《Python语言程序设计 》第5章编程题答案（5.1-5.16）

wg19830119

5.1:

number=eval(input('enter an integer,the input ends if it is 0:'))

if number==0:

print('you didn\'t enter any number')

else:

sum1=0

sum2=0

count1=0

count2=0

while number!=0:

if number > 0:

sum1+=number

count1+=1

number=eval(input('enter an integer,the input ends if it is 0:'))

else:

sum2+=number

count2+=1

number=eval(input('enter an integer,the input ends if it is 0:'))

total=sum1+sum2

average=total/(count1+count2)

print('the total is',total)

print('the average is ',average)

5.2:

import random

import time

count=0

right_count=0

starttime=time.time()

while count < 5:

number1=random.randint(1,15)

number2=random.randint(1,15)

answer=eval(input('what is '+str(number1)+'+'+str(number2)+'?'))

if answer==number1+number2:

right_count+=1

print('right!')

else:

print('wrong!')

count+=1

endtime=time.time()

print('you are right '+str(right_count)+'in'+str(count)+'times','you spend '+str(int(endtime-starttime))+'s')

5.3:

print('-----------')

print(format('公斤','^3s')+'|'+format('磅','^3s'))

for i in range(1,20,2):

print('-'*5+'|'+'-'*5)

print(format(i,'^5d')+'|'+format(i*2.2,'^.1f'))

5.4:

print('-----------')

print(format('英里','^3s')+'|'+format('公里','^5s'))

for i in range(1,11):

print('-'*5+'|'+'-'*5)

print(format(i,'^5d')+'|'+format(i*1.609,'^.3f'))

5.5:

print('━'*25)

print(format('公斤','^3s')+'|'+format('磅','^5s')+'||'+format('公斤','^3s')+'|'+format('磅','^5s'))

j=20

for i in range(1,20,2):

    print('━'*25)

    print(format(i,'^5d')+'|'+format(i*2.2,'^6.1f')+'||'+format(j/2.2,'^5.2f')+'|'+format(j,'^5d'))

    j+=5

5.6:

print('━'*25)

print(format('英里','^3s')+'|'+format('公里','^5s')+'||'+format('英里','^3s')+'|'+format('公里','^5s'))

j=20

for i in range(1,20):

    print('━'*25)

    print(format(i,'^5d')+'|'+format(i*1.609,'^6.3f')+'||'+format(j/1.609,'^5.3f')+'|'+format(j,'^5d'))

    j+=5

5.7:

import math

print('━'*25)

print(format('度','^4s')+'|'+format('sin','^7s')+'|'+format('cos','^7s'))

for i in range(0,370,10):

    print('━'*25)

    print(format(i,'^5d')+'|'+format(str(round(math.sin(math.radians(i)),4)),'^7s')+\

        '|'+format(str(round(math.cos(math.radians(i)),4)),'^7s'))

5.8:

import math

print('━'*15)

print(format('Number','^4s')+'|'+format('Square Root','^7s'))

for i in range(0,21,2):

    print('━'*15)

    print(format(i,'^5d')+'|'+format(str(round(math.sqrt(i),4)),'^7s'))

5.9:

fees=10000

growth=1+0.05

for i in range(1,11):

    fees=fees*growth

    print('第'+str(i+1)+'年的学费为:'+str(round(fees)))

    fees1=fees

    fouryears_total=fees

    for j in range(3):

        fees1*=growth

        fouryears_total+=fees1

    print('第'+str(i+1)+'年的四年学费：'+str(round(fouryears_total)))

5.10:

number=eval(input('number is '))

print(number)

score=eval(input('score is'))

print(score)

print('max score is '+str(max(score)))

在cmd中输入‘cd C:\Users\beardool\Desktop\python code_wg’，再输入‘python 测试.py<score.txt’

5.11:

number=eval(input('number is '))

print(number)

score=eval(input('score is'))

print(score)

score=sorted(score)

print('the max scores is '+str(score[-1])+'and'+str(score[-2]))

定向输入与5.10一致

5.12：:

count=0

for i in range(100,1000):

if i % 5==0 and i % 6==0:

count+=1

print(i,end=' ')

if count % 10 ==0:

print()

5.13：

count=0

for i in range(100,1000):

if (i % 5==0 or i % 6==0) and not (i % 5==0 and i % 6==0):

count+=1

print(i,end=' ')

if count % 10 ==0:

print()

5.14:

n=0

while n*n<12000:

n+=1

else:

print(n)

5.15:

n=0

while n*n*n<12000:

n+=1

else:

print(n-1)

5.16:

n1=eval(input('n1:'))

n2=eval(input('n2:'))

if n1 > n2 :

n1,n2=n2,n1

d=n1

while (n1 % d !=0) or (n2 % d != 0):

d-=1

print(d)

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