How do I get my if loop to stop ignoring the position 1?

October 3, 2023

Im trying to create an if loop that writes out the numbers at odd (non-even) positions in an array, which it does on every position except 1. I assume this is because the modulus rounds down the 0.5 to 0. I have resorted to just writing it out but am thinking that there must be a better way.

int[] num = new int[10];
Random rand = new Random();
for (int i = 0; i < num.Length; i++)
{
    num[i] = rand.Next(1, 50);
}
for (int i=0; i < num.Length;i++)
{
    Console.Write(" " + num[i] + " ");
}
for (int i = 0; i < num.Length; ++i)
{
    if (i%2 != 0)
    {
        Console.WriteLine(" " + num[i]);
    }
}

I tried having the modulus operation as a seperate double to see if that would make it register the 0.5 but it didn’t make a difference. I also added a specific "OR" variable in the if loop for i = 1 but for some reason that didn’t work either.

This is the result I get from the code above:

>Solution :

The problem you are facing is that the loop, which shows only the odd numbers, starts at the end of the first line.

If you count the numbers on the first line.. you count 11 (instead of 10).

That’s because the Console.Write stays on the same line for the next write. You need to insert a CR there.

int[] num = new int[10];
Random rand = new Random();
for (int i = 0; i < num.Length; i++)
{
    num[i] = rand.Next(1, 50);
}
for (int i=0; i < num.Length;i++)
{
    Console.Write(" " + num[i] + " ");
}

// insert a linebreak here. So the next output starts
// on a new line.
Console.WriteLine();

for (int i = 0; i < num.Length; ++i)
{
    if (i%2 != 0)
    {
        Console.WriteLine(" " + num[i]);
    }
}