黃鋐粟

score=float(input("報上你的分數:"))
if(score>=90 and score<=100):
    print ("優等")
elif(score>80 and score<90):
    print ("甲等")
elif(score>70 and score<80):
    print ("乙等")
elif(score>60 and score<70):
    print ("丙等")
elif(score<60):
    print ("不及格")
else:
    print ("輸入錯誤")