Array Index Out Of Bounds Exception

[manowar689]

hey could someone help me with this im new and am trying to make a program to work out subnet addresses i have made a class called read bit which i would like to take a reading of bit[0] and bit[1] here is the code

static void readbit() {

int count = 2;

double bit[] ;
bit = new double [count];

do {

	System.out.print ("\n\nPlease input  octet "+count+1+" :");
   	bit[count]= Keyboard.readDouble();
   	count++;

} while (count < 2 );

}

here is the output from jcreator

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
	at subnet.readbit(subnet.java:81)
	at subnet.main(subnet.java:66)

the line 66 error is just the access of readbit ();

thanks in advance :D

[senorbum]

The issue you have is that arrays are 0 based. Basically you are saying that you want bit[2] to equal whatever is inputted via the Keyboard. But earlier you created your bit array of size 2.

So your array is only able to store objects at positions 0 and 1. When you try to store something at position 2, its outside of the boundaries of the array.

[manowar689]

:confused: so wat should count equal for an array of two then or wat would you do different

[manowar689]

static void readbit() {

int count = 0;

double bit[] ;
bit = new double [2];

do {

	System.out.print ("\n\nPlease input the price of "+count+1+" :");
   	bit[count]= Keyboard.readDouble();
   	count++;

} while (count < 2 );

}

thx again man