Added binary to decimal, decimal to binary, hex to decimal and decimal to hex implementations

Author: OmkarPathak

pygorithm/math/conversion.py

@@ -0,0 +1,102 @@
+"""
+Author: OMKAR PATHAK
+Created On: 23 August 2017
+"""
+
+def decimal_to_binary(number):
+    '''
+        This function calculates the binary of the given decimal number
+        :param number: decimal number in string or integer format
+        :return : string of the equivalent binary number
+
+        Algo:
+        1. Divide the decimal number by 2. Treat the division as an integer division.
+        2. Write down the remainder (in binary).
+        3. Divide the result again by 2. Treat the division as an integer division.
+        4. Repeat step 2 and 3 until result is 0.
+        5. The binary value is the digit sequence of the remainders from the last to first.
+    '''
+    if isinstance(number, str):
+        number = int(number)
+    binary = []
+    while number >= 1:
+        remainder = number % 2
+        binary.append(remainder)
+        number = number // 2
+
+    return ''.join(map(str, binary[::-1]))
+
+def binary_to_decimal(number):
+    '''
+        This function calculates the decimal of the given binary number
+        :param number: decimal number in string or integer format
+        :return : integer of the equivalent decimal number
+
+        Algo:
+        1. Get the last digit of the binary number.
+        2. Multiply the current digit with (2^power), store the result.
+        3. Increment power by 1.
+        4. Repeat from step 2 until all digits have been multiplied.
+        5. Sum the result of step 2 to get the answer number.
+    '''
+    decimal = []
+    number = list(str(number)[::-1])
+    for i in range(len(number)):
+        decimal.append(int(number[i]) * (2 ** i))
+
+    return sum(decimal)
+
+def decimal_to_hex(number):
+    '''
+        This function calculates the hex of the given decimal number
+        :param number: decimal number in string or integer format
+        :return : string of the equivalent hex number
+
+        Algo:
+        1. Divide the decimal number by 16. Treat the division as an integer division.
+        2. Write down the remainder (in hexadecimal).
+        3. Divide the result again by 16. Treat the division as an integer division.
+        4. Repeat step 2 and 3 until result is 0.
+        5. The hex value is the digit sequence of the remainders from the last to first.
+    '''
+    if isinstance(number, str):
+        number = int(number)
+    hexadec = []
+    hex_equivalents = {10:'A', 11:'B', 12:'C', 13:'D', 14:'E', 15:'F'}
+    while number >= 1:
+        remainder = number % 16
+        if remainder < 10:
+            hexadec.append(remainder)
+        elif remainder >= 10:
+            hexadec.append(hex_equivalents[remainder])
+
+        number = number // 16
+
+    return ''.join(map(str, hexadec[::-1]))
+
+def hex_to_decimal(number):
+    '''
+        This function calculates the decimal of the given hex number
+        :param number: hex number in string or integer format
+        :return : integer of the equivalent decimal number
+
+        Algo:
+        1. Get the last digit of the hex number.
+        2. Multiply the current digit with (16^power), store the result.
+        3. Increment power by 1.
+        4. Repeat from step 2 until all digits have been multiplied.
+        5. Sum the result of step 2 to get the answer number.
+    '''
+    decimal = []
+    decimal_equivalents = {'A':10, 'B':11, 'C':12, 'D':13, 'E':14, 'F':15}
+    number = list(str(number)[::-1])
+    for i in range(len(number)):
+        try:
+            if int(number[i]) < 10:
+                decimal.append(int(number[i]) * (16 ** i))
+        except ValueError:
+            decimal.append(decimal_equivalents[number[i]] * (16 ** i))
+
+    return sum(decimal)
+
+print(hex_to_decimal('7DE'))