求大神帮忙添加一功能···感激不尽！
# include <stdio.h># include <malloc.h>
# include <stdlib.h>
# include <conio.h>
# include <string.h>
int linklen = 0; /* 全局变量，用于记录链表长度 */
int n;
typedef struct Node /* 学生结构体 */
{
int Num; /* 学号格式为：2013XXXX */
char name[10];
char sex[10];
int year;
float score[6];
struct Node *Next; /* 保存下一位学生信息 */
}Student;
/* 输入学生信息 */
Student *Input()
{
int i;
Student *stu;
Student *p;
Student *link = (Student *)malloc(sizeof(Student));
if ( !link ){ printf("Failed to init !\n"); exit(0); }
link->Next = NULL;
p = link;
printf("请输入所需存储学生信息的人数：");
scanf("%d", &n);
getchar(); //吸收回车符
system("cls");
for ( i=1; i<=n; i++ )
{
stu = (Student *)malloc(sizeof(Student));
if ( !stu ){ printf("Failed to new!\n"); exit(0); }
printf("第%d位学生信息:\n", i);
printf("学号（学号格式为：2013XXXX）：");
scanf("%d", &stu->Num);
printf("姓名：");
scanf("%s", stu->name);
printf("性别(男/女)：");
scanf("%s", stu->sex);
printf("年龄（年龄限制为：16-24）：");
scanf("%d", &stu->year);
printf("成绩==>\n");
printf("学科一(成绩分数为：0-100): ");
scanf("%f", &stu->score[0]);
printf("学科二(成绩分数为：0-100): ");
scanf("%f", &stu->score[1]);
printf("学科三(成绩分数为：0-100): ");
scanf("%f", &stu->score[2]);
printf("学科四(成绩分数为：0-100): ");
scanf("%f", &stu->score[3]);
printf("学科五(成绩分数为：0-100): ");
scanf("%f", &stu->score[4]);
printf("学科六(成绩分数为：0-100): ");
scanf("%f", &stu->score[5]);
p->Next = stu;
p = stu;
++linklen;
system("cls");
}
return link;
}
/*向文件输入信息*/
void *save_data()
{
FILE *fp;
int i;
Student *stu;
Student *p;
Student *link = (Student *)malloc(sizeof(Student));
if ( !link ){ printf("Failed to init!\n"); exit(0); }
link->Next = NULL;
p = link;
if ( !( fp = fopen("Student.txt","wb") ) )
{ return link; }
fscanf(fp,"%d", &n);
for ( i=0; i< n; i++ )
{
stu = (Student *)malloc(sizeof(Student));
if ( !stu ){ printf("Failed to new!\n"); exit(0); }
fread(stu,sizeof(Student),1,fp);
stu->Next = NULL;
p->Next = stu;
p = stu;
}
fclose(fp);
return link;
}
/* 保存当前学生信息 */
void Save(Student *link)
{
FILE *fp;
Student *stu = link->Next;
if ( !( fp = fopen("student.txt","rb+") ) )
{ printf("文件无法打开！\n"); exit(0); }
fprintf(fp,"%3d", n);
while ( stu )
{
fwrite(stu,sizeof(Student),1,fp);
stu = stu->Next;
}
fclose(fp);
}
/*读取文本信息 */
int read_data(Student *link)
{
FILE *fp;
int i;
Student *pre = NULL;
Student *stu = NULL;
link = (Student *)malloc(sizeof(Student));
if ( !link ) { printf("Failed to new!\n"); exit(0); }
pre = link;
if ( !( fp = fopen("Student.txt","rb") ) )
{ return 0; }
fscanf(fp, "%d", &n);
for ( i=0; i< n; i++ )
{
stu = (Student *)malloc(sizeof(Student));
if ( !stu ) { printf("Failed to new!\n"); exit(0); }
fread(stu, sizeof(Student), 1, fp);
pre->Next = stu;
pre = stu;
}
fclose(fp);
return 0;
}
/* 查找学生信息 */
void Rearch(Student *link)
{
int select;
int flag=0;
Student *stu= link->Next;
printf("请选择查询学生信息的方式：\n");
printf("\t\t1.按学号查找\n");
printf("\t\t2.按姓名查找\n");
printf("\t\t请选择（1 or 2）：");
scanf("%d", &select);
system("cls");
if ( select == 1 )
{
