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How to print the Fibonacci series in Ruby using a while loop
okwudili onyejiaku
Overview
A Fibonacci series is a series of numbers in which the next number is the sum of the previous two numbers. The first two numbers are 0 and 1. The third number is the sum of the previous two, and so on.
For example, the following is a Fibonacci series: 0, 1, 1, 2, 3, 5 .... If we see the number 5, it is the sum of the previous two numbers, which are 2 and 3.
In this shot, we'll print the first nth terms of the Fibonacci series in Ruby using while loop.
Syntax
while(counter < n + 1)
if(counter <= 1)
nextTerm = c
else
nextTerm = firstTerm + secondTerm
firstTerm = secondTerm
secondTerm = nextTerm
end
counter += 1
endSyntax to print the Fibonacci Series in Ruby
Parameters
counter: This serves as the counter for our loop.
n: This represents thenthnumber of terms of the Fibonacci series we want to get.
nextTerm: This represents the next term as the series progresses.
firstTerm: This represents the first term of the series as the loop progresses.
secondTerm: This represents the second term of the series as the loop progresses.
Return value
It prints the first nth terms of a Fibonacci series.
Example
# create a function to get Fibonacii series
def getFibonacci(n)
firstTerm = 0
secondTerm = 1
nextTerm = 0
counter = 1
result = []
puts "The first #{n} terms of Fibonacci series are:-"
result.push(firstTerm)
while(counter <= n + 1)
if(counter <= 1)
nextTerm = counter
else
result.push(nextTerm)
nextTerm = firstTerm + secondTerm
firstTerm = secondTerm
secondTerm = nextTerm
end
counter += 1
end
# print results
puts result.to_s
end
# create some terms
term1 = 10
term2 = 15
term3 = 50
# get some first nth terms of a Fibonacci series
getFibonacci(term1)
getFibonacci(term2)
getFibonacci(term3)Example to print the first nth term of a Fibonacci Series in Ruby
Explanation
- Line 2: We create a function called
getFibonacci(), which takes thenthterm specified and returns the firstnthterm of a Fibonacci series.
- Line 27–29: We create some terms. That is the
nthnumber of terms of a Fibonacci series. - Line 32–34: We invoke the function on the terms and print the results to the console.
RELATED TAGS
ruby
CONTRIBUTOR
okwudili onyejiaku
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