Pfthb

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);