Checksum Validation

Code

#include <stdio.h>

int validate_checksum(int *mem, int n) {
   if (n < 1) return 0;  // No elements to check

    int checksum = 0;
    int *p = mem;

    for (int i = 0; i < n - 1; ++i, ++p) {
        checksum ^= *p;  // XOR all data bytes
    }

    // Now p points to mem[n - 1], the checksum byte
    return (*p == checksum) ? 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