[sandvader]

I'm just trying to set up a rectangular array that will take a user inputed number and then output the numbers. Here's my question how do I get the user input into the array?
Here's my code so far

import java.util.*;
import java.text.*;

public class UserInputArray {
  Scanner sc = new Scanner(System.in);// sets program up to accept user input
  public static void main(String args[]) {

	double m[][] = {
	  {1, 2, 3, 4 },// these just put numbers into the array
	  { 0*1, 1*1, 2*1, 3*1 },
	  { 0*2, 1*2, 2*2, 3*2 },
	  { 0*3, 1*3, 2*3, 3*3 }
	};
	int i, j;

	for(i=0; i<4; i++) {
	  for(j=0; j<4; j++)
		System.out.print(m[i][j] + " ");
	  System.out.println();
	}
  }
}

I'm just baflled on what I should use any guidance would be appreciated!

[DaneAU]

I won't give you all the code, however this will get the user input into the array. The second part you asked is how to print the array (hint:: its almost identical to getting values in) - in which you will need to iterate through the array and print out each value... eg. to print the value at [0][1] you would do something like System.out.println(myArray[0][1]);

Anyway here is a snippet

Scanner input = new Scanner(System.in);

int[][] myArray = new int[5][5];

// use a loop and nested loop to fill array
for(int i = 0; i < 5; i++)
{
	for(int k = 0; k < 5; k++)
	{
		System.out.println("Enter a Number :: ");
		myArray[i][k] = input.nextInt();
	}
}

Hope that helped

[Martyr2]

Well you are on the right track. You have declared a scanner object correctly, so now all you need to do is call its nextInt() method which will read the next integer in from the user's input. Below is your code with another loop that prompts for user input...

import java.util.*;
import java.text.*;

public class UserInputArray {
  static Scanner sc = new Scanner(System.in);// sets program up to accept user input
  public static void main(String args[]) {

	double m[][] = {
	  {1, 2, 3, 4 },// these just put numbers into the array
	  { 0*1, 1*1, 2*1, 3*1 },
	  { 0*2, 1*2, 2*2, 3*2 },
	  { 0*3, 1*3, 2*3, 3*3 }
	};
	int i, j;

	for(i=0; i<4; i++) {
	  for(j=0; j<4; j++) {
		System.out.println("Please enter a number: ");
		
		// Notice here we use our scanner to read in another integer from the input (that the user types in)
		m[i][j] = sc.nextInt();
	  }
	}
	
	for(i=0; i<4; i++) {
	  for(j=0; j<4; j++) 
		System.out.print(m[i][j] + " ");
	  System.out.println();
	}
  }
}

Other methods that the scanner has includes nextBoolean, nextFloat and nextDouble (along with many more) that can help read in various types of input. Enjoy!

"At DIC we be input collecting code ninjas... we hold local code ninja meetups where we discuss the issues and collect feedback, have cookies, then try to kill each other!"

[DaneAU]

Quote

"At DIC we be input collecting code ninjas... we hold local code ninja meetups where we discuss the issues and collect feedback, have cookies, then try to kill each other!"

Its true

[sandvader]

bbq, on 8 Aug, 2009 - 08:47 PM, said:

I won't give you all the code, however this will get the user input into the array. The second part you asked is how to print the array (hint:: its almost identical to getting values in) - in which you will need to iterate through the array and print out each value... eg. to print the value at [0][1] you would do something like System.out.println(myArray[0][1]);

Anyway here is a snippet

Scanner input = new Scanner(System.in);

int[][] myArray = new int[5][5];

// use a loop and nested loop to fill array
for(int i = 0; i < 5; i++)
{
	for(int k = 0; k < 5; k++)
	{
		System.out.println("Enter a Number :: ");
		myArray[i][k] = input.nextInt();
	}
}

Hope that helped

It indeed helped very much my ultimate goal on this was to see exactly where the data was being put in. All the samples that I ever found had the data put in manually and I just couldn't understand how it all fell together. Here is my final code I prefilled in a few arrays and then by putting different variables into i & k I can easily see how the arrays get populated

import java.util.*;
import java.text.*;

public class UserInputArray5 {
  static Scanner sc = new Scanner(System.in);// sets program up to accept user input
  public static void main(String args[]) {

	double m[][] = {
	  {8, 8, 8, 8 },// these just put numbers into the array
	  { 7, 7, 7, 7 },
	  { 6, 6, 6, 6 },
	  { 5, 5, 5, 5 }
	};
	int i, j;

	for(i=0; i<1; i++) {// i fills in data by row
	  for(j=0; j<4; j++) {// fill in data by column
		System.out.print("Please enter a number: ");

		// scanner reads in another integer from the input (that the user types in)
		m[i][j] = sc.nextInt();
	  }
	}

	for(i=0; i<4; i++) {
	  for(j=0; j<4; j++)
		System.out.print(m[i][j] + " ");
	  System.out.println();
	}
  }
}

Just a simple little code that really helped me see, thank you again for helping me get there

[DaneAU]

No problems at all matey, glad it helped