Creating an application that determines whether a number is odd/even

Question

I am very new to C# and I am having some issues. I have been trying for a while now and I cant seem to get it right. I think I have the idea but I just don't know how to make it work. There aren't any examples in the chapters of my book either. I need to "create an application that reads an integer, then determines and displays whether it's odd or even. Have the user enter an integer and output to the console: The number you have entered is: input value + even or odd" I'm hoping I can get some help here. Not looking for someone to just do the work either. If you can explain it, please do!

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;

    namespace Student_Challenge_Lab_2
    {
       class Program
   {
      // main method begins the execution of C# program
      static void Main(string[] args)
      {
         int number1; // declares the integer to be added

         // following code prompts user to input the two sets of integers
         Console.Write("Please enter your integer: ");
         number1 = Convert.ToInt32(Console.ReadLine());

         int %(number1, ); 
         // the program now tests to see if the integer is even or odd. If the remainder is        0 it is an even integer
         if (% == 0)
            Console.Write("Your integer is even.", number1);
         else Console.Write("Your integer is odd.", number1);


          }
       } // end main
    } // end Student challenge lab 2

Answer 1

Every binary operator should be used in a form:

[argument1] [THE OPERATOR] [argument2]

The % is also a binary operator, which can be used in the same way as + and / . So analogically, if the / operator produces the result of a division operation:

float result = (float)number1 / number2;

the % will produce the remainder in the same fashion:

int remainder = number1 % number2;

All what's left is that numbers that are even produce 0 remainder when modulo against 2 is calculated.

Answer 2

I'm not sure how you've come up with the syntax you're using here

int %(number1, ); 

You've already defined number1 as an int above. You want to define a new variable that contains the value of your mod operation on number1. So something like:

int remainder = number1 % 2;

Then

if (remainder == 0)

Answer 3

Here, I have done your homework...

The ?? operator is called the null-coalescing operator and is used to define a default value for nullable value types or reference types. It returns the left-hand operand if the operand is not null; otherwise it returns the right operand.

The % operator computes the remainder after dividing its first operand by its second. All numeric types have predefined remainder operators.

I also added a Console.ReadKey so that you can see the output, press any key to end the app.

    using System;

namespace Student_Challenge_Lab_2
{
    internal class Program
    {
        // main method begins the execution of C# program
        private static void Main(string[] args)
        {
            // following code prompts user to input the two sets of integers
            Console.Write("Please enter your integer: ");
            var number1 = Convert.ToInt32(Console.ReadLine());
            // the program now tests to see if the integer is even or odd. If the remainder is        0 it is an even integer
            Console.Write(number1 % 2 == 0 ? "Your integer ({0}) is even." : "Your integer ({0}) is odd.", number1);
            Console.ReadKey();
        }
    }
    // end main
}
// end Student challenge lab 2