CODEWITHSUNDEEP
javanetbeans
Laxy
Laxy

Reputation: 11

Read 10 digits in a Java array and print them out in reverse

I have some problems with an exercise I can do to learn coding with arrays. It's basically my questions title. It's supposed to give me 9,8,7,6,...,0 but it just prints out 0,0,0,0,0,...

Can anyone see what I do wrong here?

public static void main(String[] args) {
    // TODO code application logic here
    int intArray[] = new int[9];
    for (int i = intArray.length -1; i>=0; i--);{
    System.out.println(java.util.Arrays.toString(intArray));
}
}

Upvotes: 0

Views: 223

Answers (2)

Maksym Rudenko
Maksym Rudenko

Reputation: 746

You create array with lenght 9, but you don't set any values in it, so integer instantiated with zeros by default.

You want this:

        int intArray[] = new int[]{1,2,3,4,5,6,7,8,9};

and cycle is wrong as well, reverse print should be like this:

int intArray[] = new int[]{1,2,3,4,5,6,7,8,9};
    for (int i = intArray.length -1; i>=0; i--){
        System.out.println(intArray[i]);
    }

What you did - printed whole array. In my example I print i element of array on every iteration.

And there were extra semicolon after for(...)

UPDATE: there are another ways to get array filled with 10 digits. One more option is another for cycle:

int intArray[] = new int[10];
    for (int i = 0; i < intArray.length; i++) {
        intArray[i] = i;
    }
for (int i = intArray.length -1; i>=0; i--){
        System.out.println(intArray[i]);
    }

Brings the same result, and can be more handy if you have really big array

Upvotes: 1

Rahul Chaube
Rahul Chaube

Reputation: 334

Your code have two error .

  1. You need to set the value of array
  2. Remove the semicolon immediately from for loop ,so your loop run the statement.

Run below code 

 public static void main(String[] args) {

        //need to initalized your array
        int intArray[] = new int[]{1,2,3,4,5,6,7,8,9};
        for (int i = intArray.length -1; i>=0; i--){
            System.out.println(intArray[i]);
        }
    }

Upvotes: 0

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