import sys
from numpy import zeros

#read the number of terms from command line
try:
    N = int(sys.argv[1])
except:
    print('Provide the number of terms as command line argument.')
    sys.exit(0)

x = zeros(N+1,int)

"""
For a second order diff eq we
need to initalize the first two values:"""
x[0] = 1
x[1] = 1

for n in range(2,N+1):
    x[n] = x[n-1]+x[n-2]
    print(n,x[n])
"""
Terminal> python fibonacci.py 8
2 2
3 3
4 5
5 8
6 13
7 21
8 34
(Choosing N large (>90) gives overflow error. This can be solved
by using another type of variable than numpy.int, but this is
not very relevant in IN1900.)
"""