Week 1 Exercise 1 - User Input Statistics

gistfile1.txt

#WARNING! This code is functional but has some redundancy
#LEVEL: NIGHTMARE

def is_a_number(input)
  true if Float(input) rescue false
end

def get_input()
  puts "Please give me your input:"
  gets.chomp
end

def count_e(megaString)
  count = 0
  megaString.split("").each do |letter|
    count +=1 if letter=="e"
  end
    count
end

def find_median(numbers)
  size = numbers.count
  #Check if number of inputs is even or odd
  if size % 2 == 0
    #Average 2 middle numbers
    (numbers[size/2]+numbers[size/2-1])/2.0
  else
    #Return middle number
    numbers[numbers.size/2]
  end
end

def find_std_deviation(numbers, average)
  total = 0
  #Calculate variance
  numbers.each do |x|
    total += (x - average) ** 2
  end
  #Calculate and return Standard Deviation
  (1.0/(numbers.count-1) * total) ** 0.5

end
#Initialize variables
input = 0

numbers = []
#Get initial input
input = get_input

#Check if initial input is a number
if is_a_number(input)
  #Add initial input to array
  numbers.push(input.to_f)
  #Adds input to total if a number or sends a message to the user if not
  while(input != "")
    input = get_input
    if is_a_number(input)
      numbers.push(input.to_f)
    else
      #Outputs a message to the user if they enter a non-number
      input != "" ? (puts "You started with numbers! You can't just switch it up like that") : ()
      break
    end
  end
  #Output statistics
  total = numbers.inject(:+)
  average = total / numbers.length
  median = find_median(numbers)
  deviation = find_std_deviation(numbers, average)

  puts "The total for all numbers entered is: #{total}."
  puts "The average of the numbers entered is: #{average}."
  puts "The standard deviation is #{deviation}."
  puts "The median is #{median}"

#If the initial input is not a number
else
  numInputs = 0
  megaString =""
  megaString += input
  total = input.length
  while(input != "")
    input = get_input
    if is_a_number(input)
      puts "Get out of here with those numbers!"
      break
    else
      megaString += input
      total += input.length
      numInputs += 1
    end
  end
  #Calculates average string length and number of 'e's
  average = Float(total) / numInputs
  numberE = count_e(megaString)
  puts "Here is all the text you entered: #{megaString}."
  puts "The average word length is: #{average}."
  puts "Your input contained #{numberE} e's."
end