Problem

Print out the entire lower case letters of the alphabet. Use the following guidelines when coming up with a solution:

• char for printing out each of the lowercase letter's in the alphabet.
• Output using System.out.println
• Comment as you code.
• To get the next letter in sequence use the increment operator.

By Students...

Comments are very important in documenting how your program works. They make it easier for the marker to understand and grade your work and it also makes it easier for someone else to understand it. Commenting as you code is a very important skill that you should acquire.

I usually don't comment as I code but I have been trying to change that. For small first year assignments not commenting as you code is okay because it is easy to add afterwords. But when you are working on later assignments and you end up having 600+ lines of code it gets quite a bit harder to add them at the end. I remember having to spend a couple of hours after I finished coding an assignment in order to add in all of my comments; I found that very stressful and not enjoyable. It is easier and more enjoyable to document code as you write it.

Solution

When printing out the alphabet you are going to need to know the number of letters to stop the for loop at the right time.

//final indicates that this is a constant
//Uppercase also indicates that this is a constant
final int NUMLETTERS = 26;

Using this constant we can build our for loop.

//our for loop will run from 0 to NUMLETTERS - 1
for(int i = 0; i < NUMLETTERS; i++)
{
    //code to be added here later
}

For printing out the letters you are going to need a char variable.

//the initial value of letter will be a since we are printing out the lower case alphabet.
char letter = 'a';

Char's and Int's can be manipulated in the same way. For example to get a number + 1, we can just do number++.

//our number variable
int number = 0;
//we are incrementing our number which is exactly the same as number = number + 1
number++;

System.out.println("number = " + number);

Output:
number = 1

We can do exactly the same thing with char's.

char letter = 'a';
//get the next letter in the alphabet
letter++;

System.out.println("letter = " + letter)

Output:
letter = 'b'

Putting all of this code together we can get our final for loop which will print out the alphabet.

for(int i = 0; i < NUMLETTERS; i++)
{
    //print out the current letter
    System.out.println(letter);
    //increase the letter to get the next
    letter++;
}

For the complete final code you can look under the code heading.

Code

Solution Code

public class PrintOutTheAlphabet
{
    public static void main(String [ ] args)
    {
        //final indicates that this is a constant
        //Uppercase also indicates that this is a constant
        final int NUMLETTERS = 26;
        //the initial value of letter will be a since we are printing out the lower case alphabet.
        char letter = 'a';
        
        //our for loop will run from 0 to NUMLETTERS - 1
        for(int i = 0; i < NUMLETTERS; i++)
        {
            //print out the current letter
            System.out.println(letter);
            //increase the letter to get the next
        }
    }
}