The first and second numbers in the Fibonacci sequence are both 1. After that, each subsequent number is the sum of the two preceding numbers. The first several numbers in the sequence are: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, etc. Write a function named fib that takes a positive integer parameter and returns the number at that position of the Fibonacci sequence. For example fib(1)

In Python:

def fib(nterms):

   n1, n2 = 1, 1

   count = 0

   while count < nterms:

       term = n1

       nth = n1 + n2

       n1 = n2

       n2 = nth

       count += 1

   return term

Explanation:

This line defines the function

def fib(nterms):

This line initializes the first and second terms to 1

   n1, n2 = 1, 1

This line initializes the Fibonacci count to 0

   count = 0

The following while loops gets the number at the position of nterms

  while count < nterms:

       term = n1

       nth = n1 + n2

       n1 = n2

       n2 = nth

       count += 1

This returns the Fibonnaci term

   return term

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