#include

#include

#include

struct student

{

char num[12];

char name[20];

char sex[4];

int score;

struct student *next;

};

int menu_s()

{

int choice ;

printf(“\n　  　　学生信息管理系统\n”);

printf(“========================================

=\n”);

printf(“　   1.学生信息库的建立\n”);

printf(“　   2.插 入 学 生 信 息\n”);

printf(“　   3.查 询 学 生 信 息\n”);

printf(“　   4.删 除 学 生 信 息\n”);

printf(“　   5.输 出 所有学生信息\n”);

printf(“========================================

==\n”);

printf(“请选择1-5:\n”);

for(;;)

{

scanf(“%d”,&choice);

if (choice<0 || choice>5)

printf(“\n\t输入错误，重选1-5\n”);

else

break;　　/*跳出循环体*/

}

return choice;

}

void addlist(struct student**HL)

{

struct student* newp;

newp=(struct student*)malloc(sizeof(struct student));

if(newp==NULL)

{

printf(“内存空间用完,退出\n”);

exit(1);

}

printf(“请输入学生的学号,姓名,性别,分数,以空格隔开

\n”);

scanf(“%s%s%s%d”,newp->num,newp->name,newp-

>sex,&newp->score);

newp->next=NULL;

if(*HL==NULL)

*HL=newp;

else

{

struct student* p=*HL;

while(p->next!=NULL)

p=p->next;

p->next=newp;

}

printf(“插入完毕\n”);

}

void dellist(struct student** HL)

{

char num1[12];

char name1[20];

int i=0,choice;

struct student* cp=*HL;

struct student* ap=NULL;

printf(“===========================\n”);

printf(“1、按学号删除\n”);

printf(“2、按姓名删除\n”);

printf(“===========================\n”);

printf(“　 请选择：　  　   “);

fflush(stdin);

scanf(“%d”,&choice);

if (choice==1)

{

printf(“请输入要删除学生的学号：”);

scanf(“%s”,num1);

if(cp==NULL)

{

printf(“信息库为空,不能删除\n”);

return;

//exit(1);

}

while(cp!=NULL)

{

i++;

if (strcmp(num1,cp->num)==0)

break;

ap=cp;cp=cp->next;

}

if(cp==NULL)

{

printf(“无该生信息”);

return;

//exit(1);

}

if(i==1)

*HL=cp->next;

else

ap->next=cp->next;

free(cp);

printf(“已经删除成功^_^!!!\n”);

}

else if (choice==2)

{

printf(“请输入要查找学生的姓名：\n”);

scanf(“%s”,name1);

if(cp==NULL)

{

printf(“信息库为空,不能删除\n”);

return;

//exit(1);

}

while(cp!=NULL)

{

i++;

if (strcmp(name1,cp->name)==0)

break;

ap=cp;cp=cp->next;

}

if(cp==NULL)

{

printf(“无该生信息”);

return;

//exit(1);

}

if(i==1)

*HL=cp->next;

else

ap->next=cp->next;

free(cp);

printf(“已经删除成功^_^!!!!!!\n”);

}

}

void creat(struct student **HL )

{

int n=0;

int i=0;

*HL = NULL;

struct student* newp;

printf(“学生人数,请输入：\n”);

scanf(“%d”,&n);

for (i=1;i<=n;i++)

{

newp=(struct student

*)malloc(sizeof(struct student));

if(newp==NULL)

{printf(“内存空间用完,退出\n”);

exit(1);

}

printf(“请输入学生%d的学号,姓名,性别,分

数,以逗号隔开\n”,i);

scanf(“%s %s %s %d”,newp->num,newp-

>name,newp->sex,&newp->score);

newp->next=NULL;

if(*HL==NULL)

*HL=newp;

else

{

struct student* p=*HL;

while(p->next!=NULL)

p=p->next;

p->next=newp;

}

}

printf(“储存完毕\n”);

}

void findlist(struct student *HL)

{

char num1[12];

char name1[20];

int i=0,choice;

printf(“===========================\n”);

printf(“1、按学号查询\n”);

printf(“2、按姓名查询\n”);

printf(“===========================\n”);

printf(“　 请选择：　  　   “);

scanf(“%d”,&choice);

if (choice==1)

{

printf(“请输入要查找学生的学号：”);

scanf(“%s”,num1);

while(HL!=NULL)

{

if(strcmp(num1,HL->num)==0)

{

printf(“%s ,%s ,%s ,%d

\n”,HL->num,HL->name,HL->sex,HL->score);

break;

}

else HL=HL->next;

}

if(HL==NULL)

printf(“无该生信息\n”);

}

else if (choice==2)

{

printf(“请输入要查找学生的姓名：”);

scanf(“%s”,name1);

while(HL!=NULL)

{

if(strcmp(name1,HL->name)==0)

{

printf(“%s ,%s ,%s ,%d

\n”,HL->num,HL->name,HL->sex,HL->score);

break;

}

else HL=HL->next;

}

if(HL==NULL)

printf(“无该生信息”);

}

}

void printlist(struct student *HL)

{

if(HL==NULL)

printf(“无信息,请先存储\n”);

while(HL!=NULL)

{

printf(“%s ,%s ,%s ,%d “,HL->num,HL-

>name,HL->sex,HL->score);

HL=HL->next;

printf(“\n”);

}

}

void main()

{

int c;

struct student *SHL;

//　　 HL=0x00431b90;

SHL=NULL;

loop:

switch(menu_s())

{

case 1:

printf(“**************************************\n”);

printf(“　   学生信息库的建

立　  　　 \n”);

printf(“***************************************\n”);

creat(&SHL) ;

break;

case 2:

printf(“**************************************\n”);

printf(“插入学生信息\n”);

addlist(&SHL);

break;

case 3:

printf(“**************************************\n”);

printf(“查询学生信息\n”);

printf(“**************************************\n”);

findlist(SHL);

break;

case 4:

printf(“**************************************\n”);

printf(“删除学生信息\n”);

printf(“**************************************\n”);

dellist(&SHL);

break;

case 5:

printf(“**************************************\n”);

printf(“输出所有学生信息\n”);

printf(“**************************************\n”);

printlist(SHL);

break;

}

printf(“按1继续,按2退出”);

scanf(“%d”,&c);

if(c==1)

goto loop;

else

printf(“再见！\n”);

exit(1);

}