how to count numbers under 5.5

Hi all,

Code:

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double numbers[] = {9.8, 5.3, 6.2, 5.5, 5.4, 7.7, 8.1, 3.7, 1.8, 4.6};

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how can I count numbers thats 5.5 or lower?
in the example above it must be 5 numbers under 5.5


Thanks

Quote:

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Originally Posted by pinotje

Hi all,

Code:

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double numbers[] = {9.8, 5.3, 6.2, 5.5, 5.4, 7.7, 8.1, 3.7, 1.8, 4.6};

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how can I count numbers thats 5.5 or lower?
in the example above it must be 5 numbers under 5.5


Thanks

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What do you think the steps should be? Can we see your attempt?

Quote:

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Originally Posted by Fubarable

What do you think the steps should be? Can we see your attempt?

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I really don't know...

I have tried this:

Code:

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if(numbers[i] < 5.5) { count++ }
System.out.println ("counted: " +count);

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Which is certainly wrong...

You need two constructs for this to work. First you have to go through all of the numbers in the array -- what code structure will allow you to loop through each item in the array?

Quote:

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Originally Posted by Fubarable

You need two constructs for this to work. First you have to go through all of the numbers in the array -- what code structure will allow you to loop through each item in the array?

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Do you mean this?:

Code:

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for(int i=0; i<numbers.length; i++)

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Quote:

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Originally Posted by pinotje

Do you mean this?:

Code:

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for(int i=0; i<numbers.length; i++)

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Yes, exactly, a for loop. You've posted the "control" portion of the loop, and the loop will also have a body that will be between curly braces, {}. In the loop body you'll use the if block, and then after the loop you'll print out the results.

Give it a try! :)

Beware when using floating point numbers in equality statements.

Code:

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class DoubleTrouble {
    public static void main(String[] args) {
        int count = 0;
        double[] values = {1, 7.0, 5.4, 5.5, 5.6, 5.499999999999999999999999999999};
        for(double d : values) {
            if(d < 5.5) {
                count++;
            }
        }
        System.out.println(count);
    }
}

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You would expect the output of the above code to be 3 but is in fact only 2.

Quote:

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Originally Posted by Fubarable

Yes, exactly, a for loop. You've posted the "control" portion of the loop, and the loop will also have a body that will be between curly braces, {}. In the loop body you'll use the if block, and then after the loop you'll print out the results.

Give it a try! :)

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Thanks for your tip...

Quote:

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Originally Posted by Junky

Beware when using floating point numbers in equality statements.

Code:

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class DoubleTrouble {
    public static void main(String[] args) {
        int count = 0;
        double[] values = {1, 7.0, 5.4, 5.5, 5.6, 5.499999999999999999999999999999};
        for(double d : values) {
            if(d < 5.5) {
                count++;
            }
        }
        System.out.println(count);
    }
}

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You would expect the output of the above code to be 3 but is in fact only 2.

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Wow Thanks!

This is exactly what I'm looking for!

Can anyone tell me the difference between:

Code:

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double[] numbers = new double[]{1.0, 1.5, 2.0, 2.5, 3.0, 3.5};

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,

Code:

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double[] numbers = {1.0, 1.5, 2.0, 2.5, 3.0, 3.5};

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and

Code:

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double numbers[] = {1.0, 1.5, 2.0, 2.5, 3.0, 3.5};

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I've tried all those 3 codes, and they work the same for me...
Are these codes just the same?

yes all 3 are ways to do the same thing, although the first one is redundant. I personally prefer

Quote:

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double[] numbers = {values};

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