学生成绩管理系统

云峰xxz · 发表于 2012-3-3 23:40:11

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/************************************创建一个有n个节点的动态链表***********************************************/
#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
#include<string.h>
#define LEN sizeof(struct student)
int n; // 定义n为全局变量
struct student *head;
struct student *creat(void);
int print(struct student *head);
struct student *del(struct student * head);
struct student *Insert(struct student * head);
int searbynum(struct student * head);
int searbyname(struct student *head);
void menu();
struct student
{
int num;
int age;
char sex[20];
char name[20];
struct student *next;
};
int main()
{
char choose_1;
int choose_2;
menu();
scanf("%c",&choose_1);
switch(choose_1)
{
case 'A': {
creat();
break;
}
case 'B': {
print(head);
break;
}
case 'C': {
del(head);
printf("The information after delete is :\n");
print(head);
break;
}
case 'D': {
Insert(head);
printf("The information after delete is :\n");
print(head);
break;
}
case 'E': {
printf("1,search by number . 2,search by name .\n");
printf("please input your choice !\n");
scanf("%d",&choose_2);
switch(choose_2)
{
case 1 :searbynum(head);break;
case 2 :searbyname(head);break;
}
break;
}
case 'F': {
exit(1);
break;
}
default :{
printf("You input a wrong choose !\n");
break;
}
}
return 0;
}
/*********************************************主菜单函数*****************************************************************/
void menu()
{
printf("\t\tWelcome to go into our system !\n");
printf("**************************************************************\n*\n*\n");
printf("* A : Input information ! B : Output information ! *\n*\n");
printf("* C : Delete information! D : Insert information ! *\n*\n");
printf("* E : Search information! F : Exit ! *\n*\n*\n");
printf("**************************************************************\n\n\n");
printf("please input the operation you choose !");
}
/******************************************创建链表*********************************************************/
struct student *creat(void)
{
int i;
struct student *p1,*p2;
printf("please input the total number of student :\n");
scanf("%d",&n);
p1=p2=(struct student *)malloc(LEN);
printf("please input the 1 student's num,age,sex and name :\n");
scanf("%d,%d,%s,%s",&p1->num,&p1->age,p1->sex,p1->name);
head=NULL;
i=1;
if(n==1)
{
head=p1;
p2=p1;
}
else
do
{
if(i==1) head=p1;
else
p2->next=p1;
p2=p1;
p1=(struct student *)malloc(LEN);
printf("please input the %d student's num,age,sex and name :\n",i+1);
scanf("%d,%d,%s,%s",&p1->num,&p1->age,p1->sex,p1->name);
i=i+1;
}while(i<n);
p2->next=NULL;
return (head);
}
/*********************************打印链表*********************************************/
int print(struct student *head)
{
struct student *p;
printf("\nThere are %d records!\n\n" ,n);
p = head;
for(;p!=NULL;p=p->next)
printf("%d,%d,%s,%s",p->num,p->age,p->sex,p->name);
return 0;
}
/***********************************************删除链表中某节点*************************************************************/
struct student *del(struct student *head)
{
struct student *p1,*p2;
int number;
p1=head;
if(head==NULL)
{
printf("this is a null linklist !");
exit(0);
}
else
{
p1=head;
printf("please input the num of the student you want to delete :\n");
scanf("%d",&number);
while(number!=p1->num&&p1!=NULL)
{
p2=p1;
p1=p1->next;
}
if(p1==NULL)
printf("There is no node you want to delete!");
else
{
if(p1==head)
head=p1->next;
else
p2->next=p1->next;
}
}
n=n-1;
return (head);
}
/**********************************************插入节点**************************************************************/
struct student *Insert(struct student * head)
{
struct student *p1,*p2,*p;
p=NULL;
printf("please input the student's num,age,sex and name you want to insert :\n");
scanf("%d,%d,%s,%s",&p->num,&p->age,p->sex,p->name);
p1=p2=head;
if(NULL==head) head=p;
else
{
while (p->num>p1->num&&p1->next!=NULL)
{
p1=p2;
p1=p1->next;
}
if (p->num<=p1->num)
{
if(head==p1)
{
head=p;
p->next=p1;
}
else
{
p2->next=p;
p->next=p1;
}
}
else
{
p1->next=p;
p->next=NULL;
}
}
n=n+1;
