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planning.md

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+# Planning Number Words
+
+Before you start programming, do some planning here on how you will break down
+this problem. Here's a hint: if you start by writing functions for smaller numbers, 
+you will find that these functions help you with the larger numbers. For each of
+the cases below, explain how you would turn a number into a string. Feel free to
+write in sentences or in pseudocode (pseudocode is a sort of "casual programming"
+where you're almost writing in code, being pretty specific without worrying about
+syntax. For each case below, assume the integer is zero or more--don't worry about
+negative integers.
+
+## Integers under 10
+(This one is done for you!)
+For an integer less than ten, you need to know the name of each digit, and look it
+up. You could use a big if/else statement like:
+
+```
+if number == 0:
+    return "zero"
+elif number == 1:
+    return "one"
+elif number == 1:
+    return "two"
+```
+
+A cleaner way to do this would be to make a list of digit names, from zero to nine.
+Then you could just look up a digit's name:
+
+```
+digit_names = [
+    "zero", "one", "two", "three", "four", 
+    "five", "six", "seven", "eight", "nine"
+]
+return digit_names[number]
+```
+
+## Integers under 20
+If the integer is under 10, then use the procedure described above. 
+Otherwise, ... (this is where you take over!)
+
+## Integers under 100
+
+
+## Integers under 1000
+
+
+## Integers under 1000000
+
+
+## Negative integers down to -1 million
+We won't deal with negative integers in this problem set, 
+but how would you deal with a negative integer, using the 
+functions above?
+
+