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//*！！！！使用说明！！！！*//
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//如果文件功能无法使用，建议在C盘建立一个"dat.txt"文件//
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#include<stdio.h>
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#include<stdlib.h>
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#include<string.h>
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#define Length sizeof(struct student) //用来开辟空间
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int n=0;
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struct student
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{
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char name[20]; //名字
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char num[20]; //学号
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char Class[20]; //班级
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char sex[20]; //性别
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int age; //年龄
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char ps[100]; //备注(postscript)
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struct student *next;
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}*head,*p,*p1,*p2; //head表示开头 p表示不同位置的数据
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void add() //添加
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{
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p1=(struct student *)malloc(Length); //开辟存储空间
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if(n==0) //判断链表开头
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head=p1; //n=0代表输入的是第一个数据 //p2的结尾所指向的地址是p1
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else p2->next=p1; //n!=0 就它们连接起来
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system("cls");
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printf("请输入学生基本信息：\n姓名：");
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scanf("%s",&p1->name);
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printf("学号：");
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scanf("%s",&p1->num);
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printf("年龄：");
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scanf("%d",&p1->age);
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printf("班级：");
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scanf("%s",&p1->Class);
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printf("性别：");
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scanf("%s",&p1->sex);
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printf("备注：");
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scanf("%s",&p1->ps);
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p2=p1; //p2指向p1所在的地址
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p2->next=NULL; //链表结束标志
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n+=1; //n判断是不是第一个数据
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system("pause");
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system("cls");
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}
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void print()
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{
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if(n!=0)
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{
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p=head; //p先指向开头
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system("cls");
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printf("姓名\t学号\t\t班级\t年龄\t性别\t\t备注\n");
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do
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{
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printf("%-8s%-16s%-8s%-8d%-16s%-8s\n",p->name,p->num,p->Class,p->age,p->sex,p->ps);
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p=p->next; //p打印结束 把p指向next以判断下一个区域有没有内容
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}while(p!=NULL); //只要p指向的内存区域有数据 就打印内容
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}
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else
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printf("您还没有添加数据!\n");
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system("pause");
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system("cls");
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}
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void find() //查找
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{
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void find1();
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void find2();
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if(n!=0)
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{
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int a;
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system("cls");
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printf("1.按姓名查找\n2.按学号查询\n3.按性别查找\n4.按年龄查找\n");
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scanf("%d",&a);
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switch(a)
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{
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case 1:
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find1();
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break;
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case 2:
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find2();
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break;
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case 3:
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find3();
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break;
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case 4:
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find4();
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break;
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}
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}
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else
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{printf("对不起，您还没有添加数据!\n");system("pause");}
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}
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void Delete()
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{
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if(n!=0)
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{
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struct student *f,*l; //定义新的指针 f使用来指向要删除的数据用来释放内存!
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char a[20];
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printf("请输入要删除的姓名：");
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scanf("%s",&a);
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p=head;
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if(strcmp(head->name,a)==0)
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{f=head;head=head->next;free(f);}
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else
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{
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do
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{
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if(strcmp(p->name,a)==0)
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{f=p;l->next=p->next;free(f);break;}
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l=p; //不满足if表示这不是要删除的那一个节点，l暂时指向p 之后p再指向下一个节点，如果这个是要删除的节点那么l指向这个节点的next的地址
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p=p->next;
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}while(p!=NULL);
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}
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}
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else
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printf("您还没有添加数据!\n");
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printf("数据已经被删除\n");
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system("pause"); //等待命令
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system("cls");
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}
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void amend()
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{
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if(n!=0)
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{
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int c;
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char a[20];
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printf("请输入要修改的姓名：");
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scanf("%s",&a);
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p=head;
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do
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{
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if(strcmp(a,p->name)==0)
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{
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printf("\n被修改人信息如下：\n姓名\t学号\t\t班级\t年龄\t性别\t\t备注\n");
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printf("%-8s%-16s%-8s%-8d%-16s%-8s\n",p->name,p->num,p->Class,p->age,p->sex,p->ps);
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break;
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}
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p=p->next; ////指针指向下一个节点
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}while(p!=NULL);
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printf("\n\n1.修改姓名\n2.修改学号\n3.修改班级\n4.修改年龄\n5.修改性别\n6.修改备注\n7.退出修改\n\n");
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scanf("%d",&c);
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switch(c)
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{
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case 1:
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printf("姓名修改为：");
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scanf("%s",&p->name);break;
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case 2:
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printf("学号修改为：");
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scanf("%s",&p->num);break;
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case 3:
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printf("班级修改为：");
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scanf("%s",&p->Class);break;
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case 4:
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printf("年龄修改为：");
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scanf("%d",&p->age);break;
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case 5:
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printf("专业修改为：");
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scanf("%s",&p->sex);break;
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case 6:
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printf("备注修改为：");
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scanf("%s",&p->ps);break;
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case 7:
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break;
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}
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printf("\n\n操作成功!\n\n");
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}
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else
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printf("******您还没有添加数据哟!\n");
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system("pause");
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system("cls");
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}
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void save()
