Question

Getting error: Exited with return code 1. Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 4 out of bounds for length 4 at main.main(main.java:435)

Problem: Write a for loop to print all elements in courseGrades, following each element with a space (including the last). Print forwards, then backwards. End each loop with a newline.

My code:

import java.util.Scanner;

public class CourseGradePrinter {
public static void main (String [] args) {
Scanner scnr = new Scanner(System.in);
final int NUM_VALS = 4;
int [] courseGrades = new int[NUM_VALS];
int i;

for (i = 0; i < courseGrades.length; ++i) {
courseGrades[i] = scnr.nextInt();
}
{
System.out.print(courseGrades[i]+" ");
}
for (i=courseGrades.length-1; i>=0;--i)
{
System.out.print(courseGrades[i]+" ");
}/* Your solution goes here */

}
}

Answer 1

import java.util.Scanner;

public class CourseGradePrinter {
    public static void main(String[] args) {
        Scanner scnr = new Scanner(System.in);
        final int NUM_VALS = 4;
        int[] courseGrades = new int[NUM_VALS];
        int i;

        for (i = 0; i < courseGrades.length; ++i) {
            courseGrades[i] = scnr.nextInt();
        }

        for (i = 0; i < courseGrades.length; ++i) {
            System.out.print(courseGrades[i] + " ");
        }
        System.out.println();

        for (i = courseGrades.length - 1; i >= 0; --i) {
            System.out.print(courseGrades[i] + " ");
        }
        System.out.println();
    }
}