c语言单链表实现学生信息的增删改查源程序 -

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "student.h"
int main(int argv,char *argc[])
{
Stu *head;
int entry,Num;
entry=login();
if(entry != 0)
return -1;
head=creat();
print(head);
while(1){
printf("input 1.添加 2.删除 3.修改 4.查询 5.打印 6.退出\n");
scanf("%d",&Num);
switch(Num){
case 1:head=add(head);print(head);break;
case 2:head=delet(head);print(head);break;
case 3:head=modify(head);print(head);break;
case 4:query(head);break;
case 5:print(head);break;
case 6:return 0;
default:printf("Invalid input\n");break;
}
}
return 0;
}
/* 创建学生链表 */
Stu *creat(void)
{
int n=0;
char i[4];
Stu *p1,*p2;
Stu *head = NULL;
p1=p2=(Stu *) malloc(sizeof(Stu));
do{
printf("please input student info:\n");
printf("name:");
scanf("%s",p1->name);
getchar();
printf("sex:");
scanf("%c",&p1->sex);
printf("num:");
scanf("%d",&p1->num);
printf("score:");
scanf("%f",&p1->score);
printf("addr:");
scanf("%s",p1->addr);
if(!n){
n++;
head=p1;
}else{
p2->next=p1;
p2=p1;
}
printf("whether input next:yes/no\n");
scanf("%s",i);
if(!strncmp(i,"y",1)){
p1=(Stu *)malloc(sizeof(Stu));
}else{
p1->next = NULL;
}
}while(!strncmp(i,"y",1));
return head;
}
/* 添加学生信息 */
Stu *add(Stu *p)
{
Stu *q,*head;
head = p;
char i[4];
while(p->next != NULL){
p=p->next;
}
q=(Stu *) malloc(sizeof(Stu));
do{
printf("please add student info:\n");
printf("name:");
scanf("%s",q->name);
getchar();
printf("sex:");
scanf("%c",&q->sex);
printf("num:");
scanf("%d",&q->num);
printf("score:");
scanf("%f",&q->score);
printf("addr:");
scanf("%s",q->addr);
p->next = q;
p=q;
printf("whether add next:yes/no\n");
scanf("%s",i);
if(!strncmp(i,"y",1)){
q=(Stu *) malloc(sizeof(Stu));
}else{
q->next= NULL;
}
}while(!strncmp(i,"y",1));
return head;
}
/* 删除学生信息 */
Stu *delet(Stu *p)
{
Stu *q,*head;
int Num;
char i[4];
head = q= p;
if(!p)
return head;
do{
printf("please input delete student num:");
scanf("%d",&Num);
while(p->num !=Num){
if(p->next!=NULL){
if(q!=p){
q->next=p;
q=p;
}
p=p->next;
}else{
printf("No find the student,sorry!\n");
return head;
}
}
if(p==head){
head=p->next;
}else if(p->next ==NULL){
q->next=NULL;
}else{
q->next=p->next;
}
free(p);
printf("whether delete again:yes/no?\n");
scanf("%s",i);
}while(!strncmp(i,"y",1));
return head;
}
/* 修改学生信息 */
Stu *modify(Stu *p)
{
Stu *head;
char i[4];
int Num,y;
head=p;
printf("please modify student num:");
scanf("%d",&Num);
do{
while(p->num!= Num){
if(p->next!=NULL){
p=p->next;
}else{
printf("No find the student,sorry!\n");
return head;
}
}
printf("Do you want to modify 1.name 2.num 3.sex 4.score 5.addr?");
scanf("%d",&y);
switch(y){
case 1:printf("name:"); scanf("%s",p->name);break;
case 2:printf("num:"); scanf("%d",&p->num);break;
case 3:printf("sex:"); scanf("%c",&p->sex);break;
case 4:printf("score:"); scanf("%f",&p->score);break;
case 5:printf("addr:"); scanf("%s",p->addr);break;
default:printf("input error!\n");break;
}
printf("whether modify again:yes/no?\n");
scanf("%s",i);
}while(!strncmp(i,"y",1));
return head;
}
/* 查询学生信息 */
void query(Stu *p)
{
int Num;
printf("Please input student num:");
scanf("%d",&Num);
while(p->num != Num){
if(p->next == NULL){
printf("No find the student ,sorry!\n");
exit(-1);
}
p= p->next;
}
printf("name=%s ,sex=%c ,score=%4.2f ,addr=%s\n",p->name,p->sex,p->score,p->addr);
}
/* 账号登录 */
int login(void)
{
int i=0;
char wel[]="Welcome to entery the student system!";
int len=sizeof(wel);
char account_new[16],account[]="class_student";
char passwd_new[16],passwd[]="123456";
printf("defaule:: 账号:class_student 密码:123456\n");
printf("if error 3 times exit\n");
for(i=0;i<3;i++){
printf("please input your 账号:");
scanf("%s",account_new);
printf("please input your 密码:");
scanf("%s",passwd_new);
if((!strncmp(account,account_new,strlen(account))) &&
(!strncmp(passwd,passwd_new,strlen(passwd)))) {
printf("succeeful!\n");
break;
}else{
if(i==2)
return -1;
printf("error!\n");
}
}
printf("%s",wel);
printf("\n");
return 0;
}
/* 信息打印 */
void print(Stu *p)
{
if(!p)
return;
do{
printf("name:%s ,sex:%c ,num:%d , score:%4.2f ,addr:%s \n",p->name,p->sex,p->num,p->score,p->addr);
p=p->next;
}while(p != NULL);
}

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