Binary decimal conversion

solutions/binary_decimal_conversion.py

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+"""
+A module for converting between binary and decimal numbers.
+Created by Muna Sattouf on 29/12/2024
+Completed on 1/1/2025
+"""
+
+
+def decimal_to_binary(decimal: int) -> str:
+    """
+    This function takes a decimal number from command line as paramter,
+    and returns its binary representation.
+
+    Example: DecimalToBinary('binary', 392)
+    >>> 110001000
+
+    """
+    if not isinstance(decimal, int):
+        raise ValueError
+    """
+    Input must be an integer
+    """
+    if decimal < 0:
+        decimal = -decimal
+        return "-" + decimal_to_binary(decimal)
+    if decimal == 0:
+        return "0"
+    binarynumber = " "
+    while decimal > 0:
+        binarynumber = str(decimal % 2) + binarynumber
+        decimal = decimal // 2
+    return binarynumber
+
+
+def binary_to_decimal(binary: str) -> int:
+    """
+    This function takes a binary number from command line as paramter,
+    and returns its decimal representation.
+
+    Example: BinaryToDecimal('decimal', 10011101)
+    >>> 157
+    """
+    if not all(c in "01" for c in binary):
+        raise ValueError("Input must only contain 0s and 1s")
+    decimalnumber = 0
+    for c in binary:
+        decimalnumber = decimalnumber * 2 + int(c)
+    return decimalnumber
+
+
+def binary_decimal_conversion(conversion_type: str, number: str) -> str:
+    """
+    This is the main function: It 'coordinates' and decides
+    which of the two above functions to use
+    """
+    if conversion_type == "decimal":
+        if not all(c in "01" for c in number):
+            raise ValueError(
+                "If decimal conversion, input must be in binary, consisting only of 0 and 1"
+            )
+        return binary_to_decimal(number)
+    elif conversion_type == "binary":
+        if not number.isdigit():
+            raise ValueError("If binary conversion, input must be a positive integer")
+        decimal = int(number)
+        return decimal_to_binary(decimal)
+    else:
+        raise ValueError("Conversion Type must be 'binary' or 'decimal ' ")
+
+
+if __name__ == "__main__":
+    import sys
+
+    if len(sys.argv) != 3:
+        print(
+            "To use properly, the first argument is conversion type. the second is the number you want to convert."
+        )
+        sys.exit(1)
+
+    conversion_type = sys.argv[1].lower()
+    number = sys.argv[2]
+
+    if conversion_type not in ["binary", "decimal"]:
+        print("Error: Conversion type must be binary or decimal")
+        sys.exit(1)
+
+    if conversion_type == "decimal":
+        if not all(c in "01" for c in number):
+            print(
+                "Error: for decimal conversion, input must be in binary, containing only 1 and 0"
+            )
+            sys.exit(1)
+        result = binary_to_decimal(number)
+
+    elif conversion_type == "binary":
+        if not number.isdigit():
+            print("Error: for binary conversion, input must be positive integer")
+            sys.exit(1)
+        result = decimal_to_binary(int(number))
+    print(result)

solutions/tests/test_binary_decimal_conversion.py

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+"""
+Module: test_binary_decimal_conversion
+contains test cases for the solution code.
+
+Created by Muna Sattouf on January 2, 2024
+Completed on January 2, 2024
+"""
+import unittest
+from binary_decimal_conversion import decimal_to_binary, binary_decimal_conversion, binary_to_decimal
+
+class TestBinaryDecimalConversion(unittest.TestCase):
+
+    def test_decimal_to_binary(self):
+        """Should convert positive decimal numbers to binary"""
+        self.assertEqual(decimal_to_binary(10), '1010')
+
+    def test_binary_to_decimal(self):
+        """Should convert positive binary to decimal"""
+        self.assertEqual(binary_to_decimal(10011101), 157) 
+
+    def test_zero_decimal_to_binary(self):
+        """should return 0"""
+        self.assertEqual(decimal_to_binary(0), '0')
+
+    def test_zero_binary_to_decimal(self):
+        """should return 0"""
+        self.assertEqual(binary_to_decimal(0), '0')
+
+    def test_large_decimal_to_binary(self):
+        """Should correctly handle large decimal numbers"""
+        self.assertEqual(decimal_to_binary(1000000), '11110100001001000000')
+
+    def test_large_binary_to_decimal(self):
+        """Should correctly handle large binary numbers"""
+        self.assertEqual(binary_to_decimal('11110100001001000000'), 1000000)
+
+    def test_binarydecimalconversion_decimal(self):
+        """Should convert binary to decimal when conversion type is decimal"""
+        self.assertEqual(binary_decimal_conversion('decimal', '10011101'), 157)
+
+    def test_binarydecimalconversion_binary(self):
+        """Should convert decimal to binary when conversion type is binary"""
+        self.assertEqual(binary_decimal_conversion('binary', '392'), 110001000)
+
+    def test_invalid_decimal_input(self):
+        """Should raise ValueError for non-integer decimal input"""
+        with self.assertRaises(ValueError):
+            decimal_to_binary("notAnumber")
+
+    def test_invalid_binary_input(self):
+        """Should raise ValueError for non-binary input"""
+        with self.assertRaises(ValueError):
+            binary_to_decimal("1234")
+
+    def test_invalid_decimal_conversion_input(self):
+        """Should raise ValueError if a non-binary string is provided to convert to decimal"""
+        with self.assertRaises(ValueError):
+            binary_decimal_conversion("decimal", "1020")
+
+    def test_invalid_binary_conversion_input(self):
+        """Should raise ValueError if a non-integer was provided to convert to binary"""
+        with self.assertRaises(ValueError):
+            binary_decimal_conversion('binary', 'word')
+
+if __name__ == '__main__':
+    unittest.main()