Check array value inside for loop

Question

I have to check second value in array if is equal to zero. It's working on my first example, where is user input not looped. But is not working on second example, where user input is looped.

First example

int[] array = new int[4];

array[0] = int.Parse(Console.ReadLine());
array[1] = int.Parse(Console.ReadLine());

//This statement Works here

if (array[1] == 0)
{
    Console.WriteLine("Alert!");
}
array[2] = int.Parse(Console.ReadLine());
array[3] = int.Parse(Console.ReadLine());

Second example

int[] array = new int[4];

for (int i = 0; i < array.Length; i = i + 1)
{ 
    //Input
    array[i] = int.Parse(Console.ReadLine());

//This statement is not working

if (array[1] == 0)
{
   Console.WriteLine("Alert!");
}

Can you print array[1] in the second case and see what's in it? — Zoran Horvat
– Zoran Horvat, Commented Dec 11, 2016 at 12:44
It works perfect (after i add the miss } ), What the problem? — Stack Overflow
– Stack Overflow, Commented Dec 11, 2016 at 12:49
I have missing } in my code, I just skipped it when I was copying this code. And its still not working. — Slasher
– Slasher, Commented Dec 11, 2016 at 12:53

Alexander · Accepted Answer · 2016-12-11 13:14:13Z

1

I think you maybe want to do that:

int[] array = new int[4];

for (int i = 0; i < array.Length; i = i + 1)
{ 
    //Input
    array[i] = int.Parse(Console.ReadLine());
    if (array[i] == 0) // use i instead of 1
    {
        Console.WriteLine("Alert!");
    }
 }

answered Dec 11, 2016 at 13:14

Alexander

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1 Comment

Slasher Over a year ago

If you use [i], then is meant for all array fields, but I strictly needed only for specific value.

Slasher · Accepted Answer · 2016-12-11 13:09:24Z

0

I just had to write this if statement outside the loop. Now it Works

int[] array = new int[4];

for (int i = 0; i < array.Length; i = i + 1)
{ 
    //Input
    array[i] = int.Parse(Console.ReadLine());
}

if (array[1] == 0)
{
   Console.WriteLine("Alert!");
}

answered Dec 11, 2016 at 13:09

Slasher

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Comments

user3598756 · Accepted Answer · 2016-12-11 18:33:15Z

0

to be sure to acuire valid values rom user you could use int.TryParse() instead of int.Parse()

        for (int i = 0; i < array.Length; i = i + 1)
        {
            while (!int.TryParse(Console.ReadLine(), out array[i]))
                Console.WriteLine("Input an integer value!");                    
        }

        if (array[1] == 0)
        {
            Console.WriteLine("Alert!");
        }

answered Dec 11, 2016 at 18:33

user3598756

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Check array value inside for loop

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Second example

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I just had to write this if statement outside the loop. Now it Works

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Collectives™ on Stack Overflow

First example

Second example

3 Answers 3

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I just had to write this if statement outside the loop. Now it Works

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