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 11152012, 05:32 PM #1Member
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 Nov 2012
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Error in inverted Pascal triangle program
Hi everyone. I donīt know why the following error appears when I try to execute my program, so if anyone can help me please... xD
Source code:
import java.util.*;
public class pascal2 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int x = 0;
do {
System.out.print("How many values (1...13) ?");
x = in.nextInt();
} while ( x<1  x>13 );
int y = (x*2)1;
int [] a = new int [y];
int [][] b = new int [y][x];
int j = (x1);
int k = y;
for ( x = 0 ; x <= j ; x++ ) {
for ( y = 0 ; y < k ; y++ ) {
if ( x == 0 ) {
if ( y == (((k+1)/2)1) ) b[y][x] = 1;
else b[y][x] = 0;
}
else {
if ( y == 0 ) b[y][x] = b[y+1][x1];
else {
if ( y == (k1) ) b[y][x] = b[y1][x1];
else b[y][x] = b[y1][x1] + b[y+1][x1];
}
}
}
}
for ( x = j ; x >= 0 ; x ) {
for ( y = 0 ; y <= k ; y++ ) {
if ( y == (k1) ) {
if ( b[y][x] == 0 ) System.out.println(" ");
else System.out.println( b[y][x] );
}
else {
if ( b[y][x] == 0 ) System.out.print(" "); < line 43
else System.out.print( b[y][x] );
}
}
}
}
}
Error in cmd:
D:\>java pascal2
How many values (1...13) ?7
1 6 15 20 15 6 1
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 13
at pascal2.main(pascal2.java:43)Last edited by darkwolf1345; 11152012 at 05:41 PM.
 11152012, 06:06 PM #2Moderator
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Re: Error in inverted Pascal triangle program
Please use [code] tags [/code] when posting code.
I'm guessing here (as I don't read unformatted code), but you are accessing someArray[13] where someArray is only 13 elements long.
Arrays go from 0 to (arrayLength  1).Please do not ask for code as refusal often offends.
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 11152012, 06:27 PM #3Member
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 Nov 2012
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Re: Error in inverted Pascal triangle program
I fixed it, thanks a lot (I knew arrays go from 0 to lenght1, but you helped me remind it xD )
I didnt understand "Java Code:tags
 11152012, 07:28 PM #4
Re: Error in inverted Pascal triangle program
Guide For New Members
Please see that link for info on using code tags.
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