06if语句

#___author:  
#date: 2021/6/9
# a = input("请输入")
# if int(a) >= 10:
#     print(a)
# else:
#     print(True)
# b = input("请输入")
# print(b if int(b)>=10 else "数字太大" )  #三元条件运算符
# #测试多分支结构
# d = int(input('请同学输入成绩'))
# l = ''
# if d<60:
#     l = '不及格'
# elif 60<=d<80:
#     l = '及格'
# elif 80<=d<90:
#     l = '良好'
# elif 90<=d<100:
#     l = '优秀'
# print("分数:{0},等级:{1}".format(d,l))
#第二种写法
# if d<60:
#     l ="不及格"
# elif d<80:
#     l = "及格"
# elif d <90:
#     l = "良好"
# else:
#     l = "优秀"
# print("分数:{0},等级:{1}".format(d,l))
#练习
# x = int(input("请输入x坐标"))
# y = int(input("请输入y坐标"))
# if x==0 and y==0:
#     print("原点")
# elif x==0:
#     print("x轴")
# elif y==0:
#     print("y轴")
# elif x>0 and y>0:
#     print("第一现象")
# elif x>0 and y<0:
#     print("第二现象")
# elif x<0 and y<0:
#     print("第三现象")
# else:
#     print("第四现象")
#嵌套if语句
# a = int(input("请输入一个分数"))
# if a >=101 or a <=0:
#     print("请输入一个0-100的分数")
# else:
#     if a>=90:
#         print("A")
#     elif a >=80:
#         print("B")
#     elif a >=60:
#         print("C")
#     else:
#         print("E")
#第二种写法
a = int(input("请输入分数"))
b = ["A","B","C","D","E"]
c = 0
if a >=101 or a <=0:
    print("请输入一个0-100的分数")
else:
    c = a//10
    if c<6:
        c = 5
    print(b[9-c])