做的挺长时间的课程设计，当作参考吧
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 20
struct student
{
long num;
char name[20];
char sex[10];
int age;
char bz[40];
struct student *next;
};
int i,j,n,num2,num3,age3,k,m;
char name3[20],sex3[20],bz3[20],ch;
FILE *fp;
int login() //登陆函数
{
char key[20];
printf("\t ********************请输入系统密码********************\n");
do
{
scanf("%s",key);
if((strcmp("a",key))==0)
{
printf("\t password correct ,welcome !\n");
return 1; //当密码正确时，返回1，进入系统
}
printf("\t password incorrect,please input again!\n");
}while(key!=1);//当返回值不为1时，重新输入密码，直到输入真确为止
system("cls");
}
int menu() //菜单
{
int c;
printf("\t\t**********欢迎进入通讯客户端！************\n\n");
printf("\t\t|—————1.录入学生的基本信息—————|\n");
printf("\t\t|----------2.显示学生的基本信息----------|\n");
printf("\t\t|----------3.保存学生的基本信息----------|\n");
printf("\t\t|----------4.删除学生的基本信息----------|\n");
printf("\t\t|----------5.修改学生的基本信息----------|\n");
printf("\t\t|----------6.查询学生的基本信息----------|\n");
printf("\t\t|—————7.退出系统——————————|\n");
printf("\t\t请选择您要进行的功能(0~7) ");
scanf("%d",&c);
return c;
}
struct student *creat() //录入信息函数
{
struct student *head,*p1,*p2;
n=0;
p1=p2=(struct student *)malloc(sizeof(struct student));
head=NULL;
printf("请输入学生信息学号，姓名，性别，年龄，备注（键入学生学号为0时结束）\n");
while(1) //为1表真，p2->next不为0；
{
scanf("%d",&p1->num);
if(p1->num==0) //判断学生的学号是否为0，如果为0则停止输入数据；
{
break;
}
scanf("%s%s%d%s",p1->name,p1->sex,&p1->age,p1->bz);
n=n+1;
if(n==1)
{
head=p1;
}
else
{
p2->next=p1;
}
p2=p1;
p1=(struct student *)malloc(sizeof(struct student));
}
p2->next=NULL;
system("cls");
return(head);
}
void print(struct student *head) //输出信息函数
{
struct student *p;
printf("\t\t这里有 %d 个学生的数据信息\n",n);
p=head;
if(head!=NULL)
{
do
{
printf("\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n",p->num,p->name,p->sex,p->age,p->bz);
p=p->next;
}while(p!=NULL);
}
else
{
return 0;
}
printf("\n");
}
int save(struct student *p) //保存信息函数
{
FILE *fp;
if((fp=fopen("keshe.txt","wb"))==NULL)
{
printf("open file fail\n");
}
fp=fopen("stud","wb");
do
{
fwrite(p,sizeof(struct student),1,fp);
p=p->next;
}while(p!=NULL);
printf("\t\t\t保存成功!\n");
fclose(fp);
return 0;
}
struct student *del(struct student *head)
{
struct student *p1,*p2;
printf("\t\t请输入要删除学生的学号\n");
scanf("%d",&num2);
p1=head;
if(head->num==num2)
{
head=head->next;
free(p1);
n--;
}
else
{
p2=head;
while(p2->num!=num2&&p2->next!=NULL)
{
p1=p2;
p2=p2->next;
}
if(p2->num==num2)
{
p1->next=p2->next;
n--;
}
printf("delete:%ld\n",num2);
}
return (head);
}
int mod(struct student *head); //修改信息函数
struct student *modify(struct student *head)
{
if(login()==0)
{
return 0;
}
else
{
struct student *p1;
j=0;
p1=(struct student *)malloc(sizeof(struct student));
printf("\t\t\t请输入你要更改的学号\n");
scanf("%d",&num2);
printf("\t\t\t学号\n");
scanf("%d",&num3);
printf("\t\t\t姓名\n");
scanf("%s",name3);
printf("\t\t\t性别\n");
scanf("%s",sex3);
printf("\t\t\t年龄\n");
scanf("%d",&age3);
printf("\t\t\t备注\n");
scanf("%s",bz3);
p1=head;
if(head->num==num2)
{
head->num=num3;
strcpy(head->name,name3);
strcpy(head->sex,sex3);
head->age=age3;
strcpy(head->bz,bz3);
j=1;
}
else
{
p1=head->next;
if(p1!=NULL)
{
while(p1->num!=num2)
{
p1=p1->next;
}
p1->num=num2;
strcpy(p1->name,name3);
strcpy(p1->sex,sex3);
p1->age=age3;
