C语言写的学生成绩管理系统(链表)

#include

#include

#include

struct stud{

long num;

char name[20];

float sx;

float dx;

float ts;

float dl;

float cx;

float zf;

float pj;

};

struct studcode{

struct stud student;

struct studcode *next;

};

void menu();

void input(struct studcode **);

void output(struct studcode *);

void binsearch(struct studcode *);

void insert(struct studcode **);

void delet(struct studcode **);

void good(struct studcode *);

void fail(struct studcode *);

void sort(struct studcode *);

void back();

void main()

{

char choose;

int flag=1;

struct studcode *head;

head=NULL;

printf(" 请先录入学生成绩信息\n");

printf(" 输入学生学号高数、英语读写、英语听说、计算机导论和程序设计的成绩

\n");

input(&head);

while (flag)

{

system("cls");

menu(); printf(" 请选择 :"); getchar(); choose=getchar();

switch(choose)

{

case '1': output(head); back(); break;

case '2': binsearch(head); back(); break;

case '3': insert(&head); output(head); back(); break;

case '4': delet(&head); output(head); back(); break;

case '5': good(head); back(); break;

case '6': fail(head); back(); break;

case '7': sort(head); output(head); back(); break;

case '0': flag=0; printf("\n *** The End! ***\n"); printf("\n #### 感使用，欢

迎再次登录，拜拜！ break;

default: printf("\n Wrong Selection ! (选择错误，请

重选 ) \n"); back();

}

}

}

void menu()

{

void back()

{

int x;

printf("\n");

do{

printf(" 按 1 返回菜单界面 :"); scanf("%d",&x);

}while(x!=1);

} printf(" \n

学生成绩统计与分析系统 \n");

printf(" \n 菜 单 \n\n");

printf(" \n 1.

显示所有学生的信息 \n"); printf(" \n 2.

查找某学号的学生信息 \n"); printf(" \n 3.

插入某学生的信息 \n"); printf(" \n 4.

删除某学号学生的信息 \n"); printf(" \n 5.

统计各门课程成绩在 90 分以上学生所占百分比 printf(" \n 6.

统计各门课程成绩在 60 分以下学生所占百分比 printf(" \n 7.

按总分降序排序，依高低排出名次 \n"); printf(" \n

0. 退出 \n\n"); \n"); \n"); ####\n");

void input(struct studcode **headp) {

struct studcode *p;

while(1)

{

p=(struct studcode *)malloc(sizeof(struct studcode));

scanf("%ld",&p->student.num);

if(p->student.num==0) break;

scanf("%s%f%f%f%f%f",&p->https://www.360docs.net/doc/4410994070.html,,&p->student.sx,&p->student.dx,&p->student.ts,

&p->student.dl,&p->student.cx);

p->student.zf=p->student.sx+p->student.dx+p->student.ts+p->student.dl+p->student.cx;

p->student.pj=p->student.zf/ 5;

p->next=*headp;

*headp=p;

}

}

void output(struct studcode *head)

{

struct studcode *p;

p=head;

printf(”学号\t\t高数\t读写\t听说\t导论\t程序\t总分\t平均分\n");

while(p!=NULL){ printf("%-ld\t%-4s\t%-0.2f\t%-0.2f\t%-0.2f\t%-0.2f\t%-0.2f\t%-0.2f\t%-

0.2f\n",p->student.n

um,p->https://www.360docs.net/doc/4410994070.html,,p->student.sx,p->student.dx,p->student.ts,p->student.dl,p->student.cx,p-> s tudent.zf,p->student.pj);

p=p->next;

}

printf("\n");

}

void binsearch(struct studcode *head)

{

struct studcode *p;

int k=1;

long x;

p=head;

printf(" 请输入需要查找的学生的学号："); scanf("%ld",&x);

printf("\n");

while(p!=NULL){ if(p->student.num==x)

