail->next != NULL)
{
tail = tail->next;
}
tail->next = p;
tail = p;
tail->next = NULL;
}
}
}
printf("是否打算继续追加？是/否(y/n)？: ");
fflush(stdin);
flag = getchar();
}
//if(head != NULL)
// {
// tail->next = NULL;
// }
return head;
}

struct student * print(struct student *head)
{
// struct student *head;
struct student *p;
// struct student *tail;
char t = 'n';
// head = l;
p = NULL;
// tail = NULL;
do
{
if(head == NULL)
{
printf("学生成绩管理信息系统数据为空\n");
printf("学生成绩管理信息系统数据: 创建（请按c）,装载（请按l），放弃退出（请按a或其它键）？: ");
fflush(stdin);
t = getchar();
if(t == 'y')
head = create(head);
else if(t == 'l')
head = load(head);
else
{
printf("你已放弃了学生成绩管理信息系统的再建立或装载，程序即将退出！\n");
exit(1);
}
if(head == NULL)
{
printf("学生成绩管理信息系统的再建立或装载失败，程序即将退出！");
exit(1);
}
}
}while(head == NULL);
p = head;
printf("*********学生成绩管理信息系统表*********\n");
printf("*****************************************\n");
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
do
{
printf("%d\t%s\t%f\t%f\t%f\t%f\n",p->stu_no,p->stu_name,p->sco.chin,p->sco.math,p->sco.engl,p->aver);
if(p->next == NULL)
{
p = NULL;
}
else
p = p->next;
}while(p != NULL);
printf("*********显示完成！*********\n");
return head;
}

void cout(struct student *head)
{
int i,num;
if(head == NULL)
{
num = 0;
}
else
{
num = 1;
for(i = 2;head->next != NULL;i++)
{
head = head->next;
num = i;
}

}
printf("学生总人数为：%d 个！\n",num);
}

[kgduwu]

struct student * del(struct student *head)
{
struct student *p;
struct student *pnext;
struct student *checkflag;
int stuno,t;
char delflag,delaskflag,restartflag = 'n',abortflag = 'n';
checkflag = NULL;
p = head;
pnext = head;
if(head == NULL)
{
printf("学生成绩管理信息系统数据为空,没有数据可供删除，请选择其它功能项目！\n");
goto end;
}
else
restart:
do
{
// if(head != NULL)
// {
printf("请输入你要删除的学生学号： ");
fflush(stdin);
scanf("%3d",&stuno);
checkflag = check(stuno,head);
if(checkflag == NULL)
{
printf("你输入的学生学号%3d不存在，重新输入请按y,放弃删除请按其它键！\n",stuno);
fflush(stdin);
abortflag = getchar();
if(abortflag != 'y')
goto end;
}
// }
}while(checkflag == NULL);
printf("你要删除的学号为%3d的学生信息如下:\n",stuno);
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
printf("%d\t%s\t%f\t%f\t%f\t%f\n",checkflag->stu_no,checkflag->stu_name,checkflag->sco.chin,checkflag->sco.math,checkflag->sco.engl,checkflag->aver);
printf("你确认要删除学号为%3d的学生信息吗？是/否（y/n）？: ",stuno);
fflush(stdin);
delaskflag = getchar();
if(delaskflag != 'y')
{
printf("你是否打算删除其它学号的学生信息吗？是/否（y/n）？ :");
fflush(stdin);
restartflag = getchar();
if(restartflag == 'y')
goto restart;
else
goto end;
}
else
{
do
{
if(pnext != checkflag)
{

p = pnext;
pnext = pnext->next;
t = 0;

}
else
{
if(pnext == head)
{
head = pnext->next;
p = pnext->next;
pnext = pnext->next;
t = 1;
if(head == NULL)
{
printf("学号为%3d的学生信息删除完成！ \n",stuno);
printf("现学生成绩管理信息系统数据为空,没有数据可供删除，请选择其它功能项目！\n");
goto end;
}
}
else
{
p->next = pnext->next;
t = 1;
p = head;
pnext = head;
}
printf("学号为%3d的学生信息删除完成！ \n",stuno);
free(checkflag);
}
}while(t != 1);

printf("你是否还要删除其他学生的信息？是/否（y/n）？: ");
fflush(stdin);
delflag = getchar();
if(delflag == 'y')
goto restart;
end:
return head;
}
}

