Created power_of_n.py and made relevant changes

power_of_n.py

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+# Assign values to author and version.
+__author__ = "Himanshu Gupta"
+__version__ = "1.0.0"
+__date__ = "2023-09-03"
+
+def binaryExponentiation(x: float, n: int) -> float:
+    """
+    Function to calculate x raised to the power n (i.e., x^n) where x is a float number and n is an integer and it will return float value
+
+    Example 1:
+
+    Input: x = 2.00000, n = 10
+    Output: 1024.0
+    Example 2:
+
+    Input: x = 2.10000, n = 3
+    Output: 9.261000000000001
+
+    Example 3:
+
+    Input: x = 2.00000, n = -2
+    Output: 0.25
+    Explanation: 2^-2 = 1/(2^2) = 1/4 = 0.25
+    """
+
+    if n == 0:
+        return 1
+
+    # Handle case where, n < 0.
+    if n < 0:
+        n = -1 * n
+        x = 1.0 / x
+
+    # Perform Binary Exponentiation.
+    result = 1
+    while n != 0:
+        # If 'n' is odd we multiply result with 'x' and reduce 'n' by '1'.
+        if n % 2 == 1:
+            result *= x
+            n -= 1
+        # We square 'x' and reduce 'n' by half, x^n => (x^2)^(n/2).
+        x *= x
+        n //= 2
+    return result
+
+
+if __name__ == "__main__":
+    print(f"Author: {__author__}")
+    print(f"Version: {__version__}")
+    print(f"Function Documentation: {binaryExponentiation.__doc__}")
+    print(f"Date: {__date__}")
+
+    print() # Blank Line
+
+    print(binaryExponentiation(2.00000, 10))
+    print(binaryExponentiation(2.10000, 3))
+    print(binaryExponentiation(2.00000, -2))
+