CODEWITHSUNDEEP
javaloops
Anantha Raman
Anantha Raman

Reputation: 197

Pattern printing using single loop

I have written the code for printing slash using 2 for loops. How can I print the same using only one for loop?

public static void main(String[] args)
{
int i,j;char[][] ch=new char[100][100];
for(i=0;i<4;i++)
{
    for(j=0;j<4;j++)

    {
        if(i==j)
            ch[i][j]='*';
        else
            ch[i][j]=' ';
        System.out.print(ch[i][j]);

    }
    System.out.println(' ');
}

Upvotes: 2

Views: 658

Answers (2)

user31415
user31415

Reputation: 466

Still slower:

For(int i = 0; i < width*height; i++) {
  Int x = i%height
  Int y = (i-x)/height
  // Code using ch[x][y]
}

Edited via phone :)

Upvotes: 2

Ray Toal
Ray Toal

Reputation: 88378

Here is one way:

import java.util.Arrays;
public class App {
  public static void main(String[] args) {
    char[] line = new char[100];
    for (int i = 0; i < 4; i++) {
      Arrays.fill(line, ' ');
      line[i] = '*';
      System.out.println(line);
    }
  }
}

The idea is to use array-based operations (in this case, fill) to avoid one of the explicit loops.

Upvotes: 2

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