学生信息管理系统(简单版)源代码

简单的学生管理,运用链表、指针等

#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
#include<string.h>
#define NUll 0
#define LEN sizeof(struct student)
struct student
{
int number;
char name[10];
float score;
struct student *next;
};


/*函数说明*/
struct student * creat(); /*创建链表*/
void print(struct student *head); /*输出学生信息*/
struct student *add(struct student *head); /*添加学生信息*/
struct student * sort(struct student *head); /*对学生信息进行排序*/
struct student * insert(struct student *head); /*插入学生信息*/
struct student * del_num(struct student *head); /*删除学生信息*/
void search(struct student *head); /*查找学生信息*/
struct student * change(struct student *head); /*修改学生信息*/

int n;
int main()
{
int num,x;
char a[5];
struct student *head0,*head,*head1;
head=NUll;
A :
printf(" 学生信息系统 \n");
printf("1.建立链表\n");
printf("2.添加学生\n");
printf("3.插入学生\n");
printf("4.删除学生\n");
printf("5.查找学生\n");
printf("6.修改学生\n");
printf("7.数据浏览\n");
printf("0.退出程序\n");
printf("请选择操作（输入0—7）：");
scanf("%d",&num);
switch(num)
{
case 1:
head=creat();
break;
case 2:
head=add(head);
head=sort(head);
print(head);
break;
case 3:
head1=insert(head);
head1=sort(head1);
print(head1);
break;
case 4:
head1=del_num(head);
print(head1);
break;
case 5:
search(head);
break;
case 6:
head1=change(head);
print(head1);
break;
case 7:
print(head);
break;
case 0:
return 0;
default :
printf("输入错误的数字！！请再输一次！\07\n");
}
goto A;
scanf("%d",&x);
return 0;
}


//创建链表
struct student * creat()
{
struct student *head,*p1,*p2;
n=0;
head=(struct student*)malloc(LEN);
if(head!=NULL)
{
printf("空链表已建立！\n");
}
else
{
printf("没有足够的内存空间！\07\n");
}
head->number=0;
strcpy(head->name,"");
head->score=0;
return head;


}

//输出学生信息
void print(struct student *head)
{
struct student *p;
if(head==NULL)
{
printf("未建立链表！！\n");
return;
}
p=head->next;
printf("\n所有学生信息的显示为：\n");
do
{
printf("学号：%d\t姓名：%s\t分数：%.2f\n",p->number,p->name,p->score);
p=p->next;
}while(p!=NUll);

}

//添加学生信息
struct student *add(struct student *head)
{
struct student *p1,*p2;
if(head==NULL)
{
printf("未建立链表！！\n");
retu
rn NULL;
}
p1=head;
while(1)
{
p2=(struct student *)malloc(LEN);
if(p2==NULL)
{
printf("没有足够的空间！\07\n");
return 0;
}
print

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