grades generator大于或等于90为“A”； 大于或等于78为“B”；大于或等于60为“C”， 六十分以下为不及格，是“D”。-Descr iption: grades generator. Is greater than or equal to 90 " A" 78 is greater than or equal to " B" greater than or equal to 60 as " C" , six ou

D算法 能仿真出图 具体分类弄不明白 是老师给的代码-D simulation algorithm can figure out the specific classification could not understand the teacher to code