Array Question (using Java)?

Question

In the following code fragment, a is an array of ints with at least one element. Write code that modifies a by switching its first and last elements. For example, when a is the array with elements 2, 4, 6, 8 (in that order), then after executing your code a should be the array with elements 8, 4, 6, 2 (in that order). 

I will test { 1, 2, 3, 2, 1 }


    int[] a = {1, 2, 3, 2, 1  }; 

To do this, I need to figure out what to call the last element. Since this code must apply to any array of any length, so I cannot simply take out the individual elements of the array by using a specific "a[4]" or something like that. 

I can use "a[0]' since it applies to all arrrays--the frist element of all arrays. Can you please help me figure out how to set up this code? 

~much appreciated

AnalProgrammer · Accepted Answer

Think of an array of 3 elements.  Better still draw an array of 3 elements.
That is elements 0, 1, 2.  The first element will always be 0.  The last element is your target.
But you have a variable you can use to help.
myArray.length
In the example above the length will be 3.  How does that help you?  Well the last element is always (length - 1).

Have fun.

Dominic Tuazon · Answer

Hi! :)

First you'll need to set up a loop that handles the switching. 

and Java has a .length you could use to know the total size of the indicated array.

in example: 
a.length would be = 5.

So use all this hints in constructing your program. 
Good luck!

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Array Question (using Java)?

2 Answers