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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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#include<malloc.h>
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#include<conio.h>
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#include<ctype.h>
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#define LEN sizeof(struct student)
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int flag=0;//判断
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struct student
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{
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long long int id;
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char name[20];
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int math,chinese,english,sum;
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float avg;
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struct student *next;
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};
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//函数声明
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struct student *creat(struct student *head); //数据输入
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struct student *put(struct student *head); //数据输出显示
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struct student *delet(struct student *head,long long int id); //数据删除
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struct student *query(struct student *head); //数据查询
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struct student *update(struct student *head,long long int id); //数据修改
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struct student *order(struct student *head,int sum); //成绩排序
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struct student * creat() //建立基础的学生信息库
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{
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struct student * head,*p1,*p2;
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p1=(struct student *)malloc(sizeof(struct student)); //开辟存储空间
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printf("\t输入学生的学号为0时，停止录入.\n");
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printf("请输入学生学号:");
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scanf("%lld",&p1->id);
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if(p1->id!=0)
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{
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printf("\t请输入学生姓名:");
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scanf("%s",&p1->name);
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printf("\t请输入学生高等数学成绩:");
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scanf("%d",&p1->math);
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if(p1->math>100||p1->math<0)
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{
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printf("\t满分为100，请重新输入高等数学成绩:");
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scanf("%d",&p1->math); }
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printf("\t请输入学生大学语文成绩:");
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scanf("%d",&p1->chinese);
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if(p1->chinese>100||p1->chinese<0)
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{
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printf("\t满分为100，请重新输入大学语文成绩:");
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scanf("%d",&p1->chinese); }
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printf("\t请输入学生大学英语成绩:");
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scanf("%d",&p1->english);
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if(p1->english>100||p1->english<0)
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{
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printf("\t满分为100，请重新输入大学英语成绩:");
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scanf("%d",&p1->english); }
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p1->avg=(p1->math+p1->english+p1->chinese)/3;
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p1->sum=p1->math+p1->english+p1->chinese;}
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if(flag==0) //判断链表开头
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head=p1; //flag=0代表输入的是第一个数据 //p2的结尾所指向的地址
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else p2->next=p1; //把它们连接起来
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while(p1->id!=0)
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{
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flag=flag+1;
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if(flag==1)
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{
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head=p1;
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}
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else
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{
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p2->next=p1;
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}
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p2=p1;
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p1=(struct student *)malloc(sizeof(struct student));
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printf("\t输入学生的学号为0时，停止录入.\n");
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printf("请输入学生学号:");
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scanf("%lld",&p1->id);
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if(p1->id!=0)
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{
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printf("\t请输入学生姓名:");
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scanf("%s",&p1->name);
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printf("\t请输入学生高等数学成绩:");
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scanf("%d",&p1->math);
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printf("\t请输入学生大学语文成绩:");
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scanf("%d",&p1->chinese);
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printf("\t请输入学生大学英语成绩:");
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scanf("%d",&p1->english);
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p1->avg=(p1->math+p1->english+p1->chinese)/3;
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p1->sum=p1->math+p1->english+p1->chinese;
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}}
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p2=p1;
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p1=p2->next=NULL; //链表结束标志;;
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system("pause");
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system("cls");
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return (head);
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}
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struct student *put(struct student *head)
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{
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struct student *p2;
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p2=head;
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if(flag!=0)
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do
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{
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printf("\n学号：%lld",p2->id);
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printf("\n姓名：%s ",p2->name);
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printf("高等数学：%d ",p2->math);
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printf("大学语文：%d ",p2->chinese);
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printf("大学英语：%d ",p2->english);
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printf("平均分：%.2f ",p2->avg);
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printf("总分：%d ",p2->sum);
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p2=p2->next;
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}while(p2!=NULL);
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system("pause");
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}
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struct student *query(struct student *head, long long int id) //按学号查找
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{
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struct student *p1,*p2;
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p1=head;
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if(head==NULL) //空链表时返回
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{
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printf("/n链表为空!/n");
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return(head);
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}
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else{
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while(id!=p1->id&&p1->next!=NULL)
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{
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p2=p1;
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p1=p1->next;
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}
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if(p1->id==id)//比较输入学号是否与链表中学生学号匹配
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{
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printf("你查找的学生信息为：\n");
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printf("学号：%lld ",p1->id);
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printf("姓名：%s ",p1->name);
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printf("高等数学：%d ",p1->math);
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printf("大学语文：%d ",p1->chinese);
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printf("大学英语：%d ",p1->english);
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printf("平均分：%.2f ",p1->avg);
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printf("总分：%d",p1->sum);
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}}
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return (head);
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}
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struct student *update(struct student *head,long long int id) //修改学生成绩
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{
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struct student *p4;
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if(head==NULL) //空链表返回
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{
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printf("链表为空");
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}
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p4=head;
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for(;p4!=NULL;)
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{
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if(p4->id==id)
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{
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printf("\t请输入学生姓名:");
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scanf("%s",&p4->name);
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printf("\t请输入学生高等数学成绩:");
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scanf("%d",&p4->math);
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printf("\t请输入学生大学语文成绩:");
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scanf("%d",&p4->chinese);
