程序四

#include<stdio.h>

#define N 3
#define M 3

struct student
{
long num;
char name[20];
int score[M];
int avg;
char grade;
}stud[N];

void ipt(struct student *p)
{
int i;
clrscr();
printf("Please input the information:/n/n");
for(i=0;i<N;i++,p++)
 {
 printf("The %d studnet number:/n",i+1);
 scanf("%ld",&p->num);
 getchar();
 printf("The %d studnet name:/n",i+1);
 gets(p->name);
 printf("The %d studnet score:/n",i+1);
 scanf("%d%d%d",&p->score[0],&p->score[1],&p->score[2]);
 p->avg=(p->score[0]+p->score[1]+p->score[2])/3;
 printf("/n");
 }
}

void check(struct student *head,int AVG)
{
 struct student *p=head;
 int i=0;
 for(i=0;i<N;i++)
  if(p->avg>(AVG+10)) p->grade='A';
  else if((p->avg)>AVG) p->grade='B';
  else p->grade='C';
 
}

void print(struct student *p)
{
int i;
printf("The result is:/n");
for(i=0;i<N;i++,p++)
 printf("The %d studnet number:%ld  name:%s  score:%3.1d,%3.1d,%3.1d,avg:%3.1d,Grade:%c/n",i+1,p->num,p->name,p->score[0],p->score[1],p->score[2],p->avg,p->grade);
}

void main()
{
int i,j,AVG,sum=0;
struct student temp;
clrscr();

ipt(stud);

for(i=0;i<N-1;i++)
  for(j=i+1;j<N;j++)
   if(stud[i].avg>stud[j].avg)
    {temp=stud[i];stud[i]=stud[j];stud[j]=temp;}
for(i=0;i<N;i++)
 sum+=stud[i].avg;
AVG=sum/N;
check(stud,AVG);
print(stud);
}