C语言链表实现简单的学生信息管理系统
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C语言链表实现增删查改
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct student{
char num[20];
char name[20];
int Chanese;
int English;
int Math;
struct student *next;
}Lnode,* LinkList;
void Display(LinkList list){
Lnode *p = list->next;
while( p != NULL ){
printf("链表值为：\n");
printf("%-16s%-16s%-8d%-8d%-8d\n",p->num,p->name,p->Chanese,p->English,p->Math);
p = p->next;
}
}
void InitList(LinkList list){
Lnode *head=list;
head = (LinkList)malloc(sizeof(Lnode));
head->next = NULL;
}
void AddStudent(LinkList list){
Lnode *p = list,*node;
node = (LinkList)malloc(sizeof(Lnode));
while(p->next != NULL){
p = p->next;
}
p->next = node;
p = node;
printf("请输入该生的学号,姓名，语文成绩，英语成绩，数学成绩：\n");
scanf("%s",&node->num);
scanf("%s",&node->name);
scanf("%d",&node->Chanese);
scanf("%d",&node->English);
scanf("%d",&node->Math);
p->next = NULL;
}
void Search_name(LinkList list){
Lnode *p = list->next;
char a[20];
printf("请输入要查找学生的姓名：\n");
scanf("%c",&a);
while( p != NULL ){
if(strcmp(a,p->name) == 0){
printf("查找结果如下：\n学号\t姓名\t语文成绩\t英语成绩\t数学成绩\t");
printf("%-16s%-8s%-8d%-8d%-8d\n",p->num,p->name,p->Chanese,p->English,p->Math);
}
p = p->next;
}
}
void Search_num(LinkList list){
Lnode *p = list->next;
char a[20];
printf("请输入要查找学生的学号：\n");
scanf("%s",&a);//不要忘了去地址符
//Display(p);
//printf("输入的值为：%s",a);
while( p != NULL ){
if(strcmp(a,p->num) == 0){
printf("查找结果如下：\n学号\t姓名\t语文成绩\t英语成绩\t数学成绩\t\n");
printf("%-s\t%-s%\t%-d\t%-d\t%-d\t\n",p->num,p->name,p->Chanese,p->English,p->Math);
}
p = p->next;
}
}
void SearchStudent(LinkList list){
int n = 0;
printf("请选择查找方式：\n1.按姓名查找\n2.按学号查找\n");
scanf("%d",&n);
printf("输入的值为：%d\n",n);
if ( n==1 ){
Search_name(list);
}
else if( n==2 ){
Search_num(list);
}
else{
printf("输入有误！\n");
}
}
void Dele_name(LinkList list){
Lnode *pre = list,*p = pre->next,*q;
char a[20];
printf("请输入要删除学生的姓名：\n");
scanf("%s",&a);
while( p != NULL ){
if(strcmp(a,p->name) == 0){
q = p; // q = p;
p = p->next; // pre->next = p->next;
pre->next = p; // p = p->next;
free(q); //注意上面的错误
}
else{//这里要加else
pre = p;
p = p->next;
}
}
}
void Dele_num(LinkList list){
Lnode *pre = list,*p = pre->next,*q;
char a[20];
printf("请输入要删除学生的学号：\n");
scanf("%s",&a);//要用%s 和 &a
while( p != NULL ){
printf("测试\n");
if(strcmp(a,p->num) == 0){
q = p;
p = p->next;
// pre->next = p->next;
// p = pre->next;
pre->next = p;
free(q);
printf("测试2\n");
}
else{
pre = p;
p = p->next;
}
}
}
void DeleStudent(LinkList list){
printf("选择删除方式：\n1.按姓名删除\n2.按学号删除\n");
int n = 0;
scanf("%d",&n);
if ( n==1 ){
Dele_name(list);
}
else if( n==2 ){
Dele_num(list);
}
else{
printf("输入有误！\n");
}
}
void Change_name(LinkList list){
Lnode *p = list->next;
char a[20],s[20];
int n=0;
printf("请输入要修改学生的姓名：\n");
scanf("%s",&a);
while( p != NULL ){
if(strcmp(a,p->name) == 0){
printf("选择要修改的学生信息；\n");
printf("1.学号 2.姓名 3.语文成绩 4.英语成绩 5.数学成绩");
scanf("%d",&n);
switch(n){
case 1:
printf("学号修改为：\n");
scanf("%s",&p->num); break;
case 2:
printf("姓名修改为：\n");
scanf("%s",&p->name);break;
case 3:
printf("语文成绩修改为：\n");
scanf("%d",&p->Chanese);break;
case 4:
printf("英语成绩修改为：\n");
scanf("%d",&p->English);break;
case 5:
printf("数学成绩修改为：\n");
scanf("%d",&p->Math);break;
}
p = p->next;
}
else
p = p->next;
}
}
void Change_num(LinkList list){
Lnode *p = list->next;
char a[20],s[20];
int n=0;
printf("请输入要修改学生的学号：\n");
scanf("%s",&a);
while( p != NULL ){
if(strcmp(a,p->num) == 0){
printf("选择要修改的学生信息；\n");
printf("1.学号 2.姓名 3.语文成绩 4.英语成绩 5.数学成绩");
scanf("%d",&n);
switch(n){
case 1:
printf("学号修改为：\n");
scanf("%s",&p->num); break;
case 2:
printf("姓名修改为：\n");
scanf("%s",&p->name);break;
case 3:
printf("语文成绩修改为：\n");
scanf("%d",&p->Chanese);break;
case 4:
printf("英语成绩修改为：\n");
scanf("%d",&p->English);break;
case 5:
printf("数学成绩修改为：\n");
scanf("%d",&p->Math);break;
}
p = p->next;
}
else
p = p->next;
}
}
void ChangeStudent(LinkList list){
printf("选择修改方式：\n1.查姓名修改\n2.查学号修改\n");
int n = 0;
scanf("%d",&n);
if ( n==1 ){
Change_name(list);
}
else if( n==2 ){
Change_num(list);
}
else{
printf("输入有误！\n");
}
}
int Average(LinkList list){
Lnode *p = list->next;
int count = 0, aver = 0, sum = 0;
int n;
printf("选择哪一门的平均成绩：\n1.语文 2.英语 3.数学 \n");
scanf("%d",&n);
switch (n){
case 1:
#define subject p->Chanese
break;
case 2:
#define subject p->English
break;
case 3:
#define subject p->Math
break;
}
while( p != NULL ){
count++;
printf("%d次的值为%d\n",count,subject);
sum += subject;
printf("sum值为：%d\n",sum);
p = p->next;
}
return aver = sum/count;
}
int main(){
LinkList list;
int aver=0;
AddStudent(list);
// SearchStudent(list);
// AddStudent(list);
// DeleStudent(list);
// Display(list);
// ChangeStudent(list);
// Display(list);
// AddStudent(list);
AddStudent(list);
aver = Average(list);
printf("平均值为：%d\n",aver);
}
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