题解 | 牛牛的绩点
牛牛的绩点
https://www.nowcoder.com/practice/de8bc3e736164786b07a4dd64ed172f7
dic_1 = {'A':4.0, 'B':3.0, 'C':2.0, 'D':1.0, 'F':0}
sum1 = 0
sum2 = 0
while 1:
x = input()
if x.lower() == 'false':
break
y = int(input())
sum1 += dic_1[x] * y
sum2 += y
print("%.2f" % (sum1 / sum2))