user66820: How can I set an array pointer to null?
I have a pointer to a 3 int array that I am trying to set to null. 

int (*EXCLUSIVE_COLOR)[3];

Per this link I was trying to set it to null upon initialization.
However this does not assign a null value to it. It assigns three 'random' integers to the array elements:

{128, 447, 451}

How can I make it point to a null or empty value?

user4143: Here is a full example that shows you all thing things you have been asking over the past few days:
int colors[][3] = {
    {255, 0, 0},
    {0, 255, 0},
    {0, 0, 255}
};

#define NCOLOR (sizeof(colors) / sizeof(colors[0]))

int *EXCLUSIVE_COLOR = NULL;

void setup() {
    Serial.begin(115200);
    Serial.print("You have ");
    Serial.print(NCOLOR);
    Serial.println(" colors defined.");
    reportColor();
    EXCLUSIVE_COLOR = colors[2];
    reportColor();
    EXCLUSIVE_COLOR = NULL;
    reportColor();
}

void loop() {

}

void reportColor() {
    if (!EXCLUSIVE_COLOR) {
        Serial.println("Color is not set");
    } else {
        Serial.print("Color is set to ");
        Serial.print(EXCLUSIVE_COLOR[0]);
        Serial.print(",");
        Serial.print(EXCLUSIVE_COLOR[1]);
        Serial.print(",");
        Serial.println(EXCLUSIVE_COLOR[2]);
    }
}

You have an array of colours. You have a pointer that can point at a colour or at nothing. It starts off pointing at nothing. The code recognises that it's pointing at nothing and reports it. It gets assigned to a specific colour in your colours array. The code recognises that it's now a valid value and reports it. The pointer then gets pointed to nothing again. Again the code recognises that and tells you.
The result:
You have 3 colors defined.
Color is not set
Color is set to 0,0,255
Color is not set


66820: <p>How can I set an array pointer to <strong>null</strong>?</p>

<p>I have a pointer to a 3 int array that I am trying to set to <strong>null</strong>. </p>

<blockquote>
  <p>int (*EXCLUSIVE_COLOR)[3];</p>
</blockquote>

<p><a href="https://arduino.stackexchange.com/questions/76201/assigning-an-empty-array-row-to-reference">Per this link</a> I was trying to set it to null upon initialization.<br>
However this does not assign a null value to it. It assigns three 'random' integers to the array elements:</p>

<blockquote>
  <p>{128, 447, 451}</p>
</blockquote>

<p>How can I make it point to a <strong>null</strong> or <strong>empty</strong> value?</p>
 4143: <p>Here is a full example that shows you all thing things you have been asking over the past few days:</p>

<pre><code>int colors[][3] = {
    {255, 0, 0},
    {0, 255, 0},
    {0, 0, 255}
};

#define NCOLOR (sizeof(colors) / sizeof(colors[0]))

int *EXCLUSIVE_COLOR = NULL;

void setup() {
    Serial.begin(115200);
    Serial.print("You have ");
    Serial.print(NCOLOR);
    Serial.println(" colors defined.");
    reportColor();
    EXCLUSIVE_COLOR = colors[2];
    reportColor();
    EXCLUSIVE_COLOR = NULL;
    reportColor();
}

void loop() {

}

void reportColor() {
    if (!EXCLUSIVE_COLOR) {
        Serial.println("Color is not set");
    } else {
        Serial.print("Color is set to ");
        Serial.print(EXCLUSIVE_COLOR[0]);
        Serial.print(",");
        Serial.print(EXCLUSIVE_COLOR[1]);
        Serial.print(",");
        Serial.println(EXCLUSIVE_COLOR[2]);
    }
}
</code></pre>

<p>You have an array of colours. You have a pointer that can point at a colour or at nothing. It starts off pointing at nothing. The code recognises that it's pointing at nothing and reports it. It gets assigned to a specific colour in your colours array. The code recognises that it's now a valid value and reports it. The pointer then gets pointed to nothing again. Again the code recognises that and tells you.</p>

<p>The result:</p>

<pre><code>You have 3 colors defined.
Color is not set
Color is set to 0,0,255
Color is not set
</code></pre>
