Add some cool queue, stacks, strings, math, bit manipulation examples (#35)

bit_manipulation/README.md

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+## bit manipulation
+
+<br>
+
+### `playing_with_bits.py`
+
+<br>
+
+
+```python
+> python3 playing_with_bits.py
+
+Integer number: 144
+Binary number: 10010000
+
+Update bit: 0b10010100
+Set bit: 0b10010100
+Clear bit: 0b10000000
+
+I: 144, I2: 90
+B: 10010000, B2: 01011010
+Count bits swapped: 4
+
+Swap bit in place: (90, 144)
+```

bit_manipulation/playing_with_bits.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
+
+def set_bit(num, i):
+    mask = 1 << i
+    return bin( num | mask )
+
+def update_bit(num, i, v):
+    mask = ~ (1 << i)
+    return bin( (num & mask) | (v << i) )
+
+def count_bits_swapped(a, b):
+    count = 0
+    m = a^b
+    while m:
+        count +=1
+        m = m & (m-1)
+    return count
+
+def clear_bit(num, i):
+    mask = ~ (1 << i)   # -0b10001
+    return bin(num & mask)
+
+def swap_bit_in_place(a, b):
+    a = a^b
+    b = a^b
+    a = a^b
+    return a, b
+
+def find_how_many_1_in_a_binary(num):
+
+    counter = 0
+    while num:
+        if num & 1:
+            counter += 1
+        num >>= 1
+    return counter
+
+
+if __name__ == '__main__':
+
+    binary_number = '10010000'
+    binary_number2 = '01011010'
+    integer_number = int(binary_number, 2)
+    integer_number2 = int(binary_number2, 2)
+
+    print(f'Integer number: {integer_number}')
+    print(f'Binary number: {binary_number}')
+    print(f'\nUpdate bit: {update_bit(integer_number, 2, 1)}') 
+    print(f'Set bit: {set_bit(integer_number, 2)}')
+    print(f'Clear bit: {clear_bit(integer_number, 4)}')
+    print(f'\nI: {integer_number}, I2: {integer_number2}')
+    print(f'B: {binary_number}, B2: {binary_number2}')
+    print(f'Count bits swapped: {count_bits_swapped(integer_number, integer_number2)}')
+    print(f'\nSwap bit in place: {swap_bit_in_place(integer_number, integer_number2)}')
+    print(f'Find how many 1 in a binary: {find_how_many_1_in_a_binary(integer_number)}')
+