Write a program to take N numbers as input and output all even numbers from 1 to N inclusive, each on a new line.

Question

Write a program to take N numbers as input and output all even numbers from 1 to N inclusive, each on a new line.

Sample Input
9

Sample Output
2
4
6
8

My Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int num = Convert.ToInt32(Console.ReadLine());
int res = 1;
//your code goes here
while (num > res){Console.WriteLine(res); res++;
if (res % 2 == 0) continue;}
}
}
}

Please someone help me with this.

Answer 1

https://code.sololearn.com/c3wbruv24gZM/?ref=app

Answer 2

If you start from 2 instead of 1, you can escape the need of using modulo operator to check for even numbers. You can simply increment <res> by 2 on each loop round to get to the next even number.

Answer 3

while (num >= res) {
if (res % 2 == 0) Console.WriteLine(res);
res++;
}

Answer 4

I've managed to kinda solve the problem with this task
I tried this and it "Solved" the challenge

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

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int num = Convert.ToInt32(Console.ReadLine());
int res = 2;
//your code goes here
while(res <= num)
{
Console.WriteLine(res);
res+=2;
}
}
}
}

Tell me what you think about my answer!

Answer 5

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

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int num = Convert.ToInt32(Console.ReadLine());
int res = 1;

//your code goes here
int evennum = 2;
while (num > res)
{
if (num%2 == 0)
{
Console.WriteLine(evennum);
evennum+=2;
}

num--;
}

}
}
}

Answer 6

I understand all of this except from the «num—« part. Why does it have to be there? And what does it mean?

Answer 7

Take a look at my first code and see the problem.

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

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int num = Convert.ToInt32(Console.ReadLine());
int res = 1;

//your code goes here
while (num > res)
{
if (num%2 == 0)
{
Console.WriteLine(num);
}
num--;
}

}
}
}

Answer 8

I hope that I am able to explain it in english 😅

Num— counting down the given number by 1.
Take a look at lesson 10.1 Basic Concepts.
For example:

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

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int num = Convert.ToInt32(Console.ReadLine());
int res = 1;

//your code goes here

while (num > res)
{

Console.WriteLine(num);

num--;
}

}
}
}

Whats the condition for the while loop ? Right num is bigger than res.
So the loop will run as long this condition is true.
The question now is:
How we are able to stop the loop and only give out all even numbers?

Answer 9

To stop the loop we need to decrease the given number, everytime the loop is executing.
For this I took num—.
And then we only need to filter the even numbers:

if (num%2 == 0)
{
Console.WriteLine(evennum);
evennum+=2;
}

You wrote that you understand that part so no more explanation. 😅
Why I used a third variable? It solved my problem of counting down instead of counting up.
Compare my codes.
Kind regards.

Answer 10

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

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int num = Convert.ToInt32(Console.ReadLine());
int res = 1;
//your code goes here
while (res < num)
{
if (res % 2 == 0)
{
Console.WriteLine(res);
}
res ++;
}

}
}
}

Answer 11

i=int(input('Enter a number:'))
even=list(filter(lambda x:x%2==0,list(range(1,i))))

for even in even:
print()
print(even)