Cannot implicity convert int to int[]

Question

Hey, i am new to this forum(first question here). So Here my problem is that i have this code and the last return statement it says "cannot implicitly convert int to int[]". Earlier i did a few tweaks to code but no luck can't find the solution! Now here's the code using System; public class Program { public static void Main() { Console.WriteLine(FindDuplicates([1,2,2,3])); } public int [] FindDuplicates( int [] nums) { var tortoise = nums[0]; var hare = nums[0]; while ( true ) { tortoise = nums[tortoise]; hare = nums[nums[hare]]; if (tortoise == hare) break ; } var ptr1 = nums[0]; var ptr2 = nums[tortoise]; while (ptr1 != ptr2) { ptr1 = nums[ptr1]; ptr2 = nums[ptr2]; } return ptr1; } }

Sachin Singh · Answer

c# is a rich language , keep things simple second you are returning Int[] but using console.write() , how is this possible? Console.WriteLine() can only print a line and not multiple lines untill you use it inside foreach block . third when your return type is array of integer but you have returned a single integer , so the conversion failed and this is where you are getting error. public class Program { public static void Main() { var duplicates= FindDuplicates(1,2,3,4,4,5,6,6); foreach (var duplicate in duplicates) { Console.WriteLine(duplicate); } Console.ReadLine(); } public static List int > FindDuplicates( params int [] nums) { return (nums.ToList().GroupBy(x => x) .Where(g => g.Count() > 1) .Select(y => y.Key)) .ToList(); } } Note :- I have used params so that user can enter comma separated value directly instead of array. second when linq is there then ustilize it .

Harshil Pandey · Answer

Thanks For Your Answers!

Junaid Musla · Answer

Its a basic compile time error in your code. The return type of the method FindDuplicates is int[] i.e, array of integer. While at the end you are returning an integer value rather than array of integer. Solution: either return i nt[] or change the return type of the method to int .