Solved

Get range given endpoints

Posted on 2006-11-01
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Last Modified: 2012-05-05
Hi EE:

I would like to get a range of alphabets or numbers (integers, whole numbers etc) given endpoints. Say, I provide a string "a,z", I should be able to get back a string a,b,c,d,e,f,...,x,y,z and likewise for numbers. How would be the easiest way to accomplish this?

thx
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Question by:LuckyLucks
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LVL 13

Expert Comment

by:joechina
Comment Utility
have you tried

Convert the input to two ascii number,
Add all chars between those two numbers?

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Author Comment

by:LuckyLucks
Comment Utility
if you can provide the code for that you will get the cake ;)
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LVL 13

Expert Comment

by:joechina
Comment Utility
static string getRange(string input)
 {
            StringBuilder sb = new StringBuilder(30);
            char[] range = input.ToCharArray();
            for (char i = range[0]; i <= range[2]; i++)
            {
                sb.Append(i).Append(',');
            }
            return sb.Remove(sb.Length - 1,1).ToString();
 }

Assume the input is in the format of "x,y"  y > x
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Author Comment

by:LuckyLucks
Comment Utility
I am not sure how this will handle somthing like "0,15". I am expecting the correct answer of "1,14" but I get "1,0". Is there a way to make the last char '15' give 14 and not 0?

thx
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LVL 13

Accepted Solution

by:
joechina earned 500 total points
Comment Utility
static string getRange(string input)
        {
            StringBuilder sb = new StringBuilder();
            string[] s = input.Split(',');
            int start;
            if (int.TryParse(s[0], out start)) //Number
            {
                int end = int.Parse(s[1]);
                for (int n = start; n <= end; n++)
                {
                    sb.Append(n.ToString()).Append(',');
                }
            }
            else //Char
            {
                for (char i = s[0].ToCharArray()[0]; i <= s[1].ToCharArray()[0]; i++)
                {
                    sb.Append(i).Append(',');
                }
            }
            return sb.Remove(sb.Length - 1, 1).ToString();
        }
0
 

Author Comment

by:LuckyLucks
Comment Utility
One minor request, could this be modifed as  "0-15" will return "1-14" (no need for iterating a list as 1,2,3,4,....14). Also, can this be restricted so that the lower bound doesnt go lesser than 0?

many thx
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Author Comment

by:LuckyLucks
Comment Utility
BTW I also get an error saying TryParse doesnt exist for int. Looking that up, it exists for Double
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LVL 13

Expert Comment

by:joechina
Comment Utility
Are you using .net 1.1?

In this case, you can use Parse and capture exception.

To get 1-14 is simple, add 1 to start and minus 1 from end then create your return string.
You can verify the start to make sure it's greater than 0.
change
 for (int n = start; n <= end; n++)
 {
         sb.Append(n.ToString()).Append(',');
 }
to
return (start + 1).ToString() + "-" + (end - 1).ToString;


For character,

return (s[0].ToCharArray()[0] + 1).ToString() + "-" + (s[1].ToCharArray()[0] + 1).ToString();
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