自己写的小东西,虽然网上有很多了,只为练练手,我有很多不足,希望大家多多指点,赐教.
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
/********定义学生结构体********/
typedef struct Link
{
int number;
char name[10];
char sex[4];
int Chinese;
int English;
int Match;
float average;
struct Link *next;
}Student;
int amount=0;;//记录学生个数
/*****************************/
/***********初始化学生表*************/
Student *InitStudent()
{
Student *Q;
Q=(Student*)malloc(sizeof(Student));
if(Q!=NULL)
{
Q->next=NULL;
return Q;
}
else
return NULL;
}
/***********************************/
/**************创建学生数据表*********************/
int CreatStudent(Student *Q)
{
int flag,n;
Student *s;
n=0;
while(flag)
{
s=(Student*)malloc(sizeof(Student));
if(s==NULL)
{
printf("创建失败！");
return 0;
}
printf("请输入学号(输入0退回上一步):");
scanf("%d",&s->number);
if(s->number==0)
goto endp;
if(n==s->number)
{
printf("输入学号已存在!\n");
goto end;
}
while(s->number<0)
{
getchar();
printf("\n学号不能为小于零!");
printf("\n请输入学号,输入0退回上一步:");
scanf("%d",&s->number);
}
printf("请输入姓名:");
scanf("%s",s->name);
printf("请输入性别m/w:");
scanf("%s",s->sex);
printf("请输入语文成绩:");
scanf("%d",&s->Chinese);
while(s->Chinese>100||s->Chinese<0)
{
getchar();
printf("请输入语文成绩:");
scanf("%d",&s->Chinese);
}
printf("请输入数学成绩:");
scanf("%d",&s->Match);
while(s->Match>100||s->Match<0)
{
getchar();
printf("请输入数学成绩:");
scanf("%d",&s->Match);
}
printf("请输入英语成绩:");
scanf("%d",&s->English);
while(s->English>100||s->English<0)
{
getchar();
printf("请输入英语成绩:");
scanf("%d",&s->English);
}
s->average=(s->Chinese+s->English+s->Match)/3;
n=s->number;
s->next=Q->next;
Q->next=s;
amount++;
end: printf("是否继续输入数据:1/0\n");
scanf("%d",&flag);

}
endp:printf("创建完毕！\n");
printf("输入了%d个学生",amount);
return 1;
}
/******************************************/
/*********************查找学生数据，以学号为前提****************/
Student *FindStudent(Student *Q,int x)
{

Student *q;
q=Q->next;
while(q!=NULL&&q->number!=x)
q=q->next;
if(q!=NULL)
return q;
else
return NULL;
}
/******************************************************/
/**************************修改学生数据**************************/
int ModifStudent(Student *Q,int x)
{
int flag,n;
Student *q;
q=Q->next;
while(q!=NULL&&q->number!=x)
q=q->next;
if(q!=NULL)
{
while(n)
{
printf("\n修改成绩科目：1.语文 2.英语 3.数学:");
scanf("%d",&flag);
if(flag==1)
{
getchar();
printf("\n请输入语文成绩:");
scanf("%d",&q->Chinese);
while(q->Chinese>100||q->Chinese<0)
{
getchar();
printf("\n请输入语文成绩:");
scanf("%d",&q->Chinese);
}
}
else if(flag==2)
{

getchar();
printf("\n请输入数学成绩:");
scanf("%d",&q->Match);
while(q->Match>100||q->Match<0)
{
getchar();
printf("\n请重新输入数学成绩:");
scanf("%d",&q->Match);
}
}
else if(flag==3)
{
getchar();
printf("\n请输入英语成绩:");
scanf("%d",&q->English);
while(q->English>100||q->English<0)
{
printf("\n请重新英语成绩:");
scanf("%d",&q->English);
}
}
q->average=(q->Chinese+q->English+q->Match)/3;
printf("\n是否继续修改数据:1/0\n");
scanf("%d",&n);
}

return 1;
}

return 0;
}
/******************************************************/
/************************排列学生数据***********************/
Student *Sort(Student *Q,int course)
{

Student *p,*q,*t;
int number,Chinese,English,Match,score;
char name[10],sex[2];
if(Q->next==NULL)
{
printf("没有构造学生表！");
return NULL;
}
switch(course)
{
case 1:for(p=Q->next;p;p=p->next)
{
t=p;
for(q=Q->next;q;q=q->next)
{
if(t->Chinese>=q->Chinese)
{
number=t->number;
Chinese=t->Chinese;
English=t->English;
Match=t->Match;
score=t->average;
t->number=q->number;
t->Chinese=q->Chinese;
t->English=q->English;
t->Match=q->Match;
t->average=q->average;
q->number=number;
q->Chinese=Chinese;
q->English=English;
q->Match=Match;
q->average=score;
strcpy(name,t->name);
strcpy(sex,t->sex);
strcpy(t->name,q->name);
strcpy(t->sex,q->sex);
strcpy(q->name,name);
strcpy(q->sex,sex);
t=q;
}
}
}
break;
case 2:for(p=Q->next;p;p=p->next)
{
t=p;
for(q=Q->next;q;q=q->next)
{
if(t->English>=q->English)
{
number=t->number;
Chinese=t->Chinese;
English=t->English;
Match=t->Match;
score=t->average;
t->number=q->number;
t->Chinese=q->Chinese;
t->English=q->English;
t->Match=q->Match;
t->average=q->average;
q->number=number;
q->Chinese=Chinese;
q->English=English;
q->Match=Match;
q->average=score;
strcpy(name,t->name);
strcpy(sex,t->sex);
strcpy(t->name,q->name);
strcpy(t->sex,q->sex);
strcpy(q->name,name);
strcpy(q->sex,sex);
t=q;
}
}
}
break;
case 3:for(p=Q->next;p;p=p->next)
{
t=p;
for(q=Q->next;q;q=q->next)
{
if(t->Match>=q->Match)
{
number=t->number;
Chinese=t->Chinese;
English=t->English;
Match=t->Match;
score=t->average;
t->number=q->number;
t->Chinese=q->Chinese;
t->English=q->English;
t->Match=q->Match;
t->average=q->average;
q->number=number;
q->Chinese=Chinese;
q->English=English;
q->Match=Match;
q->average=score;
strcpy(name,t->name);
strcpy(sex,t->sex);
strcpy(t->name,q->name);
strcpy(t->sex,q->sex);
strcpy(q->name,name);
strcpy(q->sex,sex);
t=q;
}
}
}
break;



