这个怎么应该改，实际输出为无，这样写对吗

#include
struct student{
  int id;
  char name[10];
  float score[3];
}stu[5];
int main()
{
  float sum[5]={0};
  float avg[5];
  float max;
  float sum1=0;
  int i,j,a;
  for(i=0;i<5;i++){
    scanf("%d%s",&stu[i].id,&stu[i].name);
    for(j=0;j<3;j++){
      scanf("%f",&stu[i].score[j]);
    }
  }
  for(i=0;i<5;i++){
    for(j=0;j<3;j++){
      sum[i]+=stu[i].score[j];
    }
    avg[i]=sum[i]/3;
  }
  for(i=0;i<5;i++){
    sum1+=sum[i];
  }
  max=sum[0];
  for(i=1;i<5;i++){
    if(max"NO. name score1 score2 score3 average\n");
  for(i=0;i<5;i++){
    printf("%d %s %0.2f %0.2f %0.2f %0.2f\n",stu[i].id,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],avg[i]);
  }
  printf("average=%0.2f\n",sum1/15);
  printf("The highest score is : student %d,%s\n",stu[a].id,stu[a].name);
  printf("his scores are:%6.2f,%6.2f,%6.2f,average:%0.2f.",stu[a].score[0],stu[a].score[1],stu[a].score[2],avg[a]);
  return 0;
}

scanf("%d%s", &stu[i].id, stu[i].name); stu[i].name已经是指针，不需要加&
sum和avg放到struct student里会更好一些。