struct student * edit(struct student *head)
{
struct student *p;
struct student *checkflag;
int stuno;
char name[20];
checkflag = NULL;
p = NULL;
char editflag,editaskflag,restartflag = 'n',abortflag = 'n';
if(head == NULL)
{
printf("学生成绩管理信息系统数据为空,没有数据可供修改，请选择其它功能项目！\n");
goto end;
}
else
restart:
do
{
printf("请输入你要修改的学生学号： ");
fflush(stdin);
scanf("%3d",&stuno);
checkflag = check(stuno,head);
if(checkflag == NULL)
{
printf("你输入的学生学号%3d不存在，重新输入请按y,放弃修改请按其它键！\n",stuno);
fflush(stdin);
abortflag = getchar();
if(abortflag != 'y')
goto end;
}
}while(checkflag == NULL);
p = checkflag;
printf("你要修改的学号为%3d的学生信息如下:\n",stuno);
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
printf("%d\t%s\t%f\t%f\t%f\t%f\n",checkflag->stu_no,checkflag->stu_name,checkflag->sco.chin,checkflag->sco.math,checkflag->sco.engl,checkflag->aver);
printf("你确认要修改学号为%3d的学生信息吗？是/否（y/n）？: ",stuno);
fflush(stdin);
editaskflag = getchar();
if(editaskflag != 'y')
{
printf("你是否打算修改其它学号的学生信息吗？是/否（y/n）？ :");
fflush(stdin);
restartflag = getchar();
if(restartflag == 'y')
goto restart;
else
goto end;
}
fflush(stdin);
printf("请输入你要修改的学号为%3d的学生的姓名：",stuno);
gets(name);
strcpy(p->stu_name,name);
printf("请输入你要修改的学号为%3d的学生的语文成绩：",stuno);
p->sco.chin = scorceinput();
printf("请输入你要修改的学号为%3d的学生的数学成绩：",stuno);
p->sco.math = scorceinput();
printf("请输入你要修改的学号为%3d的学生的英语成绩：",stuno);
p->sco.engl = scorceinput();
p->aver = avera(p->sco.chin,p->sco.math,p->sco.engl);
printf("\n");
printf("你修改后的学号为%3d的学生信息如下:\n",stuno);
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
printf("%d\t%s\t%f\t%f\t%f\t%f\n",p->stu_no,p->stu_name,p->sco.chin,p->sco.math,p->sco.engl,p->aver);
printf("你是否还要修改其他学生的信息？是/否（y/n）？: ");
fflush(stdin);
editflag = getchar();
if(editflag == 'y')
goto restart;
end:
return head;
}
struct student * sort(struct student *head)
{
struct student *h;
struct student *pnext;
int sele = 0;
h = head;
pnext = head;
if(head == NULL)
{
printf("学生成绩管理信息系统数据为空,请选择其它功能项目！\n");
goto end;
}
printf("请选择排序索引：[2，1，0]\n");
printf("以学号由小到大排序：请选：1\n");
printf("以学生平均成绩由高到低排序：请选：2\n");
printf("放弃排序：请选：0\n");
do
{ printf("你的选择是：");
fflush(stdin);
scanf("%d",&sele);
if(!((sele >= 0)&&(sele <= 2)))
printf("选择有误，请重新输入\n");
}
while(!((sele >= 0)&&(sele <= 2)));
switch(sele)
{
case 0:
goto end;
case 1:
head = nosort(h);
printf("以学号由小到大排序完成！\n");
break;
case 2:
head = aversort(h);
printf("以学生平均成绩由低到高排序完成！\n");
break;
}
end:
return head;

}


float avera(float a,float b,float c)
{
float avera = (float)((a + b + c)/3.0);
return avera;
}

struct student * check(int studentno,struct student *head)
{
struct student *p;
p = head;
while(studentno != p->stu_no)
{
p = p->next;
if(p == NULL)
break;
}
return p;
}
struct student * nosort(struct student *h)
{
struct headnode headbak;
struct student *p,*q,*temp,*temp1,*temp2,*temp3,*temp4;
int relaflag = 0,sortflag = 0,t =0;
headbak.head = h;
p = h;
q = NULL;
if(p != NULL)
{
q = h->next;
}
else
{
q = NULL;
}
if(q == NULL)
{
headbak.head = h;
}
else
{
while(p->next)
{
relaflag = 0;
while(q)
{
if(p->stu_no >= q->stu_no)
t = 1;
else
t = 0;
switch(t)
{
case 1:
{
{
if(relaflag ==0)
{
temp = p;
temp1 = q->next;
p = q;
q = temp;
p->next = temp;
q->next = temp1;

