Add function for xor gate

boolean_algebra/xor_gate.py

@@ -0,0 +1,55 @@
+"""
+A XOR Gate is a logic gate in boolean algebra which results to True(1)
+if only one of the two inputs is 1, and False(0) if even number
+of inputs are 1.
+Following is the truth table of a XOR Gate:
+    ------------------------------
+    | Input 1 | Input 2 | Output |
+    ------------------------------
+    |    0    |    0    |    0   |
+    |    0    |    1    |    1   |
+    |    1    |    0    |    1   |
+    |    1    |    1    |    0   |
+    ------------------------------
+
+Refer - https://www.geeksforgeeks.org/logic-gates-in-python/
+"""
+
+
+def xor_gate(input_1: int, input_2: int) -> int:
+    """
+    calculate xor of the input values
+
+    >>> xor_gate(0, 0)
+    0
+    >>> xor_gate(0, 1)
+    1
+    >>> xor_gate(1, 0)
+    1
+    >>> xor_gate(1, 1)
+    0
+    """
+    num_ones = 0
+
+    if input_1 != 0:
+        num_ones += 1
+
+    if input_2 != 0:
+        num_ones += 1
+
+    return int(num_ones % 2 != 0)
+
+
+def test_xor_gate() -> None:
+    """
+    Tests the xor_gate function
+    """
+    assert xor_gate(0, 0) == 0
+    assert xor_gate(0, 1) == 1
+    assert xor_gate(1, 0) == 1
+    assert xor_gate(1, 1) == 0
+
+
+if __name__ == "__main__":
+    print(xor_gate(0, 0))
+    print(xor_gate(0, 1))