在python中使用while循环中的if语句？
在python中使用while循环中的if语句？
提问于 2018-04-10 03:51:00
我有一个自动售货机的问题，用户有三个选择：
- 水2.可乐3.佳得乐 水=1美元，可乐=1.5美元，佳得乐=2美元
在从用户那里获取25美分、一角硬币、五分币和便士的输入后，我以美元计算总额。现在，我需要检查总量是否足以满足三种选择的饮料。如果金额低于成本，我需要提示用户再试一次，如果金额更大，则需要为您显示用户更改金额的消息。我相信这需要this循环和if，elif，else语句。以下是我目前的计划：
import sys
print('You have three drinks to choose from this Vending Machine: \n 1. Water \n 2. Cola \n 3. Gatorade')
water = 1.00
cola = 1.50
gatorade = 2.00
choice = 0
while not choice:
try:
choice = int(input('Please select any one of the three choices of drinks (1,2 or 3) from the list above'))
if choice not in (1,2,3):
raise ValueError
except ValueError:
choice = 0
print("That is not a valid choice ! Try again")
if choice == 1:
print("1. water = $1.00")
elif choice == 2:
print("2. cola = $1.50")
elif choice == 3:
print("3. gatorade = $2.00")
qrt = int(input("How many quarters did you insert ?"))
dm = int(input("How many dimes did you insert ?"))
nk = int(input("How many nickels did you insert ?"))
pn = int(input("How many pennies did you insert ?"))
total = qrt/4 + dm/10 + nk/20 + pn/100现在，我需要检查总金额(用户插入的)是否大于或低于他选择的饮料成本。
如果更大，我需要返回更改(显示更改数量的消息)。
如果较小，那么我需要提示用户尝试再次插入硬币。
我怎么能这么做？
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-04-10 04:50:14
我想这就是你需要做的。同时，根据您的需求，接受逻辑并修改代码。
别就这么抄了。希望能帮上忙。
import sys
print('You have three drinks to choose from this Vending Machine: \n 1. Water \n 2. Cola \n 3. Gatorade')
water = 1.00
cola = 1.50
gatorade = 2.00
choice = 0
while not choice:
try:
choice = int(input('Please select any one of the three choices of drinks (1,2 or 3) from the list above: '))
if choice not in (1,2,3):
raise ValueError
except ValueError:
choice = 0
print("That is not a valid choice ! Try again")
if choice == 1:
print("1. water = $1.00")
total_to_be = 1.00
elif choice == 2:
print("2. cola = $1.50")
total_to_be = 1.50
elif choice == 3:
print("3. gatorade = $2.00")
total_to_be = 2.00
qrt = int(input("How many quarters did you insert ?"))
dm = int(input("How many dimes did you insert ?"))
nk = int(input("How many nickels did you insert ?"))
pn = int(input("How many pennies did you insert ?"))
total = qrt/4 + dm/10 + nk/20 + pn/100
# total = round(total, 2)
while total != total_to_be:
if total >= total_to_be:
print(total)
break
else:
print("======================= Please try Again ================================")
qrt = int(input("How many quarters did you insert ?"))
dm = int(input("How many dimes did you insert ?"))
nk = int(input("How many nickels did you insert ?"))
pn = int(input("How many pennies did you insert ?"))
total = qrt/4 + dm/10 + nk/20 + pn/100页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/49745012
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