}
else
{
temp = p;
temp1 = q->next;
temp2->next = p;
temp3 = p->next;
p = q;
q = temp;
p->next = temp3;
q->next = temp1;
}
}
}
case 0:
temp2 = q;
q = q->next;
relaflag = (++relaflag);
if(sortflag == 0)
headbak.head = p;

}
}
if(sortflag == 0)
temp4 = p;
else
{
temp4->next = p;
temp4 = temp4->next;
}
p = p->next;
sortflag = (++sortflag);
q = p->next;
}
}
return headbak.head;
}
struct student * aversort(struct student *h)
{
struct headnode headbak;
struct student *p,*q,*temp,*temp1,*temp2,*temp3,*temp4;
int relaflag = 0,sortflag = 0,t =0;
headbak.head = h;
p = h;
q = NULL;
if(p != NULL)
{
q = h->next;
}
else
{
q = NULL;
}
if(q == NULL)
{
headbak.head = h;
}
else
{
while(p->next)
{
relaflag = 0;
while(q)
{
if(p->aver >= q->aver)
t = 1;
else
t = 0;
switch(t)
{
case 1:
{
{
if(relaflag ==0)
{
temp = p;
temp1 = q->next;
p = q;
q = temp;
p->next = temp;
q->next = temp1;

}
else
{
temp = p;
temp1 = q->next;
temp2->next = p;
temp3 = p->next;
p = q;
q = temp;
p->next = temp3;
q->next = temp1;
}
}
}
case 0:
temp2 = q;
q = q->next;
relaflag = (++relaflag);
if(sortflag == 0)
headbak.head = p;

}
}
if(sortflag == 0)
temp4 = p;
else
{
temp4->next = p;
temp4 = temp4->next;
}
p = p->next;
sortflag = (++sortflag);
q = p->next;
}
}
return headbak.head;
}

[kgduwu]

bool save(struct student *head)
{
FILE *fp;
struct student *p;
char filename[10];
int count = 0;
p = head;
if(p == NULL)
{
printf("该文件为空，保存出错！\n ");
return(false);
}
printf("请输入你要保存的文件名（8字节以内）： ");
scanf("%s",filename);
if((fp = fopen(filename,"wb")) == NULL)
{
printf("文件指针未能打开，保存失败!\n");
return(false);
}
else
{
while(p)
{
fwrite(p,sizeof(struct student),1,fp);
count = ++count;
p = p->next;
}
printf("共要保存 %d 个的学生的信息!\n",count);
fclose(fp);
return(true);
}

}

struct student * load(struct student *head)
{
FILE *fp;
struct student *p;
char filename[16],flag = 'n';
bool saveflag = false;
p = head;
if(p != NULL)
{
printf("内存中当前学生信息不为空，尾部附加文件装载失败或清空当前文件重新装载都将丢失当前学生信息，是否先备份当前学生信息到磁盘？( y/n : ?) : \n");
fflush(stdin);
flag = getchar();
if(flag == 'y')
{
saveflag = save(p);
if(saveflag)
printf("保存完成,请继续！\n");
}
reinput:
fflush(stdin);
printf("请输入你要装载的文件名（8字节以内）： ");
scanf("%s",filename);
if((fp = fopen(filename,"rb")) == NULL)
{
printf("无法打开该文件，文件不存在或文件错误，重新输入（请按y），放弃装载（请按n或其它键）！y/n? : \n");
fflush(stdin);
flag = getchar();
if(flag == 'y')
{
goto reinput;
}
else
{
printf("无法打开该文件，你已放弃装载！\n");
return(head);
}
}
printf("装载该文件到当前文件尾部(请按y)，清空内存中学生信息重新装载(请按l)，放弃(请按a或其它键)( y/l/a : ?)？ : \n");
// printf("是否打算继续输入？是/否(y/n)？: ");
fflush(stdin);
flag = getchar();
if(flag == 'y')
{
printf("装载文件到当前文件尾部请稍侯......\n");
}
else if(flag == 'l')
{
freelikst(head);
head = NULL;
printf("已清空当前内存文件重新装载请稍侯......\n");
}
else
{
printf("你已放弃装载！\n");
fclose(fp);
return(head);
}
}
else
{
reinput1:
fflush(stdin);
printf("请输入你要装载的文件名（8字节以内）： ");
scanf("%s",filename);
if((fp = fopen(filename,"rb")) == NULL)
{
printf("无法打开该文件，文件不存在或文件错误，重新输入（请按y），放弃装载（请按n或其它键）！y/n? : \n");
fflush(stdin);
flag = getchar();
if(flag == 'y')
{
goto reinput1;
}
else
{
printf("无法打开该文件，你已放弃装载！\n");
return(head);
}
}
}
head = readcheck(head,fp);
fclose(fp);
return(head);
}
bool freelikst(struct student *head)
{
// bool saveflag = false;
struct student *p;
struct student *pnext;
p = head;
pnext = NULL;
if(head->next == NULL)
free(p);
else
{
pnext = head->next;
while(pnext != NULL)
{
free(p);
p = pnext;
pnext = pnext->next;
}
}
printf("旧链表释放成功！\n");
return(true);
}