int Num;
printf("请输入学生学号：");
scanf("%d", &Num);
while ( stu )
{
if ( stu->Num == Num )
{
printf("查找成功！\n");
system("cls");
printf("学号：%d\n", stu->Num);
printf("姓名：%s\n", stu->name);
printf("性别：%s\n", stu->sex);
printf("年龄：%d\n", stu->year);
printf("成绩==>\n");
printf("学科一: %f\n",stu->score[0]);
printf("学科二: %f\n",stu->score[1]);
printf("学科三: %f\n",stu->score[2]);
printf("学科四: %f\n",stu->score[3]);
printf("学科五: %f\n",stu->score[4]);
printf("学科六: %f\n",stu->score[5]);
// stu = stu->Next;
flag+=1;
break;
}
stu = stu->Next;
}
if ( !flag )
printf("不存在该学生信息！\n");
}
else if ( select == 2 )
{
char name[10];
printf("请输入需要查询的姓名:");
scanf("%s",name);
while( stu )
{
if ( !strcmp(stu->name,name) )
{
printf("查找成功！\n");
system("cls");
printf("学号：%d\n", stu->Num);
printf("姓名：%s\n", stu->name);
printf("性别：%s\n", stu->sex);
printf("年龄：%d\n", stu->year);
printf("成绩==>\n");
printf("学科一: %f\n",stu->score[0]);
printf("学科二: %f\n",stu->score[1]);
printf("学科三: %f\n",stu->score[2]);
printf("学科四: %f\n",stu->score[3]);
printf("学科五: %f\n",stu->score[4]);
printf("学科六: %f\n",stu->score[5]);
//stu = stu->Next;
flag+=1;
break;
}
stu = stu->Next;
}
if ( !flag )
printf("没有该学生信息！\n");
}
else
{
printf("输入错误，请重新输入！\n");
getchar();
}
}
/* 修改学生信息 */
void Change(Student *link)
{
int select;
int flag=0;
Student *stu= link->Next;
printf("请选择修改学生信息的方式：\n");
printf("\t\t1.按学号查找\n");
printf("\t\t2.按姓名查找\n");
printf("\t\t请选择（1 or 2）：");
scanf("%d", &select);
system("cls");
if ( select == 1 )
{
int Num;
printf("请输入要修改的学生学号：");
scanf("%d", &Num);
while ( stu )
{
if ( stu->Num == Num )
{
printf("查找成功！\n");
getchar();
system("cls");
printf( "请输入新同学的信息！\n" );
printf("学号（学号格式为：2013XXXX）：");
scanf("%d", &stu->Num);
printf("姓名：");
scanf("%s", stu->name);
printf("性别：");
scanf("%s", stu->sex);
printf("年龄（年龄限制为：16-24）：");
scanf("%d", &stu->year);
printf("成绩==>\n");
printf("学科一(成绩分数为：0-100): ");
scanf("%f", &stu->score[0]);
printf("学科二(成绩分数为：0-100): ");
scanf("%f", &stu->score[1]);
printf("学科三(成绩分数为：0-100): ");
scanf("%f", &stu->score[2]);
printf("学科四(成绩分数为：0-100): ");
scanf("%f", &stu->score[3]);
printf("学科五(成绩分数为：0-100): ");
scanf("%f", &stu->score[4]);
printf("学科六(成绩分数为：0-100): ");
scanf("%f", &stu->score[5]);
system("cls");
stu = stu->Next;
flag += 1;
break;
}
}
if ( !flag )
printf("没有该学生信息！\n");
}
else if ( select == 2 )
{
char name[10];
printf("请输入需要修改的姓名:");
scanf("%s",name);
while( stu )
{
if ( !strcmp(stu->name,name) )
{
printf("查找成功！\n");
getchar();
system("cls");
printf("请填入新学生的信息:\n");
printf("学号：");
scanf("%d", &stu->Num);
printf("姓名：");
scanf("%s", stu->name);
printf("性别：");
scanf("%s", stu->sex);
printf("年龄：");
scanf("%d", &stu->year);
printf("成绩==>\n");
printf("学科一: ");
scanf("%f", &stu->score[0]);
printf("学科二: ");
scanf("%f", &stu->score[1]);
printf("学科三: ");
scanf("%f", &stu->score[2]);
printf("学科四: ");
scanf("%f", &stu->score[3]);
printf("学科五: ");
scanf("%f", &stu->score[4]);
printf("学科六: ");
