add reverse_bits.py

Author: ayushbisht2001

Diff for: bit_manipulation/reverse_bits.py

@@ -0,0 +1,67 @@
+def get_reverse_bit_string(bn : int) -> str:
+    """    return the bit string of an interger
+    """
+    bit_string = ""
+    for trk in range(0, 32):
+        bit_string += str(bn % 2)
+        bn = bn >> 1
+    return bit_string
+
+
+def reverse_bit(n: int) -> str:
+    """
+    Take in an 32 bit integer, reverse its bits,
+    return a string of reverse bits
+
+    result of a reverse_bit and operation on the integer provided.
+
+    >>> reverse_bit(25)
+    '00000000000000000000000000011001'
+    >>> reverse_bit(37)
+    '00000000000000000000000000100101'
+    >>> reverse_bit(21)
+    '00000000000000000000000000010101'
+    >>> reverse_bit(58)
+    '00000000000000000000000000111010'
+    >>> reverse_bit(0)
+    '00000000000000000000000000000000'
+    >>> reverse_bit(256)
+    '00000000000000000000000100000000'
+    >>> reverse_bit(-1)
+    Traceback (most recent call last):
+        ...
+    ValueError: the value of input must be positive
+
+    >>> reverse_bit(1.1)
+    Traceback (most recent call last):
+        ...
+    TypeError: Input value must be a 'int' type
+
+    >>> reverse_bit("0")
+    Traceback (most recent call last):
+        ...
+    TypeError: '<' not supported between instances of 'str' and 'int'
+    """
+    if n < 0:
+        raise ValueError("the value of input must be positive")
+    elif isinstance(n, float):
+        raise TypeError("Input value must be a 'int' type")
+    elif isinstance(n, str):
+        raise TypeError("'<' not supported between instances of 'str' and 'int'")
+    ans = 0
+    # iterator over [1 to 32],since we are dealing with 32 bit integer
+    for i in range(1, 33):
+        # left shift the bits by unity
+        ans = ans << 1
+        # get the end bit
+        k = n % 2
+        # right shif the bits by unity
+        n = n >> 1
+        # add that bit to our ans
+        ans = ans | k
+    return get_reverse_bit_string(ans)
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()