Question

I am trying to understand nested loops by getting this program to work. I’d like to use the “each do” way of looping, if possible. Right now the loop executes all of the 1st loop, then 2nd…etc…I’d like to do, execute 1st loop 1 time, then fall down to 2nd loop one time…etc. Here is my code (pasted below)

Desired output would be something like this:

index                       3.0                  3.0
+-------------------------------------------------------+
0                          -23.4                -23.4
1                       -2226.74             -2226.74
2                   -1.93464e+07         -1.93464e+07

Code

class LogisticsFunction
  puts "Enter two numbers, both between 0 and 1 (example: .25 .55)."
  puts "After entering the two numbers tell us how many times you"
  puts "want the program to iterate the values (example: 1)."

  puts "Please enter the first number: "
  num1 = gets.chomp

  puts "Enter your second number: "
  num2 = gets.chomp

  puts "Enter the number of times you want the program to iterate: "
  iter = gets.chomp

  print "index".rjust(1)
  print num1.rjust(20)
  puts num2.rjust(30)
  puts "+-------------------------------------------------------+"

  (1..iter.to_i).each do |i|
    print i
  end
    (1..iter.to_i).each do |i|
      num1 = (3.9) * num1.to_f * (1-num1.to_f)
        print num1
    end
      (1..iter.to_i).each do |i|
        num2 = (3.9) * num2.to_f * (1-num2.to_f)
          print num2
      end
end

Answer 1

I think you don’t have to run with three loop, following will give the desire output

(1..iter.to_i).each do |i|
  print i
  num1 = (3.9) * num1.to_f * (1-num1.to_f)
  print num1.to_s.rjust(20)
  num2 = (3.9) * num2.to_f * (1-num2.to_f)
  print num2.to_s.rjust(30)
end