struct student * readcheck(struct student *head,FILE *fp)
{
struct student *p;
struct student *pn;
struct student *loadp;
struct student *loadhead;
struct student *checknode;
struct student *temp;
p = NULL;
pn = NULL;
loadhead = NULL;
checknode = NULL;
loadp = NULL;
temp = NULL;
int sele = 2;
int count = 0;
while(true)
{
restart:
p = (struct student *)malloc(sizeof(struct student));
if(p == NULL)
{
printf("读取文件内存申请失败，装载失败，程序退出！\n");
exit(1);
}
if(fread(p,sizeof(struct student),1,fp) != 1)
{
free(p);
if(feof(fp))
{ if(count)
printf("文件读取结束，学生记录为空！\n");
else
printf("文件读取结束，共装载%d个学生记录！\n",count);
goto end;
}
else
{
if(count)
printf("文件损坏或文件格式不是程序支持的本文件格式！\n");
else
printf("文件后部损坏，已装载%d个学生记录！\n",count);
goto end;
}
}
else
{
if((p->stu_no != NULL)&&(scorcecheck(p->sco.chin))&&
(scorcecheck(p->sco.math))&&(scorcecheck(p->sco.engl))&&
(scorcecheck(p->aver))&&((((p->aver) - (avera((float)(p->sco.chin)
,(float)(p->sco.math),(float)(p->sco.engl))) >= -0.0001))||(((p->aver) - (avera((float)(p->sco.chin)
,(float)(p->sco.math),(float)(p->sco.engl))) <= 0.0001))))
{
count = ++count;
if(head)
{
checknode = check(p->stu_no,head);
if(checknode != NULL)
{
printf("磁盘中读取到的学生记录与内存中的学生记录学号重复：\n");
printf("内存中的学生记录为：\n");
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
printf("%d\t%s\t%f\t%f\t%f\t%f\n",checknode->stu_no,checknode->stu_name,
checknode->sco.chin,checknode->sco.math,checknode->sco.engl,
checknode->aver);
printf("磁盘中读取到的学生记录为：\n");
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
printf("%d\t%s\t%f\t%f\t%f\t%f\n",p->stu_no,p->stu_name,
p->sco.chin,p->sco.math,p->sco.engl,p->aver);
printf("请选择删除内存中的学生记录或丢弃磁盘中学生记录：[1，2]\n");
printf("删除内存中的该学生记录：请选：1\n");
printf("放弃磁盘中学生记录：请选：2\n");
do
{ printf("你的选择是：");
fflush(stdin);
scanf("%d",&sele);
if(!((sele == 1)||(sele == 2)))
printf("选择有误，请重新输入\n");
}
while(!((sele == 1)||(sele == 2)));
switch(sele)
{
case 1:
head = nodedel(checknode,head);
printf("内存中的该学生记录已被删除！\n");
break;
case 2:
count = --count;
printf("从磁盘中读取到的该学生记录信息已被丢弃！\n");
if(p->next == NULL)
{
if(count ==0)
{
printf("装载完成，没有学生记录被装载到内存！\n");
}
else
{
printf("装载完成，共装载%d个学生记录！\n",count);
}

free(p);
goto end;
}
else
{
free(p);
goto restart;
}

}
}
}

if(count ==1)
{
dkonere:
loadhead = p;
loadp = p;
temp = p;
if(p->next == NULL)
{
loadhead->next = NULL;
printf("装载完成，共装载%d个学生记录！\n",count);
goto end;
}
else
{
loadp->next = NULL;
goto restart;
}

