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

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    Exclamation 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


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    Default Re: Easy Help...Printing out the alphabet.

    Can you explain why you need an array to print out what you have posted?
    A simple loop like this will print it:
    for (int i=0; i < 10; i++)
    System.out.println("A B C D E");

    You can define a 2D array like this:
    String[][] twoD = {{"a"}, {"B","C"}};
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Easy Help...Printing out the alphabet.

    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];

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    Default Re: Easy Help...Printing out the alphabet.

    store ‘A’ in the first row, 'B' in the second row
    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".
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Easy Help...Printing out the alphabet.

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

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    Default Re: Easy Help...Printing out the alphabet.

    Quote Originally Posted by Norm View Post
    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

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    Default Re: Easy Help...Printing out the alphabet.

    That is different than you said:
    'A’ in the first row, 'B' in the second row
    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"}};
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Easy Help...Printing out the alphabet.

    Quote Originally Posted by Norm View Post
    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

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    Default Re: Easy Help...Printing out the alphabet.

    Quote Originally Posted by Norm View Post
    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

  10. #10
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    Default Re: Easy Help...Printing out the alphabet.

    What does it print out? What is wrong with what it prints out?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Easy Help...Printing out the alphabet.

    Quote Originally Posted by Norm View Post
    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

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    Default Re: Easy Help...Printing out the alphabet.

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

    Try reversing i & j: alpha[j][i]
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Easy Help...Printing out the alphabet.

    Quote Originally Posted by Norm View Post
    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)

  14. #14
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    Default Re: Easy Help...Printing out the alphabet.

    Your code is printing out the columns of each row in the array row by row. You need to change the contents of the array is you want to see something different.
    Your array has As in all columns of the first row, Bs in all col of second row etc
    If you don't understand my answer, don't ignore it, ask a question.

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