{

printf(" 该学生信息如下：\n");

printf("学号\t\t高数\t读写\t听说\t导论\t程序\t总分\t平均分\n");

printf("%-ld\t%-4s\t%-0.2f\t%-0.2f\t%-0.2f\t%-0.2f\t%-0.2f\t%-0.2f\t%-

0.2f\n",p->student.num,p

->https://www.360docs.net/doc/4410994070.html,,p->student.sx,p->student.dx,p->student.ts,p->student.dl,p->student.cx,p->stud e nt.zf,p->student.pj);

k=0;

break;

}

p=p->next;

}

if(k) printf(" 没有此学生的信息\n");

}

void insert(struct studcode **headp)

{

struct studcode *p;

p=(struct studcode *)malloc(sizeof (struct studcode));

printf(" 请输入你想插入的学生的信息\n");

scanf("%ld%s%f%f%f%f%f",&p->student.num,&p->https://www.360docs.net/doc/4410994070.html,,&p->student.sx,&p->stude

nt.dx,&p->student.ts,&p->student.dl,&p->student.cx);

p->student.zf=p->student.sx+p->student.dx+p->student.ts+p->student.dl+p->student.cx;

p->student.pj=p->student.zf/ 5;

p->next=*headp;

*headp=p;

printf("***** 插入成功*****\n");

}

void delet(struct studcode **headp)

{

struct studcode *p,*last; long x;

p=*headp;

printf(" 请输入你要删除的学生的学号："); scanf("%ld",&x);

while(p->student.num!=x&&p->next!=NULL){ last=p;

p=p->next;

} if(p->student.num==x)

{ if(p==*headp) *headp=p->next;

else

last->next=p->next;

free(p);

printf("\n***** 删除成功*****\n");

}

else printf("\n*** 删除失败，无该学生信息***\n");

}

struct studcode *p;

int x1,x2,x3,x4,x5,k;

float y1,y2,y3,y4,y5;

x1=x2=x3=x4=x5=k=0;

p=head;

while(p!=NULL){

k++;

if(p->student.sx>=90) x1++;

if(p->student.dx>=90) x2++;

if(p->student.ts>=90) x3++;

if(p->student.dl>=90) x4++;

if(p->student.cx>=90) x5++; p=p->next;

}

y1=(float)x1/k;

y2=(float)x2/k;

y3=(float)x3/k;

y4=(float)x4/k;

y5=(float)x5/k;

printf(" 高数\t 读写\t 听说\t 导论\t 程序\n"); printf("%-0.2f\t%-0.2f\t%-

0.2f\t%-0.2f\t%-0.2f\n",y1,y2,y3,y4,y5);

}

void fail(struct studcode *head) {

struct studcode *p; int x1,x2,x3,x4,x5,k; float y1,y2,y3,y4,y5; x1=x2=x3=x4=x5=k=0;

p=head; while(p!=NULL){ k++; if(p->student.sx<60) x1++; if(p->student.dx<60) x2++;

if(p->student.ts<60) x3++; if(p->student.dl<60) x4++; if(p->student.cx<60) x5++;

p=p->next;

}

y1=(float)x1/k;

y2=(float)x2/k;

y3=(float)x3/k;

y4=(float)x4/k;

y5=(float)x5/k;

printf(" 高数\t 读写\t 听说\t 导论\t 程序\n"); printf("%-0.2f\t%-0.2f\t%-

0.2f\t%-0.2f\t%-0.2f\n",y1,y2,y3,y4,y5);

}

{

struct stud temp;

int i,j,n;

struct studcode *p,*p1,*p2;

n=0;

p=head;

while(p!=NULL){

n++; p=p->next;

} for(p1=head,i=0;inext) for(p2=p1->next,j=i+1;jnext) if(p1->student.zfstudent.zf)

{

temp=p2->student; p2->student=p1->student; p1->student=temp;

}

printf("\n***** 排序成功*****\n");