C语言写的学生成绩管理系统(链表).doc

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

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！####\n");
break;
default: printf("\n Wrong Selection !（选择错误，请重选 ）\n");
back();

}
}
}

void menu()
{
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\n");
printf(" \n 6. 统计各门课程成绩在60分以下学生所占百分比 \n");
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");
}

void back()
{
int x;
printf("\n");
do{
printf("按1返回菜单界面:");
scanf("%d",&x);
}while(x!=1);

}

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->student.name,&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.num,p->student.name,p->student.sx,p->student.dx,p->student.ts,p->student.dl,p->student.cx,p->student.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->student.name,p->student.sx,p->student.dx,p->student.ts,p->student.dl,p->student.cx,p->student.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->student.name,&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;
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");
}

void good(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>=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);
}

void sort(struct studcode *head)
{
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;i<n-1;i++,p1=p1->next)
for(p2=p1->next,j=i+1;j<n;j++,p2=p2->next)
if(p1->student.zf<p2->student.zf)
{
temp=p2->student;
p2->student=p1->student;
p1->student=temp;
}
printf("\n*****排序成功*****\n");

}
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