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Thread: Continue and break statements

  1. #1
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    Default Continue and break statements

    Code then description of problem:

    class Weather 
    {
    	public static void main(String[] args) 
    	{
    	// declare variables
    	int i = 1; // represents year
    	double temp = 0.0;
    	final double ANNUAL_INCREASE = 1.0;
    	double uncertainty = 0.0;
    	String result = " ";
    	System.out.println(" Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
     
    	while(true)
    	{
    	if (i > 5) break;
    	else if (i == 3) continue;
    	System.out.println(i);
    	i++;
    	}
     
    	}
    }

    So part of my assignment is to loop though my variable for year (named i) from 1 through 5. Then skip through once "i" has the value of 3, and continue on afterwards. The code above compiles and displays this output:

     Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    1
    2

    It stops and leaves 3 as an empty blinking line inside of my terminal. Switching the break and continue statements around like this:

    while(true)
    	{
    	if (i == 3) continue;
    	else if (i > 5) break;
    	System.out.println(i);
    	i++;
    	}

    gives me the same result as the first code. It was my understanding that the break statement is essentially a loops stopping point, and continue carries on to the next iteration without terminating the loop.


    This code below gives me the nearly desired result:

    while(true)
    	{
    	if (i > 5) break;
    	System.out.println(i);
    	i++;
    	}

    It prints out like this:

    1
    2
    3
    4
    5

    So that makes me know that the stopping point is at least correct. The confusion comes when trying to skip over once (i == 3).
    The only time i was instructed to use the continue statement was inside of a for loop like this:

    for (int i = 0 ; i <= 5 ; i++)
    {
    	if (i == 3) continue;
    	System.out.println("I = " + i);
    }

    Which gives me the perfect output (1, 2, 4, 5). I'm hoping this is just a syntax thing rather than a misunderstanding on my end for combining a continue/break statement.

    Any help towards the solution is appreciated


  2. #2
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    Default Re: Continue and break statements

    One wonders why you just didn't program it as:
    while( i < 6 )
    {
    	if (i != 3)
    	{
    		System.out.println(i);
    	}
    	i++;
    }

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    Default Re: Continue and break statements

    "Using a while(true) statement, loop over Year i from 1 through 5, EXCEPT i = 3. Use a break statement to exit the loop as appropriate. When i = 3, it should skip the calculations and go the next iteration, so use a continue statement for that."

    I agree, my courses are online and it' s more difficult to follow along i guess, but that's how i was instructed to do it, points get deducted if i don't do the assignment "as written"

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    Default Re: Continue and break statements

    Okay, the requirement wasn't clear.

    In either of your original while( true ) loops, when will the index, i, be incremented?

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    Default Re: Continue and break statements

    Well, after the println, it's what worked in the final while(true) loop. I tried rearranging everything in the loop like this:

    while(true)
    	{
    	System.out.println(i);
    	if (i > 5) break;
    	else if (i == 3) continue;
    	i++;
    	}

    That sends the code into an infinite loop at 3, which isn't ideal especially that what's being printed is the number 3 (the one number i don't want haha). Lastly, in my notes for the continue statement,it seems the continue statement simply skips over to the next part of the code like this:

    for (int i = 0 ; i < = 5 ; i++)
    {
    	if (i == 3) continue;
    	System.out.println("I = " + i);
    }

    "When i == 3, continue on to the next part"

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    Default Re: Continue and break statements

    I think that means you haven't figured it out. The path to a solution is understanding or finding the answer to the question I asked. You seem to have figured it out, at least you have experienced what happens if the continue; statement occurs BEFORE the i++: an infinite while( true ) loop occurs. So, what must you do to ensure the while ( true ) loop doesn't become inescapable when i == 3? There are a number of possible solutions, but they may all be different versions that reorder the statements you have.

    And the if/else construct isn't necessary. I think it's clearer without the if/else, but that may just be me.

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    Default Re: Continue and break statements

    OK, I'll give understanding your post a solid effort before i report back. Just scratching my head how a while(true) statement would be formatted without the if-else statements. I am still quite new, so i over think just about everything.

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    Default Re: Continue and break statements

    OK, i'm really close i think. I got the code to compile and display the desired output, only problem is that in the assignment it requires me to declare a variable of type int, name it i and set it with a value of 1. The only way i could get it to compile and display what i wanted was to set the value of i to 0.

    class Weather 
    {
    	public static void main(String[] args) 
    	{
    	// declare variables
    	int i = 0; // represents year
    	double temp = 0.0;
    	final double ANNUAL_INCREASE = 1.0;
    	double uncertainty = 0.0;
    	String result = " ";
    	System.out.println(" Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
     
    	while(true)
    	{
    	if (i >= 5) break;
    	i++;
    	if (i == 3) continue;
    	System.out.println(i);
    	}
     
    	}
    }

    This code does exactly what i want, but is not written in a way that i was instructed. When i set the value to 1 (as instructed) it prints out 2, 4 and 5. Even if i put the print statement before the if statements it prints 2, and that doesn't make sense since i shouldn't = 2 until after it loops once.

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    Default Re: Continue and break statements

    Are you interpreting the instructions in post #3 as requiring i to be initialized to 1, or do you have other instructions that specifically say i must be initialized to 1? If the former, I don't agree with your interpretation. If the latter, I'll have to think on it some more in the morning.

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    Default Re: Continue and break statements

    Yes, prior instructions stated that i be initialized to 1. I'm just leaving it for the moment, the whole rest of the assignment is a freaking mess as well.

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    Default Re: Continue and break statements

    Then it seems the only way to satisfy all of the requirements you've been given is to add an i++ statement to be executed before the continue statement, like:
    if (i == 3)
    {
    	i++;
    	continue;
    }
    Then you can move the i++ in the while loop to after the print statement so that i can be initialized to 1 for the first pass through the while loop.

  12. The Following User Says Thank You to GregBrannon For This Useful Post:

    ///M Dood (September 22nd, 2013)

  13. #12
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    Default Re: Continue and break statements

    Here's what i got to work:


    public class Test 
    {
    	public static void main(String[] args) {
    	int i = 1;
     
    	while(true)
    	{
    	if (i > 5) break;
            if (i == 3)
            {
                   i++;
                  continue;
             }
    	System.out.println(i);
    	i++;
    	}
     
     
    	 }
    }

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