[H3RR3S]

Hello,
When you want to see if a numer is even in C# we use the code:

Code:

( x % 2 == 0)

But why is that? I don't see any logic explanation behind it?

[OversouL]

EDIT: Wrong explanation.

Actually modulo gives you the remainder when you divide. The result of an odd number when halved is 1 and while even numbers are 0.

[darkninja1980]

Is this for making a program in C?

[Spore]

Is this for making a program in C?

C#, its in the title

[darkninja1980]

Is this for making a program in C?

C#, its in the title

What I mean is he can show the whole source code.

[Tracefl0w]

Code:

x % 2

gives the remainder after the integer division (when dealing with only integers such as in this case, otherwise a common type) of x/2. The % is called the modulo operator. Of course when the remainder is 0, the number is even.
Source

[Yotic]

IF x divisible by 2 , The remainder = 0, true

[sunjester]

this is in C

Code:

#include <stdio.h>

int main()
{
    int n = 4;
   
    if(n%2==0)
    {
        printf("n is even");
    } else {
        printf("n is odd");
    }
   
    return 0;
}

random test case

Code:

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i, n;
    time_t t;
    
    srand((unsigned) time(&t));
        
    for(i=0;i<9;i++)
    {
        n = rand()%50;
        
        if(n%2==0)
        {
            printf("%d is even\n", n);
        } else {
            printf("%d is odd\n", n);
        }
   }
    
    return 0;
}

24 is even
20 is even
25 is odd
43 is odd
33 is odd
16 is even
1 is odd
44 is even
7 is odd

[sunjester]

and here is the same modulus operator (%) and using a ternary to replace the if/else. It's a nice way to refactor lines and to get alternating row colors, turning something on and off, or even counting binary bits.

Code:

/// sunjester 2021
/// OddEvenTernary.cs
using System;

namespace OddEvenTernary
{
    class OddEvenTernary
    {       
        static void Main(string[] args)
        {
            String oddEven = String.Empty;

            for(int i=0;i<=10;i++)
            {
                oddEven = (i%2==1 ? "Odd" : "Even");
                Console.WriteLine(i + " is " + oddEven);
            }
        }
    }
}

Code:

c:\software>csc OddEvenTernary.cs && OddEvenTernary.exe
Microsoft (R) Visual C# Compiler version 3.11.0-4.21403.6 (ae1fff34)
Copyright (C) Microsoft Corporation. All rights reserved.

0 is Even
1 is Odd
2 is Even
3 is Odd
4 is Even
5 is Odd
6 is Even
7 is Odd
8 is Even
9 is Odd
10 is Even