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printf("\t请输入学生大学英语成绩:");
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scanf("%d",&p4->english);
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p4->avg=(p4->math+p4->english+p4->chinese)/3;
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p4->sum=p4->math+p4->english+p4->chinese;
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break;
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}
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else{
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p4=p4->next;
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}}
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return head;
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}
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struct student *delet(struct student *head,long long int id) //删除学生成绩
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{
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struct student *p5,*p6;
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if(head==NULL)
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{
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printf("此链表为空");
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return (head);
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}
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p5=head;
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while(id!=p5->id&&p5->next!=NULL) //寻找p6 即寻找要删除的前一项
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{
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p6=p5;p5=p5->next;
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}
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if(p5->id==id)
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{
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if(p5==head)
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head=p5->next;
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else
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p6->next=p5->next;
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printf("你要删除的信息为：\n");
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printf("\n学号：%lld",p5->id);
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printf("\n姓名：%s ",p5->name);
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printf("高等数学：%d ",p5->math);
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printf("大学语文：%d ",p5->chinese);
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printf("大学英语：%d ",p5->english);
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printf("平均分：%.2f ",p5->avg);
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printf("总分：%d ",p5->sum);
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}
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flag=flag-1;
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return (head);
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}
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struct student *order(struct student *head,int sum) //排序
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{
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struct student *p8,*p9;
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int n=flag,i,j;
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int temp,temp1,temp2,temp3,temp4;
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char temp5[20];
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float temp6;
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p8=head;
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for(i=0,p8->next;i<(n-1);i++,p8=p8->next)
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for(j=i+1,p9=p8->next;j<n;j++,p9=p9->next)
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if(p8->sum<p9->sum)
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{
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temp=p9->sum;p9->sum=p8->sum;p8->sum=temp;
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temp1=p9->id;p9->id=p8->id;p8->id=temp1;
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temp2=p9->math;p9->math=p8->math;p8->math=temp2;
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temp3=p9->chinese;p9->chinese=p8->chinese;p8->chinese=temp3;
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temp4=p9->english;p9->english=p8->english;p8->english=temp4;
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temp6=p9->avg;p9->avg=p8->avg;p8->avg=temp6;
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strcpy(temp5,p9->name);strcpy(p9->name,p8->name);strcpy(p8->name,temp5);
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}
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struct student *q;
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q=head;
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int count=1;
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printf("排序后学生信息为：\n");
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while(q!=NULL)
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{
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printf("\n第%d名",count);
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printf("\n学号：%lld",q->id);
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printf("\n姓名：%s ",q->name);
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printf("高等数学：%d ",q->math);
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printf("大学语文：%d ",q->chinese);
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printf("大学英语：%d ",q->english);
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printf("平均分：%.2f ",q->avg);
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printf("总分：%d ",q->sum);
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count++;
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q=q->next;
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}
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}
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void goon()
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{
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printf("\n按任意键继续程序");
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getch();
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}
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void menu()
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{
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printf("\n\n\t\t = = =欢迎使用班级成绩管理系统= = =");
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printf("\n\n\t\t 1.新建学生成绩表 ");
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printf("\n\n\t\t 2.输出学生成绩表 ");
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printf("\n\n\t\t 3.按学号查找学生成绩信息 ");
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printf("\n\n\t\t 4.按总分进行排序 ");
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printf("\n\n\t\t 5.按学号修改学生成绩信息 ");
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printf("\n\n\t\t 6.按学号删除学生信息 ");
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printf("\n\n\t\t 0.退出系统 ");
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printf("\n\n\t\t ------------------------------------");
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printf("\n\n\t\t ********请您选择操作选项******** ");
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printf("\n\t\t请输入您的选择(0-6)：");
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}
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int main()
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{
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int ckey=1;
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long long int query_id,delet_id,update_id;
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int sum;
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struct student *head,*p;
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head=(struct student*)malloc(sizeof(struct student));
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head->next=NULL;
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while(ckey!=0)
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{
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system("cls"); //vc++清屏函数，包含在#include<stdlib.h>中
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menu();
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scanf("%d",&ckey);
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switch(ckey)
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{
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case 0:
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system("cls"); //清屏
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printf("\n\n");
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printf("★★★★期待您的下次使用★★★★");
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printf("\n\n");
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break;
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case 1:
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system("cls"); //清屏
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head=creat(); //创建
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break;
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case 2:
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system("cls");
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put(head); //显示信息
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break;
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case 3:
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system("cls");
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printf("请输入要查询学生的学号:");
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scanf("%lld",&query_id);
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head=query(head,query_id);
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goon();
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break;
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case 4:
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system("cls");
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order(head,sum);
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goon();
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break;
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case 5:
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system("cls");
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printf("请输入你要修改的学生的学号:");
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scanf("%lld",&update_id);
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head=update(head,update_id);
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goon();
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break;
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case 6:
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system("cls");
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printf("请输入你要删除的学生的学号:");
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scanf("%lld",&delet_id);
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head=delet(head,delet_id);
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goon();
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break;
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}
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}
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return 0;
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}
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