Converting binary to decimal integer output

Question

I need to convert a binary input into a decimal integer  I know how to go from a decimal to a binary   n   int raw input  enter a number      print   0 b   format n    I need to go in the reverse direction  My professor said that when he checks our code  he is going to input 11001  and he should get 25 back  I ve looked through our notes  and I cannot figure out how to do this  Google and other internet resources haven t been much help either   The biggest problem is that we are not allowed to use built-in functions  I understand why we are not allowed to use them  but it s making this problem much more difficult  since I know Python has a built-in function for binary to decimal

User · Answer

Try this solution   def binary int to decimal binary       n   0     for d in binary          n   n   2   d      return n

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a   input  Enter a binary number      ar    int i  for  i in a  ar    ar   -1  res      for i in range len ar        res append ar i   2  i   sum res   sum res        print  Decimal Number is     sum res

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This is the full thing   binary   input  enter a number     decimal   0 for digit in binary  decimal  decimal 2   int digit   print  decimal

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If you want need to do it without int   sum int c     2    i  for i  c in enumerate s   -1      This reverses the string  s   -1    gets each character c and its index i  for i  c in enumerate    multiplies the integer of the character  int c   by two to the power of the index  2    i  then adds them all together  sum

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Binary to Decimal  int binaryString  2    Decimal to Binary  format decimal   b

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I started working on this problem a long time ago  trying to write my own binary to decimal converter function  I don t actually know how to convert decimal to binary though  I just revisited it today and figured it out and this is what I came up with  I m not sure if this is what you need  but here it is   def   degree number       power   1      while number    10  power     number          power    1      return power  def   getDigits number       digits          degree     degree number       for x in range 0  degree           digits append int   number    10   degree-x    -  number    10   degree-x-1        10   degree-x-1         return digits  def binaryToDecimal number       list     getDigits number      decimalValue   0     for x in range 0  len list            if  list x  is 1               decimalValue    2   len list  - x - 1      return decimalValue   Again  I m still learning Python just on my own  hopefully this helps  The first function determines how many digits there are  the second function actually figures out they are and returns them in a list  and the third function is the only one you actually need to call  and it calculates the decimal value  If your teacher actually wanted you to write your own converter  this works  I haven t tested it with every number  but it seems to work perfectly  I m sure you ll all find the bugs for me  So anyway  I just called it like   binaryNum   int input  Enter a binary number       print binaryToDecimal binaryNum     This prints out the correct result  Cheers

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You can use int and set the base to 2  for binary     gt  gt  gt  binary   raw input  enter a number     enter a number  11001  gt  gt  gt  int binary  2  25  gt  gt  gt      However  if you cannot use int like that  then you could always do this   binary   raw input  enter a number     decimal   0 for digit in binary      decimal   decimal 2   int digit  print decimal   Below is a demonstration    gt  gt  gt  binary   raw input  enter a number     enter a number  11001  gt  gt  gt  decimal   0  gt  gt  gt  for digit in binary          decimal   decimal 2   int digit       gt  gt  gt  print decimal 25  gt  gt  gt

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The input may be string or integer   num   1000   or num    1000    sum map lambda x  x 1   2  x 0    enumerate map int  str num     -1        8

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There is actually a much faster alternative to convert binary numbers to decimal  based on artificial intelligence  linear regression  model   Train an AI algorithm to convert 32-binary number to decimal based  Predict a decimal representation from 32-binary   See example and time comparison below  from sklearn linear model import LinearRegression from sklearn model selection import train test split import numpy as np  y   np random randint 0  2  32  size 10 000   def gen x y        x   bin y  2       n   32 - len  x      return  int sym  for sym in  0  n    x   X   np array  gen x x  for x in y    model   LinearRegression   model fit X  y   def convert bin to dec ai array       return model predict array   y pred   convert bin to dec ai X   Time comparison   This AI solution converts numbers almost x10 times faster than conventional way

[python] Converting binary to decimal integer output

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