strcpy(p1->bz,bz3);
j=1;
}
}
if(j==0)
{
printf("\t\t\t更改失败\n");
}
else
{
printf("\t\t\t更改成功\n");
}
}
system("cls");
mod(head);
}
int mod(struct student *head)
{
printf("\t\t\t请选择\n");
printf("\t\t\t1:按学号修改学生信息\n");
printf("\t\t\t2:输出修改后的学生信息\n");
printf("\t\t\t3:返回主菜单\n");
scanf("%d",&m);
switch(m)
{
case 1:head=modify(head);break;
case 2:print(head);break;
case 3:menu();break;
default:printf("\t\t\tinput error!\n");
mod(head);
}
}
int find(struct student *head);
int find1(struct student *head) //以学号方式查找
{
struct student *p1;
p1=(struct student *)malloc(sizeof(struct student));
printf("\t\t\t请输入你要查询的学生学号\n");
scanf("%d",&num2);
p1=head;
while(p1!=NULL)
{
if(p1->num==num2)
{
k=1;
printf("\t\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n\n",p1->num,p1->name,p1->sex,p1->age,p1->bz);
break;
}
p1=p1->next;
}
if(k==0)
{
printf("\t\t\t没有查询到您要找的学生信息\n\n");
}
else
{
printf("\t\t\t这就是您要找的学生信息\n\n");
}
find(head);
}
int find2(struct student *head) //以姓名方式查找
{
struct student *p1;
p1=(struct student *)malloc(sizeof(struct student));
printf("\t\t\t请输入您要查询的学生姓名\n");
scanf("%s",name3);
p1=head;
while(p1!=NULL)
{
if((strcmp(p1->name,name3))==0)
{
k=1;
printf("\t\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n\n",p1->num,p1->name,p1->sex,p1->age,p1->bz);
break;
}
p1=p1->next;
}
if(k==0)
{
printf("\t\t\t没有找到该学生信息\n\n");
}
else
{
printf("\t\t\t这就是您要查询的学生信息\n\n");
}
find(head);
}
int find3(struct student *head) //以性别方式查找
{
struct student *p1;
p1=(struct student *)malloc(sizeof(struct student));
printf("\t\t\t请输入你要查询的学生的性别\n");
scanf("%s",sex3);
p1=head;
while(p1!=NULL)
{
if((strcmp(p1->sex,sex3))==0)
{
k=1;
printf("\t\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n\n",p1->num,p1->name,p1->sex,p1->age,p1->bz);
break;
}
p1=p1->next;
}
if(k==0)
{
printf("\t\t\t没有找到该学生信息\n\n");
}
else
{
printf("\t\t\t这就是您要查询的学生的信息\n\n");
}
find(head);
}
int find4(struct student *head) //以年龄方式查找
{
struct student *p1;
p1=(struct student *)malloc(sizeof(struct student));
printf("\t\t\t请输入您要查询的学生的年龄\n");
scanf("%d",&age3);
p1=head;
while(p1!=NULL)
{
if(p1->age==age3)
{
k=1;
printf("\t\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n\n",p1->num,p1->name,p1->sex,p1->age,p1->bz);
break;
}
p1=p1->next;
}
if(k==0)
{
printf("\t\t\t没有找到该学生的信息\n\n");
}
else
{
printf("\t\t\t这就是您要找的学生的信息\n\n");
}
find(head);
}
int find(struct student *head)
{
printf("\t\t\t请选择您要查询学生信息的方式\n");
printf("\t\t\t1:按学生学号查询\n");
printf("\t\t\t2:按学生姓名查询\n");
printf("\t\t\t3:按学生性别查询\n");
printf("\t\t\t4:按学生年龄查询\n");
printf("\t\t\t5:返回主菜单\n");
scanf("%d",&m);
switch(m)
{
case 1:find1(head);break;
case 2:find2(head);break;
case 3:find3(head);break;
case 4:find4(head);break;
case 5:system("cls");menu();break;
default:printf("\t\t\tinput error,please input again\n");
}
}
int main() //主函数
{
struct student *phead;
if(login()==0)
{
return 0;
}
printf("\n");
while(1)
{
switch(menu())
{
case 1:system("cls");phead=creat();break;
case 2:system("cls");print(phead);break;
case 3:system("cls");save(phead);break;
case 4:system("cls");phead=del(phead);break;
case 5:system("cls");mod(phead);break;
case 6:system("cls");find(phead);break;
case 7:system("cls");printf("\t\t\t欢迎使用，再见！\n");return 0;
default:printf("\t\t\t输入有错，请重新输入\n");
}
}
}