filter c

#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>

void printOk(int arr[], int n, bool (*f)(int)) {
  for (int i = 0; i < n; i++) {
    if (f(arr[i])) {
      printf("%d: %d\n", i, arr[i]);
    }
  }
}

bool isOdd(int x) {
  return x & 1;
}

int main(void) {
  int n;
  scanf("%d", &n);
  int *arr = calloc(sizeof(int), n);
  for (int i = 0; i < n; i++) {
    scanf("%d", arr + i);
  }
  printOk(arr, n, isOdd);
  return 0;
}