《python语言程序设计》第2章编程题答案

wg19830119

2.1:

C=eval(input('输入摄氏温度：'))

fahrenhrit=(9/5)*C+32

print(str(C)+'Celsius is'+str(fahrenhrit)+'Farhrenheit')

2.2:

import math

radius,height=eval(input('输入圆柱体半径和高：'))

area=math.pi*radius**2

volume=area*height

print('The area is '+str(area))

print('The volume is'+str(volume))

2.3:

feet=eval(input('输入英尺数：'))

meters=0.305*feet

print(str(feet)+'feet is'+str(meters)+'meters')

2.4:

pounds=eval(input('输入磅数：'))

kilograms=0.454*pounds

print(str(pounds)+'pounds is'+str(kilograms)+'kilograms')

2.5:

subtotal,gratuity_rate=eval(input('输入小计和酬金率：'))

gratuity=subtotal*(gratuity_rate/100)

total=subtotal+gratuity

print('The gratuity is'+str(gratuity)+'and the total is'+str(total))

2.6:

number=eval(input('输入一个0~1000之间的整数：'))

if 0<number<1000:

   sum=(number % 10)+(number//10) % 10+(number//100)

   print('The sum of digits is'+str(sum))

else:

   print('输入错误')

2.7:

minutes=eval(input('输入分钟数：'))

days=(minutes//60) // 24

years=days//365

days=days%365

print(years,days)

2.8:

water_amount,initial_temperature,final_temperature=eval(input('输入水量，初始温度和最终温度：'))

energy=water_amount*(final_temperature-initial_temperature)*4184

print('The energy needed is'+str(energy))

2.9:

temp,wind_speed=eval(input('输入华氏温度和风速：'))

if -58<temp<41 and wind_speed>2:

   wind_chill=35.74+0.6215*temp-35.75*wind_speed**0.16+0.4275*temp*wind_speed**0.16

   print(wind_chill)

else:

   print('输入错误')

2.10:

speed,acceleration=eval(input('输入速度和加速度：'))

length=speed**2/(2*acceleration)

print('The minimum runway length for thisairplane is '+str(length)+'meters')

2.11:

final_value,years_rate,years=eval(input('输入最终金额，年利率和年数：'))

initial_vaule=final_value/(1+years_rate/12/100)**(years*12)

print('The initial deposit value is'+str(initial_vaule))

2.12:

print('a   b    a**b''\n'

   '1    2   1''\n'

       '2    3   8''\n'

            '3   4    81''\n'

                '4   5    1024''\n'

                    '5   6    15625')

2.13:

number=eval(input('输入一个四位整数：'))

print(number%10,number//10%10,number//100%10,number//1000)

2.14:

x1,y1,x2,y2,x3,y3=eval(input('输入三角形三个顶点的坐标：'))

side1=pow((x1-x2)**2+(y1-y2)**2,0.5)

side2=pow((x2-x3)**2+(y2-y3)**2,0.5)

side3=pow((x1-x3)**2+(y1-y3)**2,0.5)

s=(side1+side2+side3)/2

area=pow(s*(s-side1)*(s-side2)*(s-side3),0.5)

print('The area of the triangle is'+str(area))

2.15:

side=eval(input('输入正六边形边长：'))

area=3*3**0.5/2*side**2

print('The area of the hexagon is '+str(area))

2.16:

v0,v1,t=eval(input('输入初始速度，最终速度和时间：'))

a=(v1-v0)/t

print('The average acceleration is'+str(a))

2.17:

weight,hight=eval(input('输入以磅为单位的体重和以英尺为单位的身高：'))

bmi=weight*0.45359237/(hight*0.0254)**2

print('BMI is'+str(bmi))

2.18:

import time

time_zone=eval(input('输入时区：'))

all_seconds=int(time.time())

seconds=all_seconds % 60

minitues=all_seconds//60

hours=minitues // 60

minitues=hours % 60

hours=hours % 24

hours+=time_zone

print('The current time is'+str(hours)+':'+str(minitues)+':'+str(seconds))

2.19:

investment_amount,interest_rate,years=eval(input('输入金额，年利率，年数:'))

accumulated_value=investment_amount*(1+interest_rate/12/100)**(years*12)

print('accumulated value is '+str(accumulated_value))

2.20:

balance,interest_rate=eval(input('输入差额和年利率：'))

interest=balance*(interest_rate/1200)

print('The interest is'+str(interest))

2.21:

month_save=eval(input('每个月存款数：'))

month1_value=month_save*(1+0.00417)

month2_value=(month_save+month1_value)*(1+0.00417)

month3_value=(month_save+month2_value)*(1+0.00417)

month4_value=(month_save+month3_value)*(1+0.00417)

month5_value=(month_save+month4_value)*(1+0.00417)

month6_value=(month_save+month5_value)*(1+0.00417)

print('After the sixth month,the account valueis'+str(month6_value))

2.22:

years=eval(input('输入年数'))

all_seconds=years*365*24*60*60

people=3120324986+all_seconds//7-all_seconds//13+all_seconds//45

print('The population in 5 years is'+str(people))

2.23:

from turtle import*

radise=eval(input('输入半径：'))

penup()

goto(radise,0)

pendown()

circle(radise)

right(180)

circle(radise)

penup()

goto(-radise,0)

pendown()

circle(radise)

right(180)

circle(radise)

done()

2.24:

from turtle import*

penup()

goto(100,0)

pendown()

circle(100,steps=6)

right(180)

circle(100,steps=6)

penup()

goto(-100,0)

pendown()

circle(100,steps=6)

right(180)

circle(100,steps=6)

done()

2.25:

from turtle import*

x1,y1,length,width=eval(input('输入矩形中心、长和宽'))

penup()

goto(x1,y1)

goto(x1+length/2,y1)

pendown()

left(90)

forward(width/2)

left(90)

forward(length)

left(90)

forward(width)

left(90)

forward(length)

left(90)

forward(width/2)

done()

2.26:

from turtle import*

import math

x1,y1,radise=eval(input('输入圆心和半径：'))

penup()

goto(x1,y1-radise)

pendown()

circle(radise)

penup()

goto(x1,y1)

pendown()

write(math.pi*radise**2)

done()

577214302

呵呵。。。

Lowell

为了三千积分！

zhangyu

无论是不是沙发都得回复下

MemoForward

为保住菊花，这个一定得回复！