return (head);
}
/**************************************通过学号查找**************************************************************************/
int searbynum(struct student * head)
{
struct student *p1,*p2,*p;
p=NULL;
printf("please input the number of the student you want to search :\n");
scanf("%d",&p->num);
p1=head;
if(NULL==p1)
printf("This is a null linklist !");
else
{
while(p->num!=p1->num&&p1->next!=NULL)
{
p2=p1;
p1=p1->next;
}
if(NULL==p1->next)
{
if(p->num!=p1->num)
printf("There is no student you want to search\n\n !");
else
{
printf("Searching successful !\n");
printf("%d,%d,%s,%s\n\n\n",p1->num,p1->age,p1->sex,p1->name);
}
}
else
printf("Searching successful !\n");
printf("%d,%d,%s,%s\n\n\n",p1->num,p1->age,p1->sex,p1->name);
}
return 0;
}
/*********************************************通过姓名查找*****************************************************************/
int searbyname(struct student *head)
{
struct student *p1,*p2,*p;
p=NULL;
printf("please input the name of the student you want to search :\n");
scanf("%s",p->name);
p1=head;
if(NULL==p1)
printf("This is a null linklist !\n");
else
{
while((strcmp(p->name,p1->name)!=0)&&p1->next!=NULL)
{
p2=p1;
p1=p1->next;
}
if(NULL==p1->next)
{
if(strcmp(p->name,p1->name)!=0)
printf("There is no student you want to search !\n");
else
{
printf("Searching successful !!\n");
printf("%d,%d,%s,%s",p1->num,p1->age,p1->sex,p1->name);
}
}
else
{
printf("Searching successful !!\n");
printf("%d,%d,%s,%s",p1->num,p1->age,p1->sex,p1->name);
}
}
return 0;
}
/******************************修改学生信息（通过学号查找）*************************************************/
struct student *chabynum(struct student * head)
{
struct student *p1,*p2,*p;
p=NULL;
printf("please input the number of the student you want to change :\n");
scanf("%d",&p->num);
p1=head;
if(NULL==p1)
printf("This is a null linklist !");
else
while(p->num!=p1->num&&p1->next!=NULL)
{
p2=p1;
p1=p1->next;
}
if(NULL==p1->next)
{ if(p->num!=p1->num)
printf("There is no student you want to change !\n\n ");
else
{
printf("Searching successful !\n");
printf("please input the %d number student's age :\n",p1->num);
scanf("%d",&p->age);
p1->age=p->age;
printf("please input the %d number student's sex :\n",p1->num);
scanf("%s",p->sex);
strcpy(p1->sex,p->sex);
printf("please input the %d number sthdent's name :\n",p1->num);
scanf("%s",p->name);
strcpy(p1->name,p->name);
}
}
else
{
printf("Searching successful !\n");
printf("please input the %d number student's age :\n",p1->num);
scanf("%d",&p->age);
(p1->age)=(p->age);
printf("please input the %d number student's sex :\n",p1->num);
scanf("%s",p->sex);
strcpy(p1->sex,p->sex);
printf("please input the %d number sthdent's name :\n",p1->num);
scanf("%s",p->name);
strcpy(p1->name,p->name);
}
return 0;
}
/*************************************修改信息（通过姓名）******************************************/
struct student *chabyname(struct student *head)
{
struct student *p1,*p2,*p;
p=NULL;
printf("please input the name of the student you want to search :\n");
scanf("%s",p->name);
p1=head;
if(NULL==p1)
printf("This is a null linklist !\n");
else
{
while((strcmp(p->name,p1->name)!=0)&&p1->next!=NULL)
{
p2=p1;
p1=p1->next;
}
if(NULL==p1->next)
{
if(strcmp(p->name,p1->name)!=0)
printf("There is no student you want to change !");
else
{
printf("Searching successful !\n");
printf("please input the %s student's number :\n",p1->name);
scanf("%d",&p->num);
p1->num=p->num ;
printf("please input the %s student's age :\n",p1->name);
scanf("%d",&p->age);
p1->age=p->age;
printf("please input the %s student's sex :\n",p1->name);
scanf("%s",p->sex);
strcpy(p1->sex,p->sex);
}
}
else
{
printf("Searching successful !\n");
printf("please input the %s student's number :\n",p1->name);
scanf("%d",&p->num);
p1->num=p->num;
printf("please input the %s student's age :\n",p1->name);
scanf("%d",&p->age);
p1->age=p->age;
printf("please input the %s student's sex :\n",p1->name);
scanf("%s",p->sex);
strcpy(p1->sex,p->sex);
}
}
return(head);
}
最近自己敲了一个学生成绩管理系统的代码，可是运行的时候总是运行不了，求各位大牛指点迷津

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