CustomRubyIPGenerator.rb

# Generate 15 random IPs and convert them to Hexadecimal format,
# avoiding Ruby's built in conversion functions
#
# CSCI370 Assignment 1
#
# @author dgalarza (Damian Galarza)


# Create an array to represent hexadecimal numbers
@hexNumbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F']

# A recursive method for converting a decimal number to hexadecimal notation
# 
# @param {Int} Decimal Number
# @return hex representation
def convertHex(d) 
  remainder = d % 16
  difference = d - remainder
  
  ## Check if we're done here
  if difference == 0 then
    result = @hexNumbers[remainder]
  else
      #other wise, get this digit and find the next
      result = convertHex(difference  / 16) + @hexNumbers[remainder]
  end
  
  #Return our result
  result
end

# Loop through and generate 15 random IP numbers, converted to Hex
# when creating and IP address, we will generte each segment separately
for ips in 1..15
  
  #store ips
  decimal_ip = ""
  hex_ip = ""
  
  # Loop 4 times, creating a unique IP segment each time
  for segment in 1..4
    segment_num = 1 + rand(255)
    
    #Store decimal representation of ip segment
    decimal_ip += segment_num.to_s
    
    #add the . seperator if we're not on the last segment
    if segment != 4
      decimal_ip += "."
    end
    
    #Update the hex representation of the ip
    hex_ip += convertHex(segment_num)
  end
  
  #Print out the ip
  puts decimal_ip + ' ' + hex_ip
end