《Python语言程序设计》 第5章编程题答案（5.23-5.30）

wg19830119

5.23:

loanamount=eval(input('enter loanamount:'))

loanyears=eval(input('enter number ofyears for loan:'))

year_rate=eval(input('enter the rateof year:'))

print('Interest Rate   Monthly Payment    Total Payment')

while year_rate <= 8.000:

   month_rate=year_rate/1200

   month_payment=loanamount*month_rate/(1-1/(1+month_rate)**(loanyears*12))

print(format(year_rate,'10.3f')+'%'+format(month_payment,'10.2f')+format(month_payment*12*5,'10.2f'))

   year_rate+=0.125

5.24:

loanamount=eval(input('enter loanamount:'))

loanyears=eval(input('enter number ofyears for loan:'))

year_rate=eval(input('enter the rateof year:'))

month_rate=year_rate/1200

month_payment=loanamount*month_rate/(1-1/(1+month_rate)**(loanyears*12))

total_payment=month_payment*12*loanyears

balance=loanamount

print(format(month_payment,'.2f'))

print(format(total_payment,'.2f'))

print('payment#\tInterest\tPrincipal\tBalance')

for i inrange(1,loanyears*12+1):

   interest=month_rate*balance

   principal=month_payment-interest

   balance=balance-principal

print(i,'\t\t',format(interest,'.2f'),'\t\t',format(principal,'.2f'),'\t',format(balance,'.2f'))

5.25:

#左往右：

n=50000

sum=0

for i inrange(1,n+1):

sum+=1/i

print(sum)

#结果：11.397003949278504

#右往左

n=50000

sum=0

for i inrange(n,0,-1):

sum+=1/i

print(sum)

#结果：11.397003949278519

5.26:

i=99

sum=0

while i >= 3 :

   sum += (i-2) / i

   i-=2

print(sum)

5.27:

i=1

pi=0

number=10000

for j inrange(10):

while i <= number :

       pi+=4*((-1)**(i+1)/(2*i-1))

       i+=1

   number+=10000

print(pi)

5.28:

for i inrange(1,11,1):

   item=0

while i >= 1:

       n=1/i

for j inrange(1,i):

           n=n*(1/(i-j))

       item=item+n*i

       i-=1

print(item)

5.29:

count=0

is_leapyear=True

for i in range(2001,2101):

   if i % 400 == 0 or (i % 4 == 0 and i % 100 != 0):

       is_leapyear=True

   else:

       is_leapyear=False

   if is_leapyear:

       count+=1

       print(i,end=',')

       if count % 10 ==0:

            print()

5.30:

year=eval(input('enter the year of you want :'))

what_day=eval(input('enter the first day of one year: '))

FebFirstDay=(what_day+31 % 7) % 7

if year % 400 ==0 or (year % 4 == 0 and year % 100 != 0):

   MarFirstDay=(FebFirstDay+29 % 7) % 7

else:

   MarFirstDay=(FebFirstDay+28 % 7) % 7

AprFirstDay=(MarFirstDay+31 % 7) % 7

MayFirstDay=(AprFirstDay+30 % 7) % 7

JunFirstDay=(MayFirstDay+31 % 7) % 7

JulFirstDay=(JunFirstDay+30 % 7) % 7

AugFirstDay=(JulFirstDay+31 % 7) % 7

SepFirstDay=(AugFirstDay+31 % 7) % 7

OctFirstDay=(SepFirstDay+30 % 7) % 7

NovFirstDay=(OctFirstDay+31 % 7) % 7

DecFirstDay=(NovFirstDay+30 % 7) % 7

print(FebFirstDay,MarFirstDay,AprFirstDay,MayFirstDay,JunFirstDay,JulFirstDay,

AugFirstDay,SepFirstDay,OctFirstDay,NovFirstDay,DecFirstDay)

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景心111

好，很好，非常好！

oldpan

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Nicky

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