#include <stdbool.h>
#include <stdio.h>
int main()
{
  bool = arr[2] = {true, false};
  int end = 10;
  for (int i=0; i<end; i++) {
    printf("%d is even %d\n", i, isEven(i));
    printf("%d is odd %d\n", i, isOdd(i));
  }
}


bool isEven(int a) {
  if (a % 2 == 0) true;
  else return false;
}
bool isOdd(int a) {
  if (a % 2 != 0) true;
  else return false;
}