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{
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FILE *fp;
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struct student *p;
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if((fp=fopen("C:\\data.txt","wb"))==NULL)
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printf("Can not open the file!");
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p=head;
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while(p!=NULL)
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{
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if(fwrite(p,Length,1,fp)!=1)
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{
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printf("写入数据出错\n");
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fclose(fp);
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break;
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}
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p=p->next;
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}
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fclose(fp);
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printf("存储完成\n");
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system("pause");
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system("cls");
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}
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void read()
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{
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FILE *fp;
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if((fp=fopen("C:\\data.txt","rb+"))==NULL)
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{printf("Can not open file!");exit(0);}
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do
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{
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p1=malloc(Length);
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if(n==0) //判断链表开头
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head=p1; //n=0代表输入的是第一个数据 //p2的结尾所指向的地址是p1
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else
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p2->next=p1;;
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fread(p1,Length,1,fp);
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p2=p1;
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n+=1;
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}while(p2->next!=NULL);
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fclose(fp);
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printf("读取完成!\n\n");
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system("pause");
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system("cls");
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}
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//主函数**********************************************
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void main()
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{
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int a=1;
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while(a!=0)
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{
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system("cls");
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printf("〓〓〓〓〓〓〓〓〓 ☆ 学 生 成 绩 管 理 系 统 ☆ 〓〓〓〓〓〓〓〓〓〓\n");
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printf("〓〓〓〓〓〓〓〓〓★ ☆ 1.增加学生信息 ☆ ★〓〓〓〓〓〓〓〓〓\n");
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printf("〓〓〓〓〓〓〓〓〓★ ☆ 2.显示全部信息 ☆ ★〓〓〓〓〓〓〓〓〓\n");
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printf("〓〓〓〓〓〓〓〓〓★ ☆ 3.查找学生信息 ☆ ★〓〓〓〓〓〓〓〓〓\n");
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printf("〓〓〓〓〓〓〓〓〓★ ☆ 4.删除学生信息 ☆ ★〓〓〓〓〓〓〓〓〓\n");
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printf("〓〓〓〓〓〓〓〓〓★ ☆ 5.修改学生信息 ☆ ★〓〓〓〓〓〓〓〓〓\n");
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printf("〓〓〓〓〓〓〓〓〓★ ☆ 6.保存学生信息 ☆ ★〓〓〓〓〓〓〓〓〓\n");
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printf("〓〓〓〓〓〓〓〓〓★ ☆ 7.读取学生信息 ☆ ★〓〓〓〓〓〓〓〓〓\n");
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printf("〓〓〓〓〓〓〓〓〓★ ☆ 0. 退出系统 ☆ ★〓〓〓〓〓〓〓〓〓\n");
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printf("请选择：");
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scanf("%d",&a);
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if(a>=0&&a<=9)
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{
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switch(a)
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{
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case 1:
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add();
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break;
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case 2:
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print();
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break;
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case 3:
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find();
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break;
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case 4:
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Delete();
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break;
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case 5:
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amend();
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break;
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case 6:
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save();
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break;
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case 7:
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read();
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break;
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}
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}
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else
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{
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printf(" 您输入的不符合要求，将返回主菜单!\n");
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system("pause");
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}
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}
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}
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void find1 ()
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{
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char a[20];
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printf("请输入要查找的姓名：");
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scanf("%s",&a);
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p=head;
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do
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{
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if(strcmp(a,p->name)==0)
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{
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printf("\n信息已被找到：\n姓名\t学号\t\t班级\t年龄\t性别\t\t备注\n");
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printf("%-8s%-16s%-8s%-8d%-16s%-8s\n\n",p->name,p->num,p->Class,p->age,p->sex,p->ps);
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}
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p=p->next; ////指针指向下一个节点
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}while(p!=NULL);
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system("pause");
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system("cls");
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}
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void find2 ()
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{
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char a[20];
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printf("请输入要查找的学号：");
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scanf("%s",&a);
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p=head;
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do
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{
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//指针指向开头
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if(strcmp(a,p->num)==0)
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{
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printf("\n信息已被找到：\n姓名\t学号\t\t班级\t年龄\t性别\t\t备注\n");
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printf("%-8s%-16s%-8s%-8d%-16s%-8d\n\n",p->name,p->num,p->Class,p->age,p->sex,p->ps);
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}
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p=p->next; //指针指向下一个节点
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}while(p!=NULL);
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system("pause");
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system("cls");
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}
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void find3 ()
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{
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char a[20];
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printf("请输入要查找的性别：");
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scanf("%s",&a);
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p=head;
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do
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{
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//指针指向开头
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if(strcmp(a,p->sex)==0)
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{
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printf("\n信息已被找到：\n姓名\t学号\t\t班级\t年龄\t性别\t\t备注\n");
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printf("%-8s%-16s%-8s%-8d%-16s%-8d\n\n",p->name,p->num,p->Class,p->age,p->sex,p->ps);
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}
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p=p->next; //指针指向下一个节点
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}while(p!=NULL);
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system("pause");
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system("cls");
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}
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void find4 ()
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{
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char a[20];
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printf("请输入要查找的年龄：");
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scanf("%s",&a);
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p=head;
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do
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{
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//指针指向开头
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if(strcmp(a,p->age)==0)
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{
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printf("\n信息已被找到：\n姓名\t学号\t\t班级\t年龄\t性别\t\t备注\n");
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printf("%-8s%-16s%-8s%-8d%-16s%-8d\n\n",p->name,p->num,p->Class,p->age,p->sex,p->ps);
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}
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p=p->next; //指针指向下一个节点
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}while(p!=NULL);
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system("pause");
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system("cls");
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}
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