Printing array elements with a for loop

This is the code to answer the question from zyBooks, 6.2.3: Printing array elements with a for loop.

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

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

 System.out.println(""); 

Your two loops almost were correct. Try using this code:

for (int i=0; i < NUM_VALS; i++) {
    // this if statement avoids printing a trailing space at the end.
    if (i > 0) {
        System.out.print(" ");
    }
    System.out.print(courseGrades[i]);
}

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

To print backwards you want:

for(i = NUM_VALS - 1; i >= 0; i--) {
    System.out.print(courseGrades[i] + " ");
}
// To end with a newline
System.out.println("");