# import numpy library
import numpy as np

# create NumPy array
my_array = np.array([3, 5, 2, 1, 6, 9, 8, 4])

# find the largest number in numpy array
largest_num = np.max(my_array)
print("Largest number in array is", largest_num)

# print the index of largest number
print(np.where(my_array == largest_num))