For loop integer AND string variable?

Question

Can someone tell me how I can change the values of x and y to '*' and '.'? Making the variables string doesn't help because I need N to be an integer as it is user input, and will conflict in loop.

import java.util.Scanner;

public class nvalue
{
public static void main(String[] args)
{
    int x, y, N;
    Scanner keyboard = new Scanner(System.in);
    System.out.print("Enter Value of N : ");
    N = keyboard.nextInt();

    for(x=2; x<=N; x++)
    {
        for(y=1; y<=5; y++)
        {
         System.out.println(y +" * "+ x + " = " + (x*y));
        }
        System.out.println("----------------------");
    }
}
}

Basically I need it to output this:

* * * * * * 
. * * * * *
. . * * * *
. . . * * *
. . . . * *
. . . . . *

to * and . under what criteria?

Lenny
– Lenny

2013-12-12 08:11:13 +00:00
Commented Dec 12, 2013 at 8:11 — Lenny
– Lenny, Commented Dec 12, 2013 at 8:11

giorashc · Accepted Answer · 2013-12-12 08:13:17Z

2

You can do :

for (int i = 0; i < N; ++i) {
  for (int j = 0; j < i; ++j) {
     System.out.print(".");
  }

  for (int j = i; j < N; ++j) {
     System.out.print("*");
  }

  System.out.println(); // Next line
}

Note the use of print and not println for printing without a line break.

answered Dec 12, 2013 at 8:13

giorashc

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4 Comments

Mumbleskates Over a year ago

You can even change the second for loop to for (; j < N; ++j) {, because as of the beginning of that loop, j is already equal to N.

giorashc Over a year ago

@Widdershins not true, j is visible only in the for block

Mumbleskates Over a year ago

Well that's easy, just replace the first for block with int j = 0; for (; j < i; ++j) {. This is still a very fast and clean way of doing it.

Mumbleskates Over a year ago

I'm sure this is all extremely negligible in impact and will save approximately 1 cpu cycle per row drawn, but it's still more elegant. In my book, if you can make it any faster without making it look way worse, there's no reason not to do so.

Triode · Accepted Answer · 2013-12-12 08:28:29Z

2

for(x=0; x<N; x++){
    String ln = "";
    for(y=0; y<5; y++){
       ln += (y < x) ? "* " : ". ";
    }
    System.out.println(ln);
}

edited Dec 12, 2013 at 8:28

answered Dec 12, 2013 at 8:14

Triode

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2 Comments

Tim B Over a year ago

It's the trinary comparison operator - essentially a way to put an if into one statement.

Leonne Over a year ago

now i understand. its not as complicated as looks lol. if y<x print "*", else print "." ... Boolean-ish. thanks.

Blub · Accepted Answer · 2013-12-12 08:11:31Z

1

for(x=1; x<=N; x++)
{
    for(y=1; y<=5; y++)
    {
      if (y >= x) {
         System.out.print(" * ");
      } else {
         System.out.print(" . ");
      }
    }
    System.out.println();
}

answered Dec 12, 2013 at 8:11

Blub

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Comments

Melquiades · Accepted Answer · 2013-12-12 08:19:27Z

0

public static void main(String[] args) {
    int x, y, N;
    Scanner keyboard = new Scanner(System.in);
    System.out.println("Enter Value of N : ");
    N = keyboard.nextInt();

    for(x=0; x<N; x++)
    {
        for(y=0; y<N; y++)
        {
            if (y >= x)    {
                System.out.print(" * ");
            }
            else {
                System.out.print(" . ");
            }
        }
        System.out.println();
    }

}

answered Dec 12, 2013 at 8:19

Melquiades

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Comments

Nilsaw · Accepted Answer · 2013-12-12 08:26:52Z

0

You can try this.

for(int x=0; x<N; x++){
  for(int y=0; y<N;y++){
   if(y<x){
      System.out.print(".");
    }else{
      System.out.print("*");
    }
   }
   System.out.println();
}

Damn, someone posted the same answer above me.

answered Dec 12, 2013 at 8:26

Nilsaw

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