Java help needed.. badly.

derbys

Hey im stuck on a question that i need to do, i have pretty much the basics of the programme but am not sure how to get it implemented so that it'll work. The question is :

Declare a two dimensional array with 10 rows and 10 columns and initialise:
a) All the elements of its third row to 10
b) All the elements of its 6th column to 20
c) And all the other elements to 5
in that order.

I have the following piece of code that is pretty much the core of the program:

Expand|Select|Wrap|Line Numbers

 
import uwejava.*;

import glos.*;
 
public class exc4 

{
 
 public int nums;
 
 for(int y = 0; y < nums.length; ++y)

  for(int x = 0; x < nums[i].length; ++x)

    if(y == 2)

      nums[y][x] = 10;

    else if(x == 19)

      nums[y][x] = 20;

    else

      nums[y][x] = 5;

  }

So if anyone can figure out how to implemet it to work correctly id be delighted. Two solid days of java has pretty much turned my brain to mush :(

r035198x

Quote:

Originally Posted by derbys

Hey im stuck on a question that i need to do, i have pretty much the basics of the programme but am not sure how to get it implemented so that it'll work. The question is :

Declare a two dimensional array with 10 rows and 10 columns and initialise:
a) All the elements of its third row to 10
b) All the elements of its 6th column to 20
c) And all the other elements to 5
in that order.

I have the following piece of code that is pretty much the core of the program:

Expand|Select|Wrap|Line Numbers

 
import uwejava.*;

import glos.*;
 
public class exc4 

{
 
 public int nums;
 
 for(int y = 0; y < nums.length; ++y)

  for(int x = 0; x < nums[i].length; ++x)

    if(y == 2)

      nums[y][x] = 10;

    else if(x == 19)

      nums[y][x] = 20;

    else

      nums[y][x] = 5;

  }

So if anyone can figure out how to implemet it to work correctly id be delighted. Two solid days of java has pretty much turned my brain to mush :(

Expand|Select|Wrap|Line Numbers

 public class Exc4 {

    public static void main(String[] args) { // every java application has to have this method

        int[][] nums = new int[10][10];//declares a 10 x 10 array of ints

        for(int i = 0; i < nums.length; i++) {

            for(int j = 0; j < nums.length; j++) {

                if(i == 2) {

                    nums[i][j] = 10;

                }

                else if(j == 5) {

                    nums[i][j] = 20;

                }

                else {

                    nums[i][j] = 5;

                }

            }

        }

        for(int i = 0; i < nums.length; i++) {

            for(int j = 0; j < nums.length; j++) {

                System.out.print(""+nums[i][j]);

            }

            System.out.println();

        }

    }

}

derbys

That's brillaint thanks, and opne more question (im a cheeky so and so, i know) I need to

-Create a 50-element integer array
-Fills this array with the random numbers in the range 1 to 10000 and display it.

I *think* i know how i create the integer and random numbers, with the code below - but im not 100% sure on how i should go about displaying it, any help again would be brilliant.

Expand|Select|Wrap|Line Numbers

 
int[] myArray= new int[50]; // Declaring 50 integers
 
for (int i = 0; i < myArray.length; i++) { //Random number

            Double random = new Double(Math.random() * 10000);

            int randomInt = random.intValue();

            myArray[i] = randomInt;
 
        }

I think that's what it is, just need to know what to do to display it

Cheers

r035198x

Quote:

Originally Posted by derbys

That's brillaint thanks, and opne more question (im a cheeky so and so, i know) I need to

-Create a 50-element integer array
-Fills this array with the random numbers in the range 1 to 10000 and display it.

I *think* i know how i create the integer and random numbers, with the code below - but im not 100% sure on how i should go about displaying it, any help again would be brilliant.

Expand|Select|Wrap|Line Numbers

 
int[] myArray= new int[50]; // Declaring 50 integers
 
for (int i = 0; i < myArray.length; i++) { //Random number

            Double random = new Double(Math.random() * 10000);

            int randomInt = random.intValue();

            myArray[i] = randomInt;
 
        }

I think that's what it is, just need to know what to do to display it

Cheers

Expand|Select|Wrap|Line Numbers

 for(int i = 0; i < myArray.length; i++) {

   System.out.print(myArray[i] + " ");// will print all numbers in one line

}

or if you are using jdk 1.5

Expand|Select|Wrap|Line Numbers

 for(int i : myArray) {

   System.out.print(i + " ");

}

Java help needed.. badly.

re: Java help needed.. badly.

re: Java help needed.. badly.

re: Java help needed.. badly.

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