Lab 5 - Decrease values in array (by fixed value)

def decrease_array(a):
    n = a
    i = 0
    dec = 5
    print("Decrease Number is",dec)
    while(i < len(n)):
        print("Original Array n[",i,"] =",n[i])
        n[i] = n[i] - dec
        print("Decrease Array n[",i,"] =",n[i])
        print()
        i = i + 1

decrease_array([5, 6, 7, 8])