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Thread: Conditional Statement Issue *Newbie Help*

  1. #1
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    Default Conditional Statement Issue *Newbie Help*

    I'm trying a basic challenge that involves a program counting to 100, and displaying that output while it counts up.
    • For every multiple of 3; it must print Fizz
    • For every multiple of 5, it must print Buzz
    • For every multiple of 3 & 5 it must print FizzBuzz


    The code I've written handles System.out on the non-multiple numbers, and the FizzBuzz multiples without issue. However, for the multiples of just 3 and 5 it acts as if I didn't write any "else if" condition. I have been unable to figure out what might be causing this! Here is the code.

    class prog{
    	public static void main(String args[]){
     
    	int num = 0;
     
    	while (age < 100){
    	num++;
     
    	if (num % 3 != 0 || num % 5 != 0){
    		System.out.println(num);
    	}
    	else if (num % 3 == 0 && num % 5 != 0){
    		System.out.println("Fizz");
    	}
    	else if (num % 5 == 0 && num % 3 != 0){
    		System.out.println("Buzz");
    	}
    	else if (num % 5 == 0 && num % 3 == 0){
    		System.out.println("FizzBuzz");
    	}
     
    	}
     
     
    	}
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Conditional Statement Issue *Newbie Help*

    Which line(s) are printing in error or not printing as expected?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Conditional Statement Issue *Newbie Help*

    These two blocks

    else if (num % 3 == 0 && num % 5 != 0){
    System.out.println("Fizz");
    }
    else if (num % 5 == 0 && num % 3 != 0){
    System.out.println("Buzz");

    It's as if I never even wrote the code in.

    Ex.
    1,2,3,4,5 .... 13,14,FizzBuzz

    When I'm trying to get 1,2,Fizz,4,Buzz....

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    Default Re: Conditional Statement Issue *Newbie Help*

    Your issue is your first statement. Check your logic:
    1. if num is not a multiple of 3 OR if num is not a multiple of 5
    2. if num is a multiple of 3 AND if num is not a multiple of 5

    Right there is the start of your problem. Your second condition requires num to NOT be a multiple of 5. However, if num is not a multiple of 5, the first if statement's condition is met, so the else statements are never even checked.
    This same logistical problem is in your other conditions.
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    Default Re: Conditional Statement Issue *Newbie Help*

    Here's the error:
    if (num % 3 != 0 || num % 5 != 0) {
                    System.out.println(num);
                }
    It must be
    if (num % 3 != 0 && num % 5 != 0) {
                    System.out.println(num);
                }

    You see, this condition goes before your "Fizz" and "Buzz" conditions. But "Fizz" is executed only if num % 5 != 0. And if this condition is true, than the erroneous block's condition holds (that is, num % 3 != 0 || num % 5 != 0). The same thing is for the "Buzz" block.

  7. #6
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    Default Re: Conditional Statement Issue *Newbie Help*

    With chains of if/else if statements, the first one that is true will be executed. NONE of the others will be tested.
    If the first if statement is true none of the other if statements will be tested.

    Does this post mean that the first if is true for numbers 1 to 14:
    1,2,3,4,5 .... 13,14,FizzBuzz
    Look at the conditions in the first if and see when it will be false. Right now it is true for numbers 1 thru 14
    If you don't understand my answer, don't ignore it, ask a question.

  8. #7
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    Default Re: Conditional Statement Issue *Newbie Help*

    That makes perfect sense. I can't believe I didn't pick up on that at all. Thanks!

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