Could someone help me with a 'for' loop/array java problem?

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I'm learning for loops and arrays. I'm supposed to program a small problem but not sure how to approach it at all. Here it is.

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What I have tried:

I've tried this but I'm not sure it's correct.

   		if (var1 == var2 || var1 == var3 || var1 == var4 || var1 == var5 ) {
   			
   			System.out.println("You entered an existing number.");
   			int revar1 = sc.nextInt();

}

Posted 17-Nov-20 9:49am

Derek Jameson

Updated 17-Nov-20 21:28pm

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The Other John Ingram 17-Nov-20 16:33pm

reread the problem
there is supposed to be loops and arrays in the program
you have none

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OriginalGriff · Answer 1 · 2020-11-17T10:41:00

No, I'd say it's wrong.
The question asks you to "input 5 numbers" and "ignore any that have been entered before".
What if I enter 1, 2, 2? You should be ignoring them as they are entered, and checking against the "current list" of values.

To do that, create an array of 5 integers, and an index which starts at zero.
Now use a loop which continues until you index equals 5 - the number of integers you are required to collect.
Inside the loop, get the user to input a number.
Use a for loop to check it against the ones he entered before (they are in the array, with values less than the index you created). If the value is there already, ignore it.
Otherwise, insert it to the array, and increment the index.

Try it manually, and you'll see what I mean - it's the same process you would use to do it on paper.

If you can't get started, have a look at this: How to Write Code to Solve a Problem, A Beginner's Guide[^] - it should give you a technique for working things out a bit better.

Richard MacCutchan · Answer 2 · 2020-11-17T21:28:00

Solution 2

See The Java™ Tutorials[^]

Posted 17-Nov-20 21:28pm

Richard MacCutchan