Print Sum of Even Numbers

#include <stdio.h>

int sum_even_numbers(int *ptr, int n) {
    n = 0;
    while (*ptr) {
        n += (*ptr % 2) ? 0 : *ptr;
        ptr++;
    }
    return n;
}

int main() {
    int n;
    scanf("%d", &n);

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

    int result = sum_even_numbers(arr, n);

    printf("Sum = %d", result);

    return 0;
}