Thread: comparing values in a boolean array

Hi,

I am trying to figure out how compare two values in a boolean array. For example:

if [i] = true, compare [i+1] and [i-1]... then, if one is true, and the other is false, [i] = true.

Here's a snippet of what I am working on:

public static void theLivingDead(boolean[] villagers) {

for (int i=0; i<villagers.length; i++) {
if (villagers[i] == true) {
if (villagers[i++] == true && villagers[i--] == false) {
villagers[i] = false;
}
else {
villagers[i] = true;
}
}
else {
if (villagers[i++] == true && villagers[i--] == false) {
villagers[i] = true;
}
else {
villagers[i] = false;
}
}

}
}

You can probably see what I am trying to do by reading the code, however, I am clearly missing something.

Hi,

I am trying to figure out how compare two values in a boolean array. For example:

if [i] = true, compare [i+1] and [i-1]... then, if one is true, and the other is false, [i] = true.

Here's a snippet of what I am working on:

public static void theLivingDead(boolean[] villagers) {
 
      for (int i=0; i<villagers.length; i++) {
            if (villagers[i] == true) {
                if (villagers[i++] == true && villagers[i--] == false) {
                    villagers[i] = false;
                }
               else {
                    villagers[i] = true;
               }
     }
     else {
          if (villagers[i++] == true && villagers[i--] == false) {
              villagers[i] = true;
          }
          else {
              villagers[i] = false;
          }
     }
 
}
}

You can probably see what I am trying to do by reading the code, however, I am clearly missing something.

in

if(theArray[i] == theArray[idx2])  { // compare two values in an array

'idx2' would be a seperate index, correct?

I am trying to compare three 'side by side' values..

say for instance, [3] = true, I want to see whether or not [2] is true/false, and also whether or not [4] is true/false ((((within the same array)))).... and be able to keep, or alter the value of [3]....

I'm not sure now, honestly, though I believe I would want to test all of them. This is how the algorithm reads:

if the current villager is alive:
* if only one neighbor is alive, the current villager is dead in the next generation.
* otherwise,the current villager is alive in the next generation.
*
otherwise (the current villager is dead):
* if only one neighbor is alive, the current villager is alive in the next generation.
* otherwise, the current villager is dead in the next generation.
*

I have managed to see a positive change within the last few moments of your time, Norm, Thank you! Although I have managed to breach a wall, thanks to you, I believe now I have quite a-ways to get yet. Here's what my code looks like now:

 for (int i=0; i<villagers.length; i++) {
		 	 	 if (villagers[i]) {
		 	 	 	 if (villagers[i+1] && !villagers[i-1]) {
		 	 	 	 	 villagers[i] = false;
		 	 	 	 }
		 	 	 	 else {
		 	 	 	 	 villagers[i] = true;
		 	 	 	 }
		 	 	 }
		 	 	 else {
		 	 	 	 if (villagers[i+1] && !villagers[i-1]) {
		 	 	 	 	 villagers[i] = true;
		 	 	 	 }
		 	 	 	 else {
		 	 	 	 	 villagers[i] = false;
		 	 	 	 }
		 	 	 }

I will provide tests for the different combinations, and report back. Thanks again for the help!