Day01-15/03.分支结构.md

修改练习2，提示错误的输入成绩
2019-10-30 09:29:50 +08:00 · 2019-10-30 09:29:50 +08:00 · 35fb665eb0
parent 00a3941355
commit 35fb665eb0
1 changed files with 8 additions and 2 deletions
--- a/Day01-15/03.分支结构.md
+++ b/Day01-15/03.分支结构.md
@ -118,7 +118,9 @@ Author: 骆昊
 """

 score = float(input('请输入成绩: '))
-if score >= 90:
+if score >100 or score < 0:
+    grade = 'F'
+elif score >= 90:
    grade = 'A'
 elif score >= 80:
    grade = 'B'
@ -128,7 +130,11 @@ elif score >= 60:
    grade = 'D'
 else:
    grade = 'E'
-print('对应的等级是:', grade)
+
+if grade == 'F':
+    print('请检查输入成绩有效性！')
+else:
+    print('对应的等级是:', grade)
 ```
 #### 练习3：输入三条边长，如果能构成三角形就计算周长和面积。