Problem

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

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

While and For Loops

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 final complete code look at the Code area.

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
        }
    }
}