#第一题
defdec2bin_Int(dec):
binum=”
#请在此添加代码，补全函数dec2bin_Int
#———–Begin———-
whiledec!=0:
r=dec%2
ifr==1:
binum=binum+”1″
ifr==0:
binum=binum+”0″
dec=dec//2
#————End———–
returnbinum[::-1]
#第二题
defdec2bin_Point(dec,length):
binum=”
#请在此添加代码，补全函数dec2bin_Point
#———–Begin———-
len_=1
whiledec!=0andlen_<=length:
dec=dec*2
ifdec>1:
binum=binum+”1″
dec=dec-1
else:
binum=binum+”0″
len_+=1
#————End———–
return’0.’+binum
#第三题
defbin2oh(binum,oh):
result=”
ifoh==’o’:
#请在此添加代码，补全函数bin2oh
#———–Begin———-
length=len(binum)
whilelength%3!=0:
binum=’0’+binum
length=len(binum)
foriinrange(0,length,3):
i_result=int(binum[i])*4+int(binum[i+1])*2+int(binum[i+2])
result=result+str(i_result)
#————End———–
returnresult
elifoh==’h’:
#请在此添加代码，补全函数bin2oh
#———–Begin———-
length=len(binum)
whilelength%4!=0:
binum=’0’+binum
length=len(binum)
foriinrange(0,length,4):
i_result=int(binum[i])*8+int(binum[i+1])*4+int(binum[i+2])*2+int(binum[i+3])
dic={10:”A”,11:”B”,12:”C”,13:”D”,14:”E”,15:”F”}
ifi_result>=10:
i_result=dic[i_result]
result=result+str(i_result)
#————End———–
returnresult
fromrandomimport*
defmakechange(num):
changes={}
numint=int(num)
numdec=round(num-numint,2)
#请在此添加代码，补全函数makechange
#———–Begin———-
foriin[50,20,10,5,2,1]:
ifnumint>=i:
changes[i]=numint//i
numint=numint%i
numdec=numdec*100
foriin[0.5,0.2,0.1,0.05,0.02,0.01]:
ifnumdec>=i*100:
changes[i]=int(numdec//(i*100))
numdec=numdec%(i*100)
#————End———–
returnchanges
if__name__==’__main__’:
seed(0)
foriinrange(10):
num=round(random()*100,2)
print(sorted(makechange(num).items(),key=lambdaitem:item[0],reverse=True))
importmath
defencryptMessage(key,message):
#请在此添加代码，补全函数encryptMessage
#———–Begin———-
length=len(message)
whilelength%key!=0:
length+=1
message_key=””
foriinrange(key):
forjinrange(i,len(message),key):
message_key+=message[j]
returnmessage_key
#————End———–
defdecryptMessage(key,message):
#请在此添加代码，补全函数decryptMessage
#———–Begin———-
message_de=”
n=len(message)/key
ifn>len(message)//key:
n+=1
n=int(n)
m=n*key-len(message)
single=key-m
totle=0
foriinrange(n):
count=0
j=i
whilecount<keyandtotle<len(message):
ifcount>single:
j-=1
message_de+=message[j]
totle+=1
j+=n
count+=1
returnmessage_de
#————End———–
if__name__==’__main__’:
messages=[“Behindeverysuccessfulmanthere’salotofunsuccessfulyears.”,
‘Commonsenseisnotsocommon.’,
‘Therearenosecretstosuccess.Itistheresultofpreparation,hardwork,andlearningfromfailure.’,
‘Allthingsaredifficultbeforetheyareeasy.’]
formessageinmessages:
forkeyinrange(8,10):
encrytext=encryptMessage(key,message)
print(encrytext)
print(decryptMessage(key,encrytext))