浮点数作业

源代码如下：

传入一个浮点型字符串和有效数字位数

def fraction_to_binary(fraction_string, significant_binary_digits):
def print_binary(number_string, fraction_length):
dotleft=""

    netative="+"
    if float(number_string)<0:
        netative="-"
        

    if "." in number_string:
        a,b=number_string.split(".")
    else:
        a=number_string
    a=int(a)
    if a<0:
        a=-a
    result=[]
    def dec2bin(number):
        if number==1:
            result.insert(0,"1")
        elif number==0:
            result.insert(0,"0")
        else:
            if number%2==0:
                result.insert(0,"0")
                dec2bin(number//2)
            else:
                result.insert(0,"1")
                dec2bin(number//2)
    dec2bin(int(a))
    for i in result:
        dotleft+=i
    #print(dotleft)
    if "." in  number_string:

        number=float("0."+b)
        count=0
        dotright=""
        number=float("0."+b)
        while count<fraction_length:
            if number*2>=1:
                dotright=dotright+"1"
                number=number*2-1
                count+=1
            else:
                number*=2
                dotright=dotright+"0"
                count+=1
    else:
        dotright="0"*fraction_length
    temp=netative+dotleft+"."+dotright
    return temp[1:]

answer=print_binary(fraction_string, 15)
first_1=answer.index("1")
liebiao=list(answer[answer.index(".")+1:first_1+significant_binary_digits+1])
#print(liebiao)
#打印列表
for i in liebiao:
    print(i,end=" ")
print()
#列表打印完毕

#处理进位
woshigetemp=-1
liebiao.insert(0,"0")
if liebiao[-1]=="1":

    while 12138:
            if liebiao[woshigetemp]=="0":
            
            
                liebiao[woshigetemp]="1"
                break
            elif liebiao[woshigetemp]==".":
                pass
            
            else:
                liebiao[woshigetemp]="0"
            
            woshigetemp-=1
#print(liebiao[:-1])
###

###打印
print_str=""
#liebiao=liebiao[:-1]
liebiao=liebiao[:liebiao.index("1")+significant_binary_digits]
#print(liebiao)
liebiao.insert(1,".")
for i in liebiao:
    print_str+=i

print(print_str)