Page 35 - Programming With Python 3

An Introduction to STEM Programming with Python — 2019-09-03a Page 22
Chapter 2 — Numbering Systems

And in Python we can do it, like:
Free

1| n = 364
2| while(n):
3| r = n % 2
4| n = n //2
5| print(n,r)
eBook

182 0
91 0
45 1
22 1
11 0
Edition
5 1
2 1
1 0
0 1

Binary to Decimal (Positional Method)
Please support this work at

To convert a binary number back to a decimal number we need to know our powers of 2 and just add
them together. http://syw2l.org

If the binary number 101101101 actually represents
4
3
5
7
6
2
8
1
Free
1×2 +0×2 +1×2 +1×2 +0×2 +1×2 +1×2 +0×2 +1×2 0 , then we should be able to add up the
powers of two that are multiplied by 1 and ignore the powers multiplied by zero. So,
8
5
3
2
6
0
101101101 =1×2 +1×2 +1×2 +1×2 +1×2 +1×2 =256+64+32+8+4+1=365 10 .
2
Examples:
Convert 100101011 2 to decimal:
1 0 0 1 0 1 0 1 1 eBook
256 32 8 2 1
Edition
299 10
In Python we could write

1| print(2**8 + 2**5 + 2**3 + 2 + 1)

Copyright 2019 — James M. Reneau Ph.D. — http://www.syw2l.org — This work is licensed
under a Creative Commons Attribution-ShareAlike 4.0 International License.