Is there anyone can tell me why:

print int("11001001", 2) result is "201"? How to calculate it?

Thanks

`Replace this line with your code.`

Is there anyone can tell me why:

print int("11001001", 2) result is "201"? How to calculate it?

Thanks

`Replace this line with your code.`

Sure, the calculations are quite straightforward:

`bin(11001001) = dec(1 * 2^7 + 1 * 2^6 + 0 * 2^5 + 0 * 2^4 + 1 * 2^3 + 0 * 2^2 + 0 * 2^1 + 1 * 2^0)`

So every digit of a binary number represents a power of `2`

. We know that `0 * n = 0`

, so we are only interested in ones:

```
bin(11001001) = dec(1 * 2^7 + 1 * 2^6 + 1 * 2^3 + 1 * 2^0) =
dec(128 + 64 + 8 + 1) = dec(201)
```

You can learn more about binary numbers here -> https://en.wikipedia.org/wiki/Binary_number.

The second parameter returns the first parameter's base ten value which in this case is 201,

base ten value with a second parameter whose value is 2,

`"201"`

In addition to factoradic

Every bit is the n_th power of 2

2^0 = 1

2^1 = 2

2^2 = 4

2^3 = 8

2^4 = 16

" 1 1 0 0 1 0 0 1"

| | | | | | | |

2^7 2^6 2^5 2^4 2^3 2^2 2^1 2^0

" 1 1 0 0 1 0 0 1"

| | | | | | | |

128 64 32 16 8 4 2 1

then make a sum of the 1 bits.

" 1 1 0 0 1 0 0 1"

| | | | | | | |

128*1|--------------------------------> 128

64 *1---------------------------> 64

32*0-----------------------> 0

16*0------------------> 0

8*1---------------> 8

4*0----------> 0

2*0-------> 0

1*1----> 1

+_____

201

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