sure, here is an example of a program in Python that calculates the number of positive elements in an array:

def count_positive_elements(arr):
count = 0
for i in arr:
if i > 0:
count += 1
return count
# Example array
arr = [1, -2, 3, -4, 5, 6, -7, 8, 9]
result = count_positive_elements(arr)
print(f'The number of positive elements in the array is: {result}')

You can adjust the arr array with your own values to test the program. This program will count the number of positive elements in the array and print the result.