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Thread: multiplication table java 2D array

  1. #1
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    Default multiplication table java 2D array

    Hello fellow Java-Members!

    I am currently trying to solve the following problem, but Iíve been stuck in the last 2-3 days.

    Problem:

    Implement a method
     int[][] getMultiplicationTables(int from, int to)
    , which returns a 2D Array containing the results of the multiplicaton of all numbers for "int from - int to".

    Also, the values of the array should be displayed in columns in the console.


    What Iíve got so far is this:

    public class MultiplicationTables {
     
    	public void printTables(int from, int to) {
    		for(int i = from; i < to; i++) {
    			for(int j = from; j <= 10; j++) {
    				System.out.println(i * j);
    			}
    		}		
    	}
    }

    I just have no idea how to solve this with a 2D Array :/

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: multiplication table java 2D array

    how to solve this with a 2D Array
    First you need to solve the problem manually to get a design.
    Given two numbers, say 2 and 5 what should be the contents of the array?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: multiplication table java 2D array

    int from and int to are indexes? Where does your Array come from? Seems like your method shouldn't only take the indexes, but also the array.
    You could do something like:
    public class MultiplicationTables {
        public void printTables(int from, int to, int [][] yourArray) {
            for(int i = from; i < to; i++) {
    	    for(int j = from; j <= 10; j++) {
    	        System.out.println(yourArray[i][0] *yourArray[0][j]);
    	    }
                System.out.println();
            }		
        }
    }

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