// 函数功能：计算每个学生各门课程的总分和平均分 
void AverSumofEveryStudent(STU stu[], int n, int m)
{
	int i, j;
	for (i=0; i<n; i++)
	{
	    stu[i].sum = 0;
	    for (j=0; j<m; j++)
	    {
            stu[i].sum = stu[i].sum + stu[i].score[j];
	    }
	    stu[i].aver = m>0 ? stu[i].sum / m : -1;
	    printf("student %d: sum = %.0f, aver = %.0f\n", 
i+1, stu[i].sum, stu[i].aver);
	}	
}
// 函数功能：计算每门课程的总分和平均分 
void  AverSumofEveryCourse(STU stu[], int n, int m)
{
	int i, j;
    float sum[COURSE_NUM], aver[COURSE_NUM];
    /* ---------- begain ---------- */
	for (j=0; j<m; j++)
	{
	    sum[j] = 0;
	    for (i=0; i<n; i++)
	    {
            sum[j] +=  stu[i].score[j];
	    }
        aver[j]=sum[j]/i;
        printf("student %d: sum = %.0f, aver = %.0f\n", 
j+1, sum[j], aver[j]); 
    }