第四次作业

#include <stdio.h>
#define MAXN 10
 
struct student{
    int num;
    char name[20];
    int score;
    char grade;
};
 
int set_grade( struct student *p, int n );
 
int main()
{   struct student stu[MAXN], *ptr;
    int n, i, count;
 
    ptr = stu;
    scanf("%d\n", &n);
    for(i = 0; i < n; i++){
       scanf("%d%s%d", &stu[i].num, stu[i].name, &stu[i].score);
    }
   count = set_grade(ptr, n);
   printf("The count for failed (<60): %d\n", count);
   printf("The grades:\n");
   for(i = 0; i < n; i++)
       printf("%d %s %c\n", stu[i].num, stu[i].name, stu[i].grade);
    return 0;
}
int set_grade( struct student *p, int n ){
    int count = 0, i;
    for(i = 0;i<n;i++,p++){
        if(p->score<60){
            p->grade = ‘D‘;
            count++;
        }
        else if((p->score<70)&&(p->score>=60)){
            p->grade = ‘C‘;
        }
        else if((p->score<85)&&(p->score>=70)){
            p->grade = ‘B‘;
        }
        else{
            p->grade = ‘A‘;
        }
    }
    return count;
}

#include <stdio.h>
struct student                 
{
int num;
char name[15];
float score[3];
float sum;
};
void calc(struct student *p,int n); 
void sort(struct student *p,int n);
int main()
{
struct student stu[5];
int i,j;
float f;
for(i=0;i<5;i++)
{
    scanf("%d%s",&stu[i].num,stu[i].name);
    for(j=0;j<3;j++)
    {
        scanf("%f",&f);
        stu[i].score[j]=f;
    }
}
calc(stu,5);
sort(stu,5);
for(i=0;i<5;i++)
{
    printf("%5d%15s",stu[i].num,stu[i].name);
    printf("  %.1f  %.1f  %.1f  %.1f\n",stu[i].score[0],stu[i].score[1],stu[i].score[2], stu[i].sum);
}
return 0;
 
void calc(struct student *p,int n)
{   int i;
    for(i=0;i<n;i++,p++)
    {
        p->sum=p->score[0]+p->score[1]+p->score[2];
    }
}
void sort(struct student *p,int n)
{   struct  student t;
    int i,j;
    for(j=0;j<n-1;j++)
    for(i=0;i<n-1-j;i++)
    if((p+i)->sum<(p+i+1)->sum)
    {t=*(p+i);
    *(p+i)=*(p+i+1);
    *(p+i+1)=t;
    }
}