scanf("%f", &stu->score[5]);
system("cls");
stu = stu->Next;
flag+=1;
break;
}
if ( !flag )
printf("没有该学生信息！\n");
}
}
else
{
printf("输入错误，请重新输入！\n");
getchar();
}
}
/* 插入新的学生学生信息 */
void Insert(Student *link)
{
int pos, flag;
Student *p = link; /* 首位插入 */
Student *stu = link->Next;
Student *newstu = (Student *)malloc(sizeof(Student));
if ( !newstu ){ printf("Failed to new!\n"); exit(0); }
newstu->Next = NULL;
printf("请填入新学生的信息:\n");
printf("学号（学号格式为：2013XXXX）：");
scanf("%d", &stu->Num);
printf("姓名：");
scanf("%s", stu->name);
printf("性别(男/女)：");
scanf("%s", stu->sex);
printf("年龄（年龄限制为：16-24）：");
scanf("%d", &stu->year);
printf("成绩==>\n");
printf("学科一(成绩分数为：0-100): ");
scanf("%f", &stu->score[0]);
printf("学科二(成绩分数为：0-100): ");
scanf("%f", &stu->score[1]);
printf("学科三(成绩分数为：0-100): ");
scanf("%f", &stu->score[2]);
printf("学科四(成绩分数为：0-100): ");
scanf("%f", &stu->score[3]);
printf("学科五(成绩分数为：0-100): ");
scanf("%f", &stu->score[4]);
printf("学科六(成绩分数为：0-100): ");
scanf("%f", &stu->score[5]);
system("cls");
printf("已存在%d学生的信息！\n\n\n",linklen);
printf("请选择插入位置: ");
scanf("%d", &pos);
if ( pos>linklen+1 && pos<1 )
{
printf("越界！\n");
exit(0);
}
else if ( pos == 1 )
{
newstu->Next = p->Next;
p->Next = newstu;
printf("插入完成！\n");
}
else
{
flag = 1; /* 起始位置 */
while ( stu && flag<pos-1 )
{
stu = stu->Next;
++flag;
}
if ( !stu && flag>pos-1 )
{
printf("Data exception!\n");
exit(0);
}
newstu->Next = stu->Next;
stu->Next = newstu;
++linklen; /* 链表长度增加1 */
printf("插入完成！\n");
}
}
/* 删除学生信息 */
void Delete(Student *link)
{
int tag = 0;
int flag;
int select;
int pos;
char ch; /* 用于选择 */
Student *stu = link->Next;
printf("请选择删除学生信息的方式：\n");
printf("\t\t1.按姓名查找\n");
printf("\t\t2.按学号查找\n");
printf("\t\t请选择（1 or 2）：");
scanf("%d", &select);
system("cls");
if ( select == 1 )
{
int Num;
printf("请输入学生学号：");
scanf("%d", &Num);
pos = 1; /* 用于记录所要删除学生的位置 */
while ( stu )
{
if ( stu->Num == Num )
{
printf("查找成功！\n");
system("cls");
printf("学号：%d\n", stu->Num);
printf("姓名：%s\n", stu->name);
printf("性别：%s\n", stu->sex);
printf("年龄：%d\n", stu->year);
printf("学号：%d\n", stu->Num);
printf("成绩==>\n");
printf("学科一: %f\n",stu->score[0]);
printf("学科一: %f\n",stu->score[1]);
printf("学科一: %f\n",stu->score[2]);
printf("学科一: %f\n",stu->score[3]);
printf("学科一: %f\n",stu->score[4]);
printf("学科一: %f\n",stu->score[5]);
system("cls");
printf("您是否要删除该学生信息？（Y or N）\n");
printf("您的选择是：");
getchar(); /* 吸收回车符 */
scanf("%c", &ch);
tag = 1;
break;
}
else
{
stu = stu->Next;
++pos;
}
}
if ( !tag )
{
printf("没有该学生信息！\n");
exit (0);
}
if ( 'Y' == ch )
{
if ( pos == 1 )
{
Student *Q = link->Next;
link->Next = Q->Next;
free(Q);
Q = NULL;
}
else
{
Student *q = NULL;
Student *p = link->Next;
flag = 1; /* 查找结点位置 */
while ( p && flag<pos-1 )
{
p = p->Next;
++flag;
}
if ( !p && flag>pos-1 )
{
printf("Data exception!\n");
exit(0);
}
q = p->Next;
p->Next = q->Next;
free(q);
q = NULL;
printf("删除成功！\n");
}
}
}
else if ( select == 2 )
{
char name[10];
