Checksum Validation

Code

#include <stdio.h>

int validate_checksum(int *mem, int n) {
   unsigned char xor_val = 0;

    // XOR all data bytes (excluding checksum)
    for (int i = 0; i < n - 1; i++) {
        xor_val ^= (unsigned char)mem[i];
    }

    // Compare with checksum byte
    return (xor_val == (unsigned char)mem[n - 1]) ? 1 : 0;
}

int main() {
    int n, arr[100];
    scanf("%d", &n);
    
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }

    int result = validate_checksum(arr, n);
    printf("%d", result);

    return 0;
}

Solving Approach