Vfrdtyky

I want to join two arrays with one array containing index value and a second array containing index position.

string numStrings = new { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};

int nums = new { 2, 32, 70 };

The output I want:

2   Two

32  Three-Two

70  Seven-Zero

I tried below query

var strValuList = (from d in nums

                            from p in numStrings.Select((value, index) => new { value = value, index = index })

                            where p.index == d

                            select new { num = d, p.value}).ToList();

but it returns only

2 Two

Try it yourself first, then you can look at answer:

Hint:

IEnumerable<int> SplitNum(int num)

{

    while (num  > 0)

    {

        yield return num % 10;

        num /= 10;

    }

}

Answer:

string numStrings = new { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" };

int nums = new { 2, 32, 70 };

(Hover mouse on yellow part for the answer [I will remove spoiler part after some time])

string result = nums.Select(n => string.Join("-", SplitNum(n).Reverse().Select(i => numStrings[i]))).ToArray();


DotNetFiddle example

string numStrings = new { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};

int nums = new { 2, 32, 70 };



var dict = new Dictionary<int, string>();



foreach(var n in nums)

{

    var str = string.Join("-", n.ToString().Select(s => numStrings[Convert.ToInt32(s.ToString())]));

    dict[n] = str;

}

I solve it without much complexity. Thanks, @Jeroen Mostert for your advice

string numStrings = new { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" };

int nums = new { 2, 32, 70 };

(from d in nums

select new

{

    num = d,

    parts = d.ToString().Select(o=> Convert.ToInt32(o.ToString())),

    parts2 = d.ToString().Select(o => numStrings[Convert.ToInt32(o.ToString())]),

    parts3 = string.Join("-",d.ToString().Select(o => numStrings[Convert.ToInt32(o.ToString())]).ToArray())

}).Dump();

Output in LinqPad:

This is one of the many ways to do it:

void Main()

{

    string numStrings = new { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" };

    int nums = new { 2, 32, 70 };



    Func<int, string> numToWord = (x) => {

        List<string> words = new List<string>();

        do {

            words.Add( numStrings[x%10] );

            x /= 10;

        } while (x > 0);

        var w = words.Reverse<string>();

        return string.Join("-",w);

    }; 



    var result = nums.Select(n => numToWord(n));



    foreach (var element in result)

    {

        Console.WriteLine(element);

    }

}