Thread: Easy Help...Printing out the alphabet.

I need to figure out a way to print out the alphabet using a 2d array using char[][] alpha = new char[10][5]; .

It would look like this.

A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E

loops to store ‘A’ in the first row, 'B' in the second row, and so on, using the boundaries of [10][5] meaning 10 is the rows and 5 is the columns.

I am already using a 2d array of char [] [] alphabet = new char[10][5];

Yes, I'm just looking for loops that will do that with the 2D array.

Originally Posted by Norm

I assume that those letters go in the first column on each row. What goes in the other four columns on the row?
If there are 10 rows then the letters will go from "A" to "J".

Yeah that is how I want it. So that it looks like this
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E

Originally Posted by Norm

That is different than you said:
That would be:
A
B
C
D

Rows go down, columns go across.

You can define a 2D array in a statement like this:
String[][] twoD = {{"a"}, {"B","C"}};

I can not define the 2D array using that statement. I need to define it using loops...
This should be the outcome.
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E
A B C D E

Originally Posted by Norm

That is different than you said:
That would be:
A
B
C
D

Rows go down, columns go across.

You can define a 2D array in a statement like this:
String[][] twoD = {{"a"}, {"B","C"}};

For example,

for(int i = 0; i <alpha.length;i++){
for(int j = 0; j<alpha[0].length;j++) {
System.out.print(alpha[i][j] + " ");


}
System.out.println();
}
but this doesn't print out correctly what I need

Originally Posted by Norm

What does it print out? What is wrong with what it prints out?

Prints out the opposite of what I need haha
A A A A A
B B B B B
C C C C C
D D D D D
E E E E E
F F F F F
G G G G G
H H H H H
I I I I I
J J J J J

Originally Posted by Norm

How do the rows go in your array? Are they the first dimension indexed by i?

Try reversing i & j: alpha[j][i]

I've tried reversing them but it just gives me an error when I run it.
java.lang.ArrayIndexOutOfBoundsException: 5
at exam2.main(exam2.java:12)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at edu.rice.cs.drjava.model.compiler.JavacCompiler.ru nCommand(JavacCompiler.java:271)