#include <stdio.h>
struct student
{int num;char name[15];float score[3];double avr;
};
struct student stu[50];
struct student input()
{struct student studn;int i,sum=0;printf ("请输入学号:");scanf ("%d",&studn.num);printf ("请输入姓名:");scanf("%s",&studn.name);for(i=0;i<3;i++){printf ("第%d 个成绩:",i+1);scanf ("%f",&studn.score[i]);sum+=studn.score[i];}studn.avr=sum/3.0;return studn;
}
void display(struct student stud[],int count)
{printf ("\n学号\t姓名\t平均成绩\n");for (int i=0;i<count;i++){printf ("%d",stud[i].num);printf ("\t%s",stud[i].name);printf ("\t%7.2f",stud[i].avr);printf ("\n");}
}
void sort (struct student stud[],int count)
{struct student t;for (int i=0;i<count;i++){for (int j=0;j<count-i-1;j++){if ((stud[j].avr)<(stud[j+1].avr)){t=stud[j];stud[j]=stud[j+1];stud[j+1]=t;}}}
}void insert (struct student stud[],int count)
{int i,j;struct student temp;printf ("请输入要插入学员的信息\n");temp = input();for(i=0;i<count;i++){if((stud[i].avr)<(temp.avr))break;}for (j=count;j>=i;j--){stud[j+1]=stud[j];}stud[i]=temp;
}
void display2(struct student stud[],int count)
{printf ("\n学号\t姓名\t平均成绩\n");for (int i=0;i<(count+1);i++){printf ("%d",stud[i].num);printf ("\t%s",stud[i].name);printf ("\t%7.2f",stud[i].avr);printf ("\n");}
}
void dele (struct student stud[],int count )
{int i,j,temp;//struct student temp;printf ("请输入要删除的学员的学号:\n");scanf ("%d",&temp);// temp=input();for (i=0;i<count;i++){if (stud[i].num==temp){for (j=i;j<count;j++){stud[j]=stud[j+1];}}}
}void main()
{int count=0;char ch='Y';while((ch=='y')||(ch=='Y')){stu[count]=input();count++;printf ("是否要继续(y/n):\n");fflush(stdin);scanf ("%c",&ch);}printf ("\n排序前的学员成绩序列如下:");display(stu,count);sort (stu,count);printf ("排序后的学员成绩序列如下:");display (stu,count);insert(stu,count);printf ("插入后的学员成绩序列如下:");display2 (stu,count);dele(stu,count+1);display (stu,count);
}