array and its sum, C (gcc)

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#include <stdio.h>

int is_even(int number);
int is_odd(int number);
int count_even_in_array(int a[]);
int count_odd_in_array(int a[]);
void print_numbers(int a[]);
int sum_of_positive_even_numbers(int a[]);
int sum_of_positive_odd_numbers(int a[]);
int is_positive(int number);

int main(void) 
{
  int a[10] = {-1, -2, 3, 4, -5, 6, 7, -8, 9,10};
  print_numbers(a);
  return 0;
}

int is_even( int number)
{
  if(number % 2 == 0)
  {
    return 1;
  }
return 0;
}

int is_odd(int number)
{
  if(number % 2 != 0)
  {
    return 1;
  }
return 0;
}

int count_even_in_array(int a[])
{
 int i = 0, count_even_numbers = 0;
 for(i = 0; i < 10 ; i++)
 {
   if(is_even(a[i]))
   {
     count_even_numbers++;
   }
 }
return count_even_numbers;
}

int count_odd_in_array(int a[])
{
 int i = 0, count_odd_numbers = 0;
 for(i = 0; i < 10 ; i++)
 {
   if(is_odd(a[i]))
   {
     count_odd_numbers++;
   }
 }
return count_odd_numbers ;
}

void print_numbers(int a[])
{
  int i; 
  printf("The elements in the array are");
  for(i = 0; i < 9; i++)
  {
    printf(" %3d", a[i]);
  }
  printf(" and %d", a[i]);
  printf("\nThe even numbers in the array ");
  for(i = 0; i < 10 ; i++)
  {
    printf(" %d ", a[i]);
  }
  printf("= %d",count_even_in_array(a));
  printf("\nThe odd numbers in the array ");
  for(i = 0;i < 10 ; i++)
  {
    printf(" %d ", a[i]);
  }
  printf("= %d", count_odd_in_array(a));
  printf("\nThe sum of positive even numbers in the array is  %d",sum_of_positive_even_numbers(a));
  printf("\nThe sum of positive odd numbers in the array is  %d",sum_of_positive_odd_numbers(a));
}

int sum_of_positive_even_numbers(int a[])
{
 int i, sum = 0;
 for(i = 0; i < 10; i++)
 {
   if(is_even(a[i]) && is_positive(a[i] ))
   {
     sum = sum + a[i];
   }
 }
 return sum;
}

int sum_of_positive_odd_numbers(int a[])
{
 int i, sum = 0;
 for(i = 0; i < 10; i++)
 {
   if(is_odd(a[i]) && is_positive(a[i] ))
   {
     sum = sum + a[i];
   }
 }
 return sum;
}

int is_positive(int number)
{
  if(number >= 1)
  {
    return 1;
  }
return 0;
}

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Compilation time: 0.12 sec, absolute running time: 0.07 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 0,2 sec