Cannot implicity convert int to int[]

Harshil Pandey

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;
}
}

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sachin Singh5y ago
Accepted 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 Pandey5y ago
Thanks For Your Answers!

Junaid Musla5y ago

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 int[] or change the return type of the method to int.