CODEWITHSUNDEEP
c#
Sandrious
Sandrious

Reputation: 138

How to split string number into separate integers

I'm new in C# and programming at all, and I face the following problem.

How to split a given number, which I recieve as a string, to array of integers in console application?

For example: My input is 41234 and I want to turn it to array of "4", "1", "2", "3" and "4".

I've tried to use standard

Console.ReadLine().Split().Select(int.Parse).ToArray();

But it sets the whole number as content of the first index of the array, does not splits it.

I've also tried to use char[] array, but in some cases it returns the ASCII value of the char, not the value it represents.

Upvotes: 1

Views: 2417

Answers (5)

Hamit YILDIRIM
Hamit YILDIRIM

Reputation: 4539

There is much solution in C# for this

int[] values = "41234".ToArray().Select(c=> (int)char.GetNumericValue(c)).ToArray();

Upvotes: 0

jimit patel
jimit patel

Reputation: 46

This Code snapshot will replace all character except numeric to blank and gives you only int array.

string a = "1344te12we3ta";
Regex rgx = new Regex("\\D+");
string result = rgx.Replace(a, "");
int[] intA = Array.ConvertAll(result.ToCharArray(), c => (int)Char.GetNumericValue(c));

Upvotes: 0

Rufus L
Rufus L

Reputation: 37020

If you want to return each character as an integer, you can just treat the string as an IEnumerable<char> (which it is) and you can use a couple of static methods on the char class:

  1. char.IsNumber will return true if the character is a number
  2. char.GetNumericValue will return the numeric value of the character (or -1 for non-numeric characters)

For example:

int[] numbers = "123456_ABC"
    .Where(char.IsNumber)  // This is optional if you know they're all numbers
    .Select(c => (int) char.GetNumericValue(c))  // cast here since this returns a double
    .ToArray();

Alternatively, since we know non-numeric characters get a -1 value from GetNumericValue, we can do:

int[] numbers = "123456_ABC"
    .Select(c => (int) char.GetNumericValue(c))  // cast here since this returns a double
    .Where(value => value != -1)  // This is optional if you know they're all numbers
    .ToArray();

In both cases above, numbers becomes: {1, 2, 3, 4, 5, 6}

Upvotes: 5

Panagiotis Kanavos
Panagiotis Kanavos

Reputation: 131180

String.Split uses whitespace characters as the default separators. This means that String.Split() will split along spaces and newlines. It won't return individual characters.

This expression :

var ints = "1\n2 345".Split();

Will return :

1 2 345

A string is an IEnumerable<char> which means you can process individual characters. A Char is essentially an Int32 and digits are ordered. This means you can get their values by subtracting the value of 0:

var ints = "12345".Select(c=>c-'0').ToArray();

Or even :

var sum="12345".Select(c=>c-'0').Sum();
Debug.Assert(sum==15);

Upvotes: 2

Marc Gravell
Marc Gravell

Reputation: 1062492

but in some cases it returns the ASCII value of the char, not the value it represents.

It always does that (a string is a sequence of char), but if you're only dealing with integers via characters in the range '0'-'9', you can fix that via subtraction:

int[] values = s.Select(c => (int)(c - '0')).ToArray();

Upvotes: 4

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