printf("请输入学生姓名:");
scanf(" %s ",name);
pos = 1; /* 用于记录所要删除学生的位置 */
while ( stu )
{
if ( !strcmp(stu->name,name) )
{
printf("查找成功！\n");
system("cls");
printf("学号：%d\n", stu->Num);
printf("姓名：%s\n", stu->name);
printf("性别：%s\n", stu->sex);
printf("年龄：%d\n", stu->year);
printf("成绩==>\n");
printf("学科一: %f\n",stu->score[0]);
printf("学科一: %f\n",stu->score[1]);
printf("学科一: %f\n",stu->score[2]);
printf("学科一: %f\n",stu->score[3]);
printf("学科一: %f\n",stu->score[4]);
printf("学科一: %f\n",stu->score[5]);
system("cls");
printf("您是否要删除该学生信息？(Y or N)\n");
printf("您的选择是：");
getchar(); /* 吸收回车符 */
scanf("%c", &ch);
tag = 1;
break;
}
else
{
stu = stu->Next;
++pos; /* 查找需要删除学生位置 */
}
}
if ( !tag )
{
printf("没有该学生信息！\n");
exit (0);
}
if ( 'Y' == ch )
{
if ( pos == 1 )
{
Student *Q = link->Next;
link->Next = Q->Next;
free(Q);
Q = NULL;
}
else
{
Student *q = NULL;
Student *p = link->Next;
flag = 1; /* 查找结点位置 */
while ( p && flag<pos-1 )
{
p = p->Next;
++flag;
}
if ( !p && flag>pos-1 )
{
printf("Data exception!\n");
exit(0);
}
q = p->Next;
p->Next = q->Next;
free(q);
q = NULL;
printf("删除成功！\n");
}
}
}
else
{
printf("输入错误，请重新输入！\n");
getchar();
}
}
void Show(Student *link)
{
Student *stu=link->Next;
while(stu!=NULL)
{
printf("学号：%d\n", stu->Num);
printf("姓名：%s\n", stu->name);
printf("性别：%s\n", stu->sex);
printf("年龄：%d\n", stu->year);
printf("成绩==>\n");
printf("学科一: %f\n",stu->score[0]);
printf("学科一: %f\n",stu->score[1]);
printf("学科一: %f\n",stu->score[2]);
printf("学科一: %f\n",stu->score[3]);
printf("学科一: %f\n",stu->score[4]);
printf("学科一: %f\n",stu->score[5]);
stu=stu->Next;
printf("\n");
}
}
/* 主函数运行学生管理系统 */
int main()
{
Student *link = NULL;
int select;
int flag=0;
mark:
system("cls");
printf("\t\t\t----------------------------------\n");
printf("\t\t\t* 欢迎进入学生信息管理系统 *\n");
printf("\t\t\t----------------------------------\n");
printf("\n\n");
printf("\t\t****************************************************\n");
printf("\t\t* 1.输入(Input) *\n");
printf("\t\t* 2.查询(Search) *\n");
printf("\t\t* 3.修改(Change) *\n");
printf("\t\t* 4.插入(Insert) *\n");
printf("\t\t* 5.删除(Delete) *\n");
printf("\t\t* 6.显示(Show) *\n");
printf("\t\t* 7.退出(Exit) *\n");
printf("\t\t****************************************************\n");
printf("\n\t\t请输入一个数（0--7）：");
scanf("%d", &select);
system("cls");
switch ( select )
{
case 1:
link = Input();
//save_data(link);
system("pause");
goto mark;
break;
case 2:
//read_data(link);
Rearch(link);
system("pause");
goto mark;
break;
case 3:
//read_data(link);
Change(link);
system("pause");
goto mark;
break;
case 4:
//read_data(link);
Insert(link);
system("pause");
goto mark;
break;
case 5:
//read_data(link);
Delete(link);
system("pause");
goto mark;
break;
case 6:
//read_data(link);
Show(link);
system("pause");
goto mark;
break;
case 7:
//Save(link);
exit(0);
default:
printf("输入错误，请重新输入！\n");
system("pause");
goto mark;
break;
}
return 0;
}
二次执行可以从文本文件中读取第一次执行的信息···
