Sliding Window Sum

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    int cur_idx, sum = 0;
    while(n - cur_idx >= k)
    {
        sum = 0;
        for(int i = cur_idx; i < (k+cur_idx); i++)
        {
            sum += arr[i];
        }
        printf("%d ",sum);
        cur_idx++;
    }
}

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

    sliding_window_sum(arr, n, k);
    return 0;
}