}
else
{
checknode = check(p->stu_no,loadhead);
if(checknode != NULL)
{
printf("磁盘中现读取到的学生记录与磁盘中已读取到的学生记录学号重复：\n");
printf("磁盘中已读取到的学生记录为：\n");
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
printf("%d\t%s\t%f\t%f\t%f\t%f\n",checknode->stu_no,checknode->stu_name,
checknode->sco.chin,checknode->sco.math,checknode->sco.engl,
checknode->aver);
printf("磁盘中现读取到的学生记录为：\n");
printf("学号\t姓名\t语文\t\t数学\t\t英语\t\t平均成绩\n");
printf("%d\t%s\t%f\t%f\t%f\t%f\n",p->stu_no,p->stu_name,
p->sco.chin,p->sco.math,p->sco.engl,p->aver);
printf("请选择丢弃磁盘中已读取到的学生记录或丢弃磁盘中现读取到的学生记录：[1，2]\n");
printf("丢弃磁盘中已读取到的学生记录：请选：1\n");
printf("丢弃磁盘中现读取到的学生记录：请选：2\n");
do
{ printf("你的选择是：");
fflush(stdin);
scanf("%d",&sele);
if(!((sele == 1)||(sele == 2)))
printf("选择有误，请重新输入\n");
}
while(!((sele == 1)||(sele == 2)));
switch(sele)
{
case 1:
loadhead = nodedel(checknode,loadhead);
count = --count;
printf("磁盘中已读取到的学生记录已被丢弃！\n");
if(count = 1)
goto dkonere;
break;
case 2:
count = --count;
printf("从磁盘中现读取到的该学生记录信息已被丢弃！\n");
if(p->next == NULL)
{

printf("装载完成，共装载%d个学生记录！\n",count);
free(p);
goto end;
}
else
{
free(p);
goto

[buerke]

高手就是高手
这么不一样

[kgduwu]

restart;
}

}
}
temp = loadp;
loadp->next = p;
loadp = p;
if(p->next == NULL)
{
printf("装载完成，共装载%d个学生记录！\n",count);
goto end;
}
else
{
loadp->next = NULL;
goto restart;
}

}
}
else
{
free(p);
if(count == 0)
{
printf("文件数据错误,装载失败！\n");
goto end;
}
else
{
printf("已装载%d个学生记录，读取该文件第%d个学生记录时数据错误,程序返回！\n",count,(count + 1));
goto end;
}
}
}
}
end:
if(head == NULL)
return(loadhead);
else
{
pn = head;
while(pn->next)
{
pn = pn->next;
}
pn->next = loadhead;
return(head);
}
}

float scorceinput(void)
{ float a = 0;
bool scorceflag = false;
while(!scorceflag)
{
scanf("%f",&a);
scorceflag = scorcecheck(a);
if(scorceflag)
return(a);
else
printf("输入有误（分值必须介于0 ~100之间），请重新输入: ");
}
}

bool scorcecheck(float a)
{
if((a >= 0)&&(a <= 100))
return(true);
else
return(false);
}

struct student * nodedel(struct student *delnode,struct student *head)
{
struct student *p;
struct student *pnext;
p = head;
pnext = head->next;
if(head == delnode)
head = head->next;
else
{while(pnext != delnode)
{
p = pnext;
pnext = pnext->next;
}
p->next = delnode->next;
}
free(delnode);
return head;
}
这是恰好以前写好的,有源码,编译通过可运行的,太长,复制时注意每一楼的连接处,代码有错位,你给出你的邮箱也可发给你,供参考

[我看你有戏]

看看这个源代码

http://60.191.231.66:8105/ShowFileData.aspx?ID=323

http://60.191.231.66:8105/ShowFileData.aspx?ID=323

[congzai1]

又是课后作业拿来问。。。。。。中国以后的程序员咋办呢。。。。。。。

[tengye19840704]

五楼的 char zifu[][5]={"学号","12345","?文","数学 ","英?"};
这里每一项为什么只能输入五个字符啊..多输就错了.例如上面那样.

[heimazhanghui]

谢谢你们了，我正要找这个程序！