16 replies to this topic

[arunjib]

I need code for the following output. If anybody have please post it
*******
******
*****
****

[wim DC]

How did this end up at the tutorials?
Anyway, first try. Fail, then we help: http://forum.codecal...html#post282982

[arunjib]

i tried the following code but cannot put leading space

import java.io.*;
public class pattern1
{
public static void main (String[] args) throws IOException
{
InputStreamReader read = new InputStreamReader(System.in);
BufferedReader in = new BufferedReader(read);
int i,j,n=0,k;
System.out.print("How many stars you want to print in first row ? ");
n=Integer.parseInt(in.readLine());
for (i = 0; i<n; i=i+2)
{
for (j=i; j<n;j++)
System.out.print ("*");
System.out.println();
}
}
}

output of the code is -----
How many stars you want to print in first row ? 5
*****
***
*
but i need
*****
****
***

[BlaineSch]

If you know the top row is 5, and the second amount of stars is 3, you know the difference is 2. Half of two is 1, which is also the number of spaces you want.

Simply add another loop before the output of the stars for adding spaces.

[arunjib]

I can think that logic but i cannot place the for loop before output of stars if possible just tell me the loop and tell in what position the loop shout apply i tried in several way but nothing fruitlul

If you know the top row is 5, and the second amount of stars is 3, you know the difference is 2. Half of two is 1, which is also the number of spaces you want.

Simply add another loop before the output of the stars for adding spaces.

[wim DC]

That's the structure you need:

int rows = Math.ceil(n/2);
for (i = 0; i<rows; i++)
{
  for(int k=0 ; ??; k++ ){
    System.out.print(" ");
  }
  for (j=0; ?? ;j++)
    System.out.print ("*");   
  }
  System.out.println();
}

the amount of spaces is 0,1,2,3 so finding the ?? for the 1st inner loop is simple, just k<=i

Edited by wim DC, 09 March 2011 - 06:27 AM.

[arunjib]

i dont know the use of Math.ceil() i want to read about it first. then i shall try this code.

That's the structure you need:

int rows = Math.ceil(n/2);
for (i = 0; i<rows; i++)
{
  for(int k=0 ; ??; k++ ){
    System.out.print(" ");
  }
  for (j=0; ?? ;j++)
    System.out.print ("*");   
  }
  System.out.println();
}

the amount of spaces is 0,1,2,3 so finding the ?? for the 1st inner loop is simple, just k<=i

[wim DC]

Well, to calculate the amount of rows, it's basicly n/2
like 6 are 3 rows required:

******
 ****
  **

But 7 are 4 rows, since 7/2 = 3.5, and integers don't accept commas, this will become 3 for Java.
Math.ceil() rounds the number up, so 3.5 becomes 4.

*******
 *****
  *** 
   *

[arunjib]

for Math.ceil() which library class should be imported?
should i put any value in substitute of ?? for both or the for loop?

Well, to calculate the amount of rows, it's basicly n/2
like 6 are 3 rows required:

******
 ****
  **

But 7 are 4 rows, since 7/2 = 3.5, and integers don't accept commas, this will become 3 for Java.
Math.ceil() rounds the number up, so 3.5 becomes 4.

*******
 *****
  *** 
   *

[tharindhu]

#include<stdio.h>
int main()
{
int x;
int y;
int z;
for(x=0;x<7;x=x++)
{
printf("\n");
for(z=-x;z<0;z++)
{
printf(" ");
}
for(y=x*2;y<7;y++)
{
printf("*");

}
}

}


try this

[Sinipull]

I would use something like this:

public static void draw(int amount){
        char[] pat = new char[amount];
        Arrays.fill(pat, '*');
        for(int i = 0; i < amount/2+1; i++){
            System.out.println(new String(pat));    
            pat[i] = pat[pat.length-i-1] = ' ';        
        }        
}

***************
 ************* 
  ***********  
   *********   
    *******    
     *****     
      ***      
       *    

Nested loop occurs, when println() prints the char array in String.

[arunjib]

thanks to all