Nested for-loop in Java giving an error

Question

I'm in a beginner class and my output should look like

This is my loop:

    for (int i = 25; i <= 28; i++){
        for (int a = i; a <= i-10; a -=5);{
            System.out.print(a);
        }
    System.out.println("");
    }

I can't figure out what's wrong with it, but it gives me an error message. Am I doing it right? Nested loops are really difficult for me...

for (int a = i; a <= i-10; a -=5);{ this will never execute. — Jeroen Vannevel
– Jeroen Vannevel, Commented Oct 23, 2013 at 22:10

rgettman · Accepted Answer · 2013-10-23 22:10:33Z

2

Remove the semicolon on this line:

for (int a = i; a <= i-10; a -=5);{

Java thinks that the semicolon is the body of the loop. Then a in the next block is out of scope, giving an error.

Additionally, the condition looks wrong on that for loop. If you start a at i, then it will start out NOT less than or equal to i - 10. Perhaps you meant

a >= i - 10

answered Oct 23, 2013 at 22:10

rgettman

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2 Comments

user2913362 Over a year ago

Thanks -- I don't have the error any more, but I guess the code is wrong because the output is completely blank. I'll try again...

rgettman Over a year ago

@user2913362 I have amended my answer with I believe is wrong with the condition on the a for loop.

libik · Accepted Answer · 2013-10-23 22:10:50Z

0

You have semicolon at the end of for cycle

for (int a = i; a <= i-10; a -=5);

Just remove it and here you go :

for (int a = i; a <= i-10; a -=5)

Also it is not fully functional, this code do output you want :

public static void main(String[] args) {
    for (int i = 25; i <= 28; i++) {
        for (int j = 0; j < 3; j++) {
            System.out.print((i - j*5) +" ");
        }
        System.out.println("");
    }
}

answered Oct 23, 2013 at 22:10

libik

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Comments

Dawood ibn Kareem · Accepted Answer · 2013-10-23 22:10:56Z

0

You need a >= i - 10 in the middle of the second loop, not <=. Also, remove that extra semicolon.

answered Oct 23, 2013 at 22:10

Dawood ibn Kareem

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