Problem with or in if loop |solved|

I want to create a loop that will not work if one of the two specific buttons are pressed.
So I tried the if loop with one condition and it worked.

#include <Keypad.h>

const byte ROWS = 4; 
const byte COLS = 4; 
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {5, 4, 3, 2}; 
byte colPins[COLS] = {9, 8, 7, 6}; 
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
int x=1;
char key;

void setup() 
{
   Serial.begin(9600);

}

void loop(){
  char key = keypad.waitForKey();
  
  if (key!='3')
  {
    Serial.println(key);
  }
}

After this I tried two condition as listed on the OR page.

if (key!='3'||key!='5')

And it did not worked. So I tried this.

if (key!='3'|key!='5')

I tried also.

if (key!='3' or key!='5')

But none of them work, so for now Im stuck with 2 if loops. can I do the two parameters in one loop?

Try && instead.

Try writing the statement out in words:
if key is not equal to 3 or key is not equal to 5

If key is 3 then it is not equal to 5, likewise if key is 5 it is not equal to 3.

You need and not or.

if key is not equal to 3 and not equal to 5.

As WildBill has written AND is &&.

Okay thanks it solved the problem. Do you know why the option of or do not work?

Hi, I’m testing Wokwi, and made a simulation for your sketch: https://wokwi.com/arduino/projects/297664379757789704.
Click the green start button to run. Click the stop button to change the sketch.

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