文章目录
原题题目
代码实现
credits = score = 0
gpa = [4.0,3.7,3.3,3.0,2.7,2.3,2.0,1.5,1.3,1.0,0];level = ['A','A-','B+','B','B-','C+','C','C-','D','D-','F']
while True:
str = input()
if(str == '-1'):break
else:
temp = float(input())
score += temp*gpa[level.index(str)]
credits += temp
print("%.2f" %(score/credits))