[编程入门]成绩评定

解题思路:

注意事项:

参考代码:

x=int(input())

if x>=0 and x<60:

    print("E")

elif x>=60 and x<70:

    print("D")

elif x>=70 and x<80:

    print("C")

elif x>=80 and x<90:

    print("B")

elif x>=90 and x<=100:

    print("A")

else:

    print("输入无效，请重新输入")