Cannot convert lambda expression to type bool

Question

0.00/5 (No votes)

See more:

I am a new learner of c#. I want to find a number is odd or not using delegate anonymous function. I am getting the the above error. Where am i going wrong?

What I have tried:

public delegate bool oddOREvenDelegate(int s);
    class Program
    {
        static void Main(string[] args)
        {
            ///create object for class clsOdd_Even
            ///call the method "CheckisOdd" using the object
            ///display the result
            oddOREvenDelegate t = new oddOREvenDelegate(clsOdd_Even.CheckisOdd);

            Console.WriteLine(t(5));
            Console.Read();


        }
    }


    class clsOdd_Even
    {
        
        public static bool CheckisOdd(int s)
        {
            oddOREvenDelegate t = delegate (int s)
              {
                  if x => x % 2 == 0//cannot convert lambda expression to type bool
                    return false;
              };
        }
        
}
    }

Posted 11-Dec-17 19:59pm

dhivya N

Updated 11-Dec-17 22:31pm

Add a Solution

3 solutions

Solution 1

You do not need to create delegate twice:

public static bool CheckisOdd(int s)
{

	if (s % 2 == 0)
	{
 	     return false;
	}
	else
	{
	      return true;
	}


}

Posted 11-Dec-17 20:23pm

________________

Updated 11-Dec-17 20:24pm

v2

Add a Solution

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

phil.o · Accepted Answer · 2017-12-11T20:41:00

Solution 2

You can also do shorter:

C#

public static bool CheckisOdd(int s)
{
   return ((s % 2) != 0);
}

or quicker:

C#

public static bool CheckisOdd(int s)
{
   return ((s & 1) == 1);
}

Posted 11-Dec-17 20:41pm

phil.o

George Swan · Accepted Answer · 2017-12-11T22:31:00

C#

public static void Main (string[] args)
		{
			//define a delegate that takes an int and returns a bool
			Predicate<int> CheckIsOdd=i=>i%2!=0;
			//call the delegate and write the result
			Console.WriteLine(CheckIsOdd(5));
			//An alternative approach using an anonymous function
			PrintBoolValue (5,i => i % 2 != 0);
		}
		public static void PrintBoolValue(int i,Predicate<int> checkBool)
		{
			Console.WriteLine(checkBool(i));
		}

Cannot convert lambda expression to type bool

3 solutions

Solution 2

Solution 1

Solution 3

Add your solution here

Preview 0

Cannot convert lambda expression to type bool

3 solutions

Solution 2

Solution 1

Solution 3

Add your solution here

Preview 0

Existing Members

...or Join us