python自动售货机

售货机"/>

python自动售货机

我想写一个程序来模拟自动售货机，并根据支付的金额计算出零钱(必须退还给你)。考虑到成本，首先应该提示用户添加更多的钱，直到支付满足/超过成本。在

假设所有的零钱都是用硬币换的，硬币的面额是：1c，5c，10c，25c，$1

这是我的计划：x = eval(input("Enter the cost (in cents):\n"))

b = 0

for i in range(x+500):

if x<5 and x>=b:

b += 1

print("Deposit a coin or note (in cents):")

print(1)

diff = b-x

for i in range(diff):

onecents = diff//1

new_onecents = diff - (onecents*1)

print("Your change is:")

if onecents != 0:

print(onecents,"x 1c")

break

elif x<10 and x>=b:

b += 5

print("Deposit a coin or note (in cents):")

print(5)

diff = b-x

for i in range(diff):

fivecents = diff//5

new_fivecents = diff - (fivecents*5)

onecents = new_fivecents//1

new_onecents = new_fivecents - (onecents*1)

print("Your change is:")

if fivecents != 0:

print(fivecents,"x 5c")

if onecents != 0:

print(onecents,"x 1c")

break

elif x<25 and x>=b:

b += 10

print("Deposit a coin or note (in cents):")

print(10)

diff = b-x

for i in range(diff):

tencents = diff//10

new_tencents = diff - (tencents*10)

fivecents = new_tencents//5

new_fivecents = new_tencents - (fivecents*5)

onecents = new_fivecents//1

new_onecents = new_fivecents - (onecents*1)

print("Your change is:")

if tencents !=0:

print(tencents,"x 10c")

if fivecents != 0:

print(fivecents,"x 5c")

if onecents != 0:

print(onecents,"x 1c")

break

elif x<100 and x>=b:

b += 25

print("Deposit a coin or note (in cents):")

print(25)

diff= b-x

for i in range(diff):

quarters = diff//25

new_quarters = diff - (quarters*25)

tencents = new_quarters//10

new_tencents = new_quarters - (tencents*10)

fivecents = new_tencents//5

new_fivecents = new_tencents - (fivecents*5)

onecents = new_fivecents//1

new_onecents = new_fivecents - (onecents*1)

print("Your change is:")

if quarters !=0:

print(quarters,"x 25c")

if tencents !=0:

print(tencents,"x 10c")

if fivecents != 0:

print(fivecents,"x 5c")

if onecents != 0:

print(onecents,"x 1c")

break

elif x<500 and x>b:

print("Deposit a coin or note (in cents):")

print(100)

b += 100

diff = b-x

for i in range(diff):

quarters = diff//25

new_quarters = diff - (quarters*25)

tencents = new_quarters//10

new_tencents = new_quarters - (tencents*10)

fivecents = new_tencents//5

new_fivecents = new_tencents - (fivecents*5)

onecents = new_fivecents//1

new_onecents = new_fivecents - (onecents*1)

print("Your change is:")

if quarters !=0:

print(quarters,"x 25c")

if tencents !=0:

print(tencents,"x 10c")

if fivecents != 0:

print(fivecents,"x 5c")

if onecents != 0:

print(onecents,"x 1c")

break

elif x=b:

print("Deposit a coin or note (in cents):")

print(500)

b += 500

diff = b-x

for i in range(diff):

onedollars = diff//100

new_onedollars = diff - (onedollars * 100)

quarters = new_onedollars//25

new_quarters = new_onedollars - (quarters*25)

tencents = new_quarters//10

new_tencents = new_quarters - (tencents*10)

fivecents = new_tencents//5

new_fivecents = new_tencents - (fivecents*5)

onecents = new_fivecents//1

new_onecents = new_fivecents - (onecents*1)

print("Your change is:")

if onedollars != 0:

print(onedollars,"x $1")

if quarters !=0:

print(quarters,"x 25c")

if tencents !=0:

print(tencents,"x 10c")

if fivecents != 0:

print(fivecents,"x 5c")

if onecents != 0:

print(onecents,"x 1c")

break

当我运行此程序并按照说明操作时，它应该如下所示：

^{pr2}$

相反，我得到：Enter the cost (in cents):

1000

Deposit a coin or note (in cents):

500

Deposit a coin or note (in cents):

500

Deposit a coin or note (in cents):

500

Your change is:

5 x $1

另一个预期产出：Enter the cost (in cents):

3

Deposit a coin or note (in cents):

1

Deposit a coin or note (in cents):

1

Deposit a coin or note (in cents):

1

但是我得到：Enter the cost (in cents):

3

Deposit a coin or note (in cents):

1

Deposit a coin or note (in cents):

1

Deposit a coin or note (in cents):

1

Deposit a coin or note (in cents):

1

Your change is:

1 x 1c

其余的都是正确的。在

谢谢你们所有的帮手(尤其是@jornsharpe)。以下是解决方案(以代码形式)：def vend():

"""Simulate a vending machine, taking user input and returning remainder."""

total = eval(input("Enter the cost (in cents):\n"))

inserted = 0

while inserted < total:

inserted += eval(input("Deposit a coin or note (in cents):\n"))

if inserted > total:

sum = inserted - total

if sum != 0:

print("Your change is:")

dollars = sum//100

if dollars != 0:

print(dollars,'x $1')

quarters = (sum - dollars*100)//25

if quarters != 0:

print(quarters,'x 25c')

ten_cents = (sum - dollars*100 - quarters*25)//10

if ten_cents != 0:

print(ten_cents,'x 10c')

five_cents = (sum - dollars*100 - quarters*25 - ten_cents*10)//5

if five_cents != 0:

print(five_cents,'x 5c')

one_cents = (sum - dollars*100 - quarters*25 - ten_cents*10 - five_cents*5)//1

if one_cents != 0:

print(one_cents,'x 1c')

vend()