Thread: Trying to create Triangles with Characters and Spaces

So I am trying to create this with my program:
AAAAAAAA
AAAAAAA
AAAAAA
AAAAA
AAAA
AAA
AA
A
I am supposed to import the number of rows and the characters from a data file.
Here is the code I wrote for it:

import java.util.*;
import java.io.*;
public class Lab11d {
public static void main(String []args) throws IOException
{
Scanner input = new Scanner(new File("Lab11d.dat"));
while(input.next().equals("y"))
{
int row = input.nextInt();
char col = input.next().charAt(0);
String output = "";
for(int i = row; i>0; i--)
{
for(int j = i; i>0;j--)
{
if(j==row)
{
output+="";
continue;
}
else
output+=" ";
}
for(int k = row; k>0; k--)
output+=col;
}
System.out.println(output);
}
}
}

Here is the data file:
8 A
2 B
1 T
3 B


I don't have any errors that Eclipse found. When I run it, nothing is printed in the console. Does anyone have any suggestions?

The spaces are supposed to be on the left side of the characters for the output.

try this piece of code I just made...Might help..:

PHP Code:

import java.io.*;
public class p_no3{
      public static void main(String[] args){
      int e;
      int j;
      for (e=9;e>=1;e--){
           for(j=e;j>=1;j--){
           System.out.print ("A");}
             System.out.println (" ");
           }
     }
} 


Thank you! Your code works perfectly but unfortunately I need the spaces to be on the other side of the A. It would look like this except with spaces instead of underscores:
AAAAA
_AAAA
__AAA
___AA
____A

And I also need to know why it won't read my data file.

I've now done this:

PHP Code:

import java.io.*; 
public class test{ 
      public static void main(String[] args){ 
      int e; 
      int j; 
      int k;
      String output = "";
      for (e=9;e>=0;e--){ 
          for(k=e; k>=e-1; k-=1)
              if(e==9)
                  k=e+1;
              else
                  output+=" ";
          for(j=k+e; j<e;j++) 
             output+="A";
           output+="\n";
       
      }
      System.out.println(output);
  }
} 


And now it won't output anything.

Another technique that will help you understand what your code is to do is to use variable names with meanings. You app is working with rows and columns and the number of spaces on a row and the number of characters on a row. If you were to name your variables with appropriate names then reading the code would help you understand what the code is doing.

What are e, k and j. Something like: Row, column and number of char?