Find logic behind this code

Question

using System;
public class Program
{
public static void Main(string[] args)
{
int i, j = 1, k;
for (i = 0; i < 5; i++)
{
k = j++ + ++j;
Console.Write(k + " ");
}
}
}

Ans: 4 8 12 16 20

Answer 1

Maninder $ingh
You can define variables without assigning values to them. The values can be assigned later.

int a;
a = 5

int b, c , d;
b= 3, c =a+b
Console.Write(a+b+c);

Answer 2

it's looping 5 times (counting the i from 0 to 4) and then j is incremented in a postfix manner which means use the current value of j then add 1 to j...then the next increment is a prefix which means add 1 to the value of j then use j...so that would be:
1 + 3 = 4
3 + 5 = 8
5 + 7 = 12
7 + 9 = 16
9 + 11 = 20

Answer 3

Am noob in c#.
Does in this line

int i,j=1,k;
Here i==1 and j==k but where he define k in programme am totally confuse.

Answer 4

~ swim ~ i know i have done half c# course but sometimes i confuse what people write python is so easy.

Answer 5

~ swim ~ can you tell me answer my question.

Answer 6

~ swim ~ i know all concepts which i have completed in my half c# course confusion is here what is meaning of line 6 which i never seen in course.where he define k variable.

Answer 7

~ swim ~ i know everything which you are mentioning in your answer.
Am ask you he wrote a line
int i,j=1,k
Here the value of i is 1 and value of j is k here j is int means k should also be int but k is not defined in his programme am totally confuse.