更改计算器，给出确切的更改类型

Question

说明是

创建一个程序，让他输入一定数量的零钱， 然后打印有多少 25 美分硬币、硬币、镍币和便士 需要弥补所需的金额。例如，如果他输入 1.47， 程序会告诉他需要 5 个硬币，2 个硬币，0 个镍币， 和 2 便士。

我真的不知道该怎么做，但我试了一下。我真的不确定该怎么做。

print "Change Calclator"

quarter = .25
dime = .10
nickel = .5
penny = .1

moneygiven = raw_input("Enter how much money given: ")
citem = raw_input("How much did the item cost?: ")
moneygiven = float(moneygiven)
citem = float(citem)
moneyback = moneygiven - citem

qmb = moneyback % quarter
partialtotal = moneyback - qmb * quarter 
dmb = partialtotal / dime
dpartialtotal = partialtotal - dmb * dime
nmb = dpartialtotal / nickel
npartialtotal = dpartialtotal - nmb * nickel
pmb = npartialtotal / penny
ppartialtotal = npartialtotal - pmb * penny

print "You need %s quarters, %s dimes, %s nickels, %s pennies." % (qmb, dmb, nmb, pmb)

当以 20 in moneygiven 和 19.45 in citem 运行时，它给出了这个

Change Calclator
Enter how much money given: 20
How much did the item cost?: 19.45
You need 2.2 quarters, 0.0 dimes, 0.0 nickels, 0.0 pennies.

Answer 1

开发@jonrsharpe 的评论，您应该使用持有便士的int 变量。这里的重点是您有 integer 数量的具有 float 值的硬币，并且在除法时将它们混合，从而得到奇怪的值。还要考虑到您应该使用正确的除法运算符。

这是一个工作版本：

print "Change Calclator"

quarter = 25
dime = 10
nickel = 5
penny = 1

moneygiven = raw_input("Enter how much money given: ")
citem = raw_input("How much did the item cost?: ")
moneygiven = int(float(moneygiven) * 100)
citem = int(float(citem) * 100)
moneyback = moneygiven - citem

qmb = moneyback / quarter
partialtotal = moneyback - qmb * quarter 
dmb = partialtotal // dime
dpartialtotal = partialtotal - dmb * dime
nmb = dpartialtotal // nickel
npartialtotal = dpartialtotal - nmb * nickel
pmb = npartialtotal // penny
ppartialtotal = npartialtotal - pmb * penny

print "You need %s quarters, %s dimes, %s nickels, %s pennies." % (qmb, dmb, nmb, pmb)

Answer 2

您应该使用 // 运算符而不是 / 运算符。 另一件事是 penny= .1 这与 penny=0.10 相同。你应该使用 0.01

// Floor Division - 操作数的除法，其结果是除去小数点后的数字的商。

例子：

 a=.25
.55//a = 2.0

代码工作

print "Change Calclator"

quarter = .25
dime = .10
nickel = .05
penny = .01

moneygiven = raw_input("Enter how much money given: ")
citem = raw_input("How much did the item cost?: ")
moneygiven = float(moneygiven)
citem = float(citem)
moneyback = moneygiven - citem

qmb = moneyback // quarter
partialtotal = moneyback - qmb * quarter 
dmb = partialtotal // dime
dpartialtotal = partialtotal - dmb * dime
nmb = dpartialtotal // nickel
npartialtotal = dpartialtotal - nmb * nickel
pmb = npartialtotal // penny
ppartialtotal = npartialtotal - pmb * penny

print "You need %s quarters, %s dimes, %s nickels, %s pennies." % (qmb, dmb, nmb, pmb)