string[] names = new string[] { "景珍", "林慧洋", "成蓉", "洪南昌", "龙玉民", "单江开", "田武山", "王三明" };
int[] score = new int[] { 90, 65, 88, 70, 46, 81, 100, 68 };
int sum = 0;
int average = 0;
int num=0;