}
return Q;

}
int SaveStudent(Student *Q)
{
int i=0;
Student *p;
FILE *fp;
char open[20];
p=Q->next;
printf("请输入文件路径:");
scanf("%s",open);
if((fp=fopen(open,"w+"))==NULL)
{
printf("打开失败!");
return 0;
}
fprintf(fp,"|学号\t|姓名\t|性别\t|语文\t|英语\t|数学\t|均分\t|\n");

while(p!=NULL&&i<amount)
{
i++;
fwrite(p,sizeof(Student),1,fp);
p=p->next;
//fprintf(fp,"|%d\t|%s\t|%s\t|%d\t|%d\t|%d\t|%d\t|\n",p->number,p->name,p->sex,p->Chinese,p->English,p->Match,p->average);
}
fclose(fp);
return 1;
}

/******************************************************************/
/************************输出学生成绩*******************************************/
void print(Student *Q)
{
Student *p;
p=Q;
if(Q->next==NULL)
printf("没有学生资料!");
else
{
printf("结果为：\n");
while(p->next!=NULL)
{
p=p->next;

printf("|学号\t|姓名\t|性别\t|语文\t|英语\t|数学\t|均分\t|\n");
printf("|%d\t|%s\t|%s\t|%d\t|%d\t|%d\t|%0.2f\t|\n",p->number,p->name,p->sex,p->Chinese,p->English,p->Match,p->average);

}
}

}
/********************************************************************************/
/********************************************************************************/
void LoadStudent()
{
int flag=1;
char FileName[20];
Student *p;
FILE *fp;
printf("请输入调出文件的路径:");
scanf("%s",FileName[20]);
if((fp=fopen(FileName,"r+"))!=NULL)
{
fscanf(fp,"|学号\t|姓名\t|性别\t|语文\t|英语\t|数学\t|均分\t|\n");
printf("|学号\t|姓名\t|性别\t|语文\t|英语\t|数学\t|均分\t|\n");
while(flag)
{
p=(Student*)malloc(sizeof(Student));
fscanf(fp,"%d%s%s%d%d%d%d",&p->number,p->name,p->sex,&p->Chinese,&p->English,&p->Match,&p->average);
if(p->number==NULL)
flag=0;
else
{
printf("|%d\t|%s\t|%s\t|%d\t|%d\t|%d\t|%d\t|\n",p->number,p->name,p->sex,p->Chinese,p->English,p->Match,p->average);
flag=1;
}
}

}
else
printf("调出失败！");
fclose(fp);

}
/***************************************菜单界面********************************/
void Menu()
{
int flag,n,sure,course;
Student *Q,*p,*L;
n=0;
Q=InitStudent();
begin:
printf("\n\t\t\t 学生管理系统(可输入汉字)\n");
printf("|^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^|\n");
printf("|1输入学生数据\t\t\t2修改学生数据\t\t\t3查找学生成绩|\n");
printf("|4排列学生数据\t\t\t5保存学生成绩\t\t\t6调出文件资料|\n");
printf("|7显示学生资料\t\t\t0结束程序 \t\t\t |\n");
printf("|^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^|\n");
printf("\n操作方式:");
scanf("%d",&flag);
switch(flag)
{
case 0:goto end;break;
case 1:CreatStudent(Q);
print(Q);
goto begin;
case 2:while(n==0)
{
printf("请输入查找学生学号:");
scanf("%d",&n);
}
sure=ModifStudent(Q,n);
if(sure==1)
printf("修改成功\n");
else
printf("修改失败\n");
n=0;
goto begin;
case 3:while(n==0)
{
printf("请输入查找学生学号:");
scanf("%d",&n);
}
p=FindStudent(Q,n);
if(p!=NULL)
{
printf("\n查询结果为：\n");
printf("|学号\t|姓名\t|性别\t|语文\t|英语\t|数学\t|均分\t|\n");
printf("|%d\t|%s\t|%s\t|%d\t|%d\t|%d\t|%d\t|\n",p->number,p->name,p->sex,p->Chinese,p->English,p->Match,p->average);
}
else
printf("查找失败\n");
n=0;
goto begin;


case 4:printf("请输入排序规则(输入0返回上一步)\n1.语文 2.英语 3.数学:");
scanf("%d",&course);
if(course==0)
goto begin;
else
{
L=Sort(Q,course);
if(L!=NULL)
print(L);
}
goto begin;
case 5:SaveStudent(Q);
goto begin;
case 6:LoadStudent();
goto begin;
case 7:print(Q);
goto begin;
}

end:printf("\n\t\t\t\t 学生管理系统\n");
printf("|^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^|\n");
printf("|1输入学生数据\t\t\t2修改学生数据\t\t\t3查找学生成绩|\n");
printf("|0退出程序\n");
printf("|^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^|\n");
}
/************************************结束*************************************/
/*****************************************************/
void main()
{
Menu();
}

[此贴子已经被作者于2007-2-9 15:17:32编辑过]

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强 啊