推荐回答(2个)
#include
#include
int n;
typedef struct student{
int num;
int mingci;
char name[20];
double a[4];
double sum;
double avreage;
struct student *next;
} STU;
STU *creat();
void add_student(STU *);
void show(STU *);
STU *delete_student(STU *);
void paiming(STU *);
void show_one(STU *s);
int panduan(double l);
int main() {
int choose;
STU *head=creat();
while(1){
printf("1 录入信息\n");
printf("2 查询学生信息\n");
printf("3 删除学生信息\n");
scanf("%d",&choose);
switch(choose){
case 1:add_student(head);break;
case 2:show(head);break;
case 3:head=delete_student(head);break;
default: break;
}
}
return 0;
}
//创建链表表头
STU *creat(){
n=0;
STU *head;
head=(STU *)malloc(sizeof(STU));
head->next=NULL;
return head;
}
//录入学生信息
void add_student(STU *s){
STU *p=s;
STU *p1;
while(p->next!=NULL){
p=p->next;
} while(1){
printf("请输入学号:学号为0表示输入结束输入!");
scanf("%d",&p->num);
if(p->num!=0){
n++;
printf("请输入姓名:");
scanf("%s",p->name);
printf("请输入成绩 格式C程序设计 高等数学 英语 线性代数:");
scanf("%lf%lf%lf%lf",&p->a[0],&p->a[1],&p->a[2],&p->a[3]);
p->sum=p->a[0]+p->a[1]+p->a[2]+p->a[3];
p->avreage=p->sum/4;
p->mingci=0;
p1=(STU *)malloc(sizeof(STU));
p->next=p1;
p1->next=NULL;
p=p1;
}else
{
printf("录入结束!\n");
paiming(s);
break;
}
}
}
//根据学号删除学生信息
STU *delete_student(STU *s){
int num;
STU *p=s,*p1;
printf("请输入要删除学生的学号:");
scanf("%d",&num);
while(p->next!=NULL){
if(p->num==num&&s==p){
n--;
return p->next;
}else if(p->num==num){
n--;
p1->next=p->next;
paiming(s);
return s;
} p1=p;
p=p->next;
}
if(n==0){printf("数据库目前为空,请录入信息!\n");}
else{
printf("没有发现你输入的学号!\n");}
return s;
}
//显示学生数据库信息
void show(STU *s){
STU *head=s;
if(n==0){
printf("数据库为空,请先录入信息!\n");
}
else{
while(s->next!=NULL){
printf("学号:%d 姓名:%s 成绩:%.2lf %.2lf %.2lf %.2lf 平均分:%.2lf 名次:%d \n",s->num,s->name,s->a[0],s->a[1],s->a[2],s->a[3],s->avreage,s->mingci);
s=s->next;
}
show_one(head);
}
}
//对学生按平均分排名
void paiming(STU *s){
double score[n];
int j,i=0;
STU *head=s;
while(s->next!=NULL){
score[i]=s->avreage;
s=s->next;
i++;
}
double temp;
for(i=0;i for(j=i;j if(score[i] temp=score[i];
score[i]=score[j];
score[j]=temp;
}
}
}
for(i=0;i if(score[i]!=0){
s=head;
while(s->next!=NULL){
if(s->mingci==0){
if(score[i]==s->avreage){
score[i]=0;
s->mingci=i+1;
break;
}
}
s=s->next;
}
}
}
}
//单科平均分统计
void show_one(STU *s){
double ar[4]={0};
int b[4][4]={{0},{0},{0},{0}};
int i;
while(s->next!=NULL){
for(i=0;i<4;i++){
b[i][panduan(s->a[i])]++;
ar[i]+=s->a[i];
}
s=s->next;
}
printf("各科平均分 %.2lf %.2lf %.2lf %.2lf\n",ar[0]/n,ar[1]/n,ar[2]/n,ar[3]/n);
printf("90-100分 %d %d %d %d\n",b[0][0],b[1][0],b[2][0],b[3][0]);
printf("80-89分 %d %d %d %d\n",b[0][1],b[1][1],b[2][1],b[3][1]);
printf("60-79分 %d %d %d %d\n",b[0][2],b[1][2],b[2][2],b[3][2]);
printf("60分以下 %d %d %d %d\n",b[0][3],b[1][3],b[2][3],b[3][3]);
}
int panduan(double l){
if(l>=90&&l<=100) return 0;
else if(l>=80&&l<=89) return 1;
else if(l>=60&&l<=79) return 2;
else return 3;
}
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