c语言学生成绩系统源代码

#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <winsock2.h>
#define LEN sizeof(Student)
typedef struct student
{
int num;
char name[20];
if (choose==1)
{
printf("\n请输入你要查询的学生的学号，输入0退出学号查询：");
scanf("%d",&fnum);
for(;fnum;)
{
if (max_4<p->score[3]) max_4=p->score[3];
else if (min_4>p->score[3]) min_4=p->score[3];
if (max_sum<p->sum) max_sum=p->sum;
else if (min_sum>p->sum) min_sum=p->sum;
{
mid=*pm;
*pm=*p1;
*p1=mid;
px=pm->next;
pm->next=p1->next;
p1->next=px;
}
}
printf("\n排序后的成绩表为:\n");
case 8:print(head);break;
case 0:return head;
default: printf("\n\n您的输入有误!请重新输入：\n\n");break;
}
}
}
printf("\t\t#\t3.按学生语文成绩排序\t #\n");
printf("\t\t#\t4.按学生数学成绩排序\t #\n");
printf("\t\t#\t5.按学生英语成绩排序\t #\n");
printf("\t\t#\t6.按学生计算机成绩排序\t #\n");
max_3=min_3=p->score[2];max_2=min_2=p->score[3];
max_sum=min_sum=p->sum;
for(;p;p=p->next)
{
if (max_1<p->score[0]) max_1=p->score[0];
else if (min_1>p->score[0]) min_1=p->score[0];
int score[4];
int sum;
struct student *next;
}Student;
int n;
Student *cin(void);
Student *sort_1(Student *head,int);
void sort_2(Student *head);
max_sum,min_sum,aver_sum);
}
void find(Student *head)
{
Student *p;
int choose,fnum;
char tem[20];
if (n==0) {printf("\n当前系统没有任何学生数据，您就别费劲了！\n ");return;}
p2=p1;
printf("\n请输入第%d名学生的学号，没有此学生则输入0表示结束:",n+1);
scanf("%d",&flag);
}
p2->next=NULL;
printf("\n\n");
return head;
}
Student *sort_all(Student *head)
case 3:
case 4:
case 5:
case 6:head=sort_1(head,choose);break;
case 7:print(head);sort_2(head);break;
case 5:if (pm->score[2]<p2->score[2]) pm=p2;break;
case 6:if (pm->score[3]<p2->score[3]) pm=p2;break;
}
if (pm!=p1)
if (max_2<p->score[1]) max_2=p->score[1];
else if (min_2>p->score[1]) min_2=p->score[1];
if (max_3<p->score[2]) max_3=p->score[2];
else if (min_3>p->score[2]) min_3=p->score[2];
printf("请输入第%d名学生的计算机成绩:",n);
scanf("%d",&p1->score[3]);
p1->sum=p1->score[0]+p1->score[1]+p1->score[2]+p1->score[3];
p2->next=p1;
for(;flag;)
{
n++;
p1=(Student *)malloc(LEN);
p1->num=flag;
printf("请输入第%d名学生的姓名:",n);
scanf("%s",p1->name);
printf("请输入第%d名学生的语文成绩:",n);
printf("\t\t#\t7.单科高分及均分\t #\n");
printf("\t\t#\t8.显示当前学生成绩\t #\n");
printf("\t\t#\t0.返回上一级菜单\t #\n");
printf("\t\t# # # # # 由himpo友情提供# # # # #\n\n");
scanf("%d",&p1->score[0]);
printf("请输入第%d名学生的数学成绩:",n);
scanf("%d",&p1->score[1]);
printf("请输入第%d名学生的英语成绩:",n);
Hale Waihona Puke scanf("%d",&p1->score[2]);
void print(Student *head);
Student *sort_all(Student *head);
void find(Student *head);
Student *add_new(Student *head);
Student *cin()
{
int flag;
Student *head,*p1,*p2;
n=0;
head=(Student *)malloc(LEN);
p2=head;
printf("\n请输入第%d名学生的学号，学号为0表示结束输入:",n+1);
scanf("%d",&flag);
while(getchar()!='\n');
for(;;)
{
printf("\n请输入您要查询学生的方式：\n\n");
printf("1、按学号查询；2、按姓名查询；0、我不查询了。\n\n");
printf("请选择：");
scanf("%d",&choose);
while(getchar()!='\n');
printf("请输入你要执行的操作:");
scanf("%d",&choose);
while(getchar()!='\n');
switch(choose)
{
case 1:
case 2:
printf("英语最高分为%d，最低分为%d，平均分为%.2f\n",max_3,min_3,aver_3);
printf("计算机最高分为%d，最低分为%d，平均分为%.2f\n",max_4,min_4,aver_4);
printf("总分最高分为%d，最低分位%d，平均分为%.2f\n",
Student *sort_1(Student *head,int choose)
{
Student *p1,*p2=head->next,*pm,*px;
Student mid;
if (!p2) return head;
for(p1=p2;p1->next!=NULL;p1=p1->next)
case 2:if (pm->sum<p2->sum) pm=p2;break;