Parity bit checker

#include <stdio.h>

#include <string.h>

int main() {

    char binary[100], parity;

    int count = 0;

    // Input received binary and parity type

    printf("Enter received binary: ");

    scanf("%s", binary);

    printf("Choose parity - even (e) or odd (o): ");

    scanf(" %c", &parity);

    // Count 1's excluding the parity bit

    for (int i = 0; i < strlen(binary) - 1; i++)

    {

        if (binary[i] == '1')

        {

            count++;

        }

    }

    // Verify the parity bit

    char expected_parity = ((parity == 'e') == (count % 2 == 0)) ? '0' : '1';

    printf("The data is %s.\n", (binary[strlen(binary) - 1] == expected_parity) ? "valid" : "invalid");

    return 0;

}