How to write code for pyramid output in RUBY Language-CodePudding

I'm a new web developer and need assistance generating a given output to a problem:

def fib(n)
    if (n<=2)
        return 1
    else
        return (fib(n-1) fib(n-2))
    end
end

puts "Enter the number of terms:-"
n=gets.chomp.to_i

puts "The first #{n} terms of fibonnaci series are:-"
for c in 1..n
    puts fib(c)
end

OUTPUT:

Enter the number of terms:-
5
The first 5 terms of fibonnaci series are:-
1
1
2
3
5

Excepted output:

How would I be able to make my code produce the target output?

CodePudding user response：

You just need to iterate through the range and calculate fibonacci for every member and you can multuply string with *

def fibonacci(n)
  return n if (0..1).include?(n)
  fibonacci(n - 1)   fibonacci(n - 2)
end

def print_pyramide(n)
  (2..(n   1)).each do |i|
    fib = fibonacci(i)
    puts fib.to_s * fib
  end
end

print_pyramide(2)
# will print
# 1
# 22

print_pyramide(5)
# will print
# 1
# 22
# 333
# 55555
# 88888888

CodePudding user response：

You could use Enumerator::produce, which made it's debut in Ruby v2.7.

Enumerator.produce([1, 1]) { |n1, n2| [n2, n1   n2] }
          .with_index(1)
          .take(5)
          .each { |(_,f),i| puts f.to_s * i }

prints

Note:

enum = Enumerator.produce([1, 1]) { |n1, n2| [n2, n1   n2] }
  #<Enumerator: #<Enumerator::Producer:0x00007fb18084de18>:each>

enum.next #=> [1, 1]
enum.next #=> [1, 2]
enum.next #=> [2, 3]
enum.next #=> [3, 5]
enum.next #=> [5, 8]