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]); 
    }
    /* ----------- end ----------- */
}