Various fancy methods - Iteration 2

Author: raluka

.idea/Numbers.iml

@@ -0,0 +1,94 @@
+=begin
+Write a method which take an integer and return the English version of it.
+=end
+
+def english_number number
+  # No negative numbers. Range is 0 .. 9.999.
+  if number < 0
+    return 'Please enter a number zero or greater.Range is 0 .. 9.999.'
+  end
+  if number > 9999
+    return 'Please enter a lower number. Range is 0 .. 9.999.'
+  end
+  if number == 0
+    return 'zero'
+  end
+
+  num_string = '' # this is the string we will return
+
+  ones_place = ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
+  tens_place = ['ten', 'twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety']
+  teenagers = ['eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen']
+
+  # "left" is how much of the number we still have left to write out.
+  # "write" is the part we are writing now.
+
+  left = number
+  write = left/1000 # how many thousands left?
+  left = left - write*1000 # subtract off those hundreds.
+
+  if write > 0
+    thousands = english_number write
+    if write == 1
+      num_string = num_string + thousands + ' thousand'
+    else
+      num_string = num_string + thousands + ' thousands'
+    end
+    if left > 0
+      num_string = num_string + ' ' # if we have tens, we need a space for them
+    end
+  end
+
+  write = left/100 # how many hundreds left?
+  left = left - write*100 # subtract off those hundreds.
+
+  if write > 0
+    hundreds = english_number write
+    if write == 1
+      num_string = num_string + hundreds + ' hundred'
+    else
+      num_string = num_string + hundreds + ' hundreds'
+    end
+    if left > 0
+      num_string = num_string + ' ' # if we have tens, we need a space for them
+    end
+  end
+
+
+  write = left/10 # how many tens left?
+  left = left - write*10 # subtract off those tens
+
+  if write > 0
+    if write == 1 && left > 0 # special exception for teenagers
+      num_string = num_string + teenagers[left-1]
+      left = 0
+    else
+      num_string = num_string + tens_place[write-1]
+    end
+    if left > 0
+      num_string = num_string + ' '
+    end
+  end
+
+  write = left # how many ones left to write out?
+  left = 0 # subtract off those ones
+
+  if write > 0
+    num_string = num_string + ones_place[write-1]
+  end
+  num_string # we return the string we created
+end
+
+puts english_number (0)
+puts english_number (9)
+puts english_number (10)
+puts english_number (11)
+puts english_number (17)
+puts english_number (32)
+puts english_number (88)
+puts english_number (99)
+puts english_number (100)
+puts english_number (101)
+puts english_number (234)
+puts english_number (3211)
+puts english_number (123123)