Help on if statement

Question about the task

Under discussion

I've tried a few ways now, but it seems whatever I put inside the if statement, doesn't get recognised when I try to run it. it either says symbol not found or 'n may not have been initialized '. Any advice please?

You need to write a program that:

Reads an integer N from the console.
If the number N is greater than 0, then the program reads an additional N integers.
Print the numbers to the console. If N is odd, display them in the order in which there were entered. Otherwise, display them in reverse order.

Display each number on a new line. Do not display the number N.

Requirements:

The program should read a number N, followed by N numbers.
The class must have a public static void main (String[]) method.
Do not add new methods to the Solution class.
If N is even, then the program should display N numbers in reverse order.
If N is odd, then the program should display N numbers in the order in which they were entered.

package en.codegym.task.pro.task05.task0505; import java.util.Scanner; /* Reverse */ public class Solution { public static void main(String[] args) { //write your code here Scanner sc = new Scanner(System.in); int N = sc.nextInt(); int n; if(N>0){ n = N+1; } int[] array = new int[n]; array[0] = N; for(int x = 1; x<=n; x++){ array[x] = sc.nextInt(); } if((N%2)==0){ for(int i = (n-1); i>=0; i++){ System.out.println(array[i]); } }else{ for(int e = 0; e<n; e++){ System.out.println(array[e]); } } } }

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Jack Winning

Level 6 , Nottingham, United Kingdom

28 February 2024, 12:35

Thanks for the reply. Not sure I'm following though sorry. I'll have another play around with it. My rationale for N+1 was - the requirement is that if N>0, read another N numbers. So if N = 5 for example, I need to read an additional 5 numbers. So the number of cells in the array in total would be 6 (i.e N+1).

Guadalupe Gagnon

Level 37 , Tampa, United States

28 February 2024, 14:18

N is for how many numbers the algorithm will be working with and should not be included in the final output. Therefore if N is equal to 5 then you need to initialize an array of 5 and fill it with the 5 additional numbers for the rest of the algorithm.

Thomas

Level 41 , Bayreuth, Germany

28 February 2024, 06:53

if N is smaller or equal to zero than you try to create in line an array using the not initialized variable n. n only will be initialized if N > 0. Why N + 1? Your supposed do read a n numbers from the keyboard and codegym asks you to read that n beforehand (again from the keyboard).

int n = sc.nextInt();
if (n > 0) {
    for (int i = 0; i < n; i++) {
         // some code
    }