Reading numbers

[edprog]

Hello,

How can I read from the points x and y? but first providing the number of points so for example

3
3 4
2 1
2 3

where 3 is the number of points and the left column is the x's and right the y's I can do it using the Scanner x= new Scanner(System.in) but i can only read this way

3
X:3
Y:4
X:2
Y:1
X:2
Y:3

How can i get make it so that it can be read as mentioned at the beggining, I ppareaciate your help

Regards

[Junky]

Make a single read to get how many x y pairs there are. Then use a loop to read the rest. you can read the entire line and then split and parse the values. Or for each loop iteration read 2 values.

[edprog]

I am sorry i am kind of a newb, would you be able to show me maybe like a pseudo code...?, because everytime when i use Scanner, it prompts on the next line... and i would like to do it something like

2
1 2
2 5

I am sorry

[sunde887]

Ask for number of points to read 
Loop
  Read x
  Read y
End loop

I don't know what you are wanting to do with the data so I can't offer much more advice. A for loop is always a good choice for looping x times.

[edprog]

Hello,

I do not have a problem reading x and y, i have a problem not being able to read it in the following format

3 4 (where 3 is x and 4 is y)
2 1 (where 2 is x and 1 is y)

instead of

3
4
2
1

Any ideas?

[Junky]

The pseudocode provided by sunde is what you need. You just have to fine tune it.

[edprog]

I have this but it wont do it :(

it reads in a new line


for(int i =0;i < pointsnum;i++)
{

System.out.print("X"+i+":");
inputX = scan.nextInt();

System.out.print("Y"+i+":");
inputY = scan.nextInt();

mypoints.add(new Points(X,Y));


}

[sunde887]

What's the problem with that code exactly? There is one big error when you create the point object.

[edprog]

No the point object is fine, is the way I want to read the variables, i want to read

3 4 (where 3 is x and 4 is y)
2 3 (where 2 is x and 3 is y)


instead of

3
4
2
3

[sunde887]

Your code stores the user input in the variables inputX and inputY and then uses X and Y to create a point object. That's incorrect.

To do what you want is a bit more lines of code. You will be using nextLine from the scanner class to get a string, then strings split method and finally parse the values

loop 
  Declare and initialize string with nextLine
  Declare string array and initialize with split
  Create point object with parsed values from string array
End loop

[Dark]

Edit: Nvm, I didn't fully read your last post. Lol.

Sunde is correct, the way to accomplish your goal is to store the input to a string. Split the string and parse them into new variables. If this for a school project? If it is then you might not be able to use these tools depending on if you've learned them or not.