"""
A NOR Gate is a logic gate in boolean algebra which results to false(0)
if any of the input is 1, and True(1) if  both the inputs are 0.
Following is the truth table of a NOR Gate:
   | Input 1 | Input 2 |  Output |
   |      0      |     0      |      1      |
   |      0      |     1      |      0      |
   |      1      |     0      |      0      |
   |      1      |     1      |      0      |

Following is the code implementation of the NOR Gate
"""


def nor_gate(input_1: int, input_2: int) -> int:
    """
    >>> nor_gate(0, 0)
    1
    >>> nor_gate(0, 1)
    0
    >>> nor_gate(1, 0)
    0
    >>> nor_gate(1, 1)
    0
    >>> nor_gate(0.0, 0.0)
    1
    >>> nor_gate(0, -7)
    0
    """
    return int(input_1 == input_2 == 0)


def main() -> None:
    print("Truth Table of NOR Gate:")
    print("|   Input 1   |  Input 2  | Output |")
    print(f"|      0      |    0      |  {nor_gate(0, 0)}     |")
    print(f"|      0      |    1      |  {nor_gate(0, 1)}     |")
    print(f"|      1      |    0      |  {nor_gate(1, 0)}     |")
    print(f"|      1      |    1      |  {nor_gate(1, 1)}     |")


if __name__ == "__main__":
    import doctest

    doctest.testmod()
    main()
"""Code provided by Akshaj Vishwanathan"""
"""Reference: https://www.geeksforgeeks.org/logic-gates-in-python/"""