String operations in C#

Question

Suppose I have a string "011100011". Now I need to find another string by adding the adjacent digits of this string, like the output string should be "123210122".

How do I split each characters in the string and manipulate them?

The method that I thought was to convert the string to integer using Parsing and splitting each character using modulus or something and performing operations on them.

But can you suggest some simpler methods?

I don't understand your example: 011100011 + 011100011 = 22200022. And your example answer has a 3 in it. By adding adjacent digits, I can only get a maximum of 2 in any position. Please clarify your example, then I will try to answer. — abelenky
– abelenky, Commented Mar 19, 2009 at 7:19
res[0] = 0+1; res[1] = 0+1+1; res[2] = 1+1+1; res[3] = 1+1+0; etc — dahlbyk
– dahlbyk, Commented Mar 19, 2009 at 7:35
@Dahlbyk - your explanation doesn't clarify the original question for me, I'm afraid. What does adjeacnet digits mean - 2 adjacent digits, or 3? - best result that I can come up with is 12210012 - the result will always be one character shorter than the input. — belugabob
– belugabob, Commented Mar 19, 2009 at 8:04
@belugabob: here's how I understood it: every digit in the output string should be the sum of that digit and its two adjacent digits (in the input string). — M4N
– M4N, Commented Mar 19, 2009 at 8:07
@Pragadheesh - I think a little more explanation about the problem domain is due - I suspect that a different data type may be an answer to the problem. — belugabob
– belugabob, Commented Mar 19, 2009 at 8:07

M4N · Accepted Answer · 2009-03-19 07:55:12Z

1

Here's a solution which uses some LINQ plus dahlbyk's idea:

string input = "011100011";

// add a 0 at the start and end to make the loop simpler
input = "0" + input + "0"; 

var integers = (from c in input.ToCharArray() select (int)(c-'0'));
string output = "";
for (int i = 0; i < input.Length-2; i++)
{
    output += integers.Skip(i).Take(3).Sum();
}

// output is now "123210122"

Please note:

the code is not optimized. E.g. you might want to use a StringBuilder in the for loop.
What should happen if you have a '9' in the input string -> this might result in two digits in the output string.

answered Mar 19, 2009 at 7:55

M4N

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belugabob Over a year ago

Or 2 adjacent values which add up to more than 10.

dahlbyk · Accepted Answer · 2009-03-19 07:19:05Z

1

Try converting the string to a character array and then subtract '0' from the char values to retrieve an integer value.

answered Mar 19, 2009 at 7:19

dahlbyk

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Comments

Ian Kemp - SO dead by AI greed · Accepted Answer · 2009-03-19 07:23:04Z

1

string input = "011100011";
int current;

for (int i = 0; i < input.Length; i ++)
{
  current = int.Parse(input[i]);

  // do something with current...
}

answered Mar 19, 2009 at 7:23

Ian Kemp - SO dead by AI greed

1

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