How to define I/O pins in if condition

[Ajinkya1413]

I want to define I/O pins depending on the model I define at the start.
let's consider I define model as A

#define MODEL "A"

then I want my input pins to be

#define IN1 12
#define IN1 14
#define IN1 16

And if I define model as B then I want to define pins differently. How can I do it?
I tried using #ifdef or #if but not sure how to use it properly. Any help is appreciated.

[UKHeliBob]

Your post was MOVED to it's current location as it is more suitable.

Could you also take a few moments to Learn How To Use The Forum.

Other general help and troubleshooting advice can be found here.
It will help you get the best out of the forum in the future.

[UKHeliBob]

Take a look at #ifdef by means of which you can check whether something is #defined and then conditionally #define more values

At its most basic, but there is much more that you can do

#define typeA

#ifdef typeA
  #define X 123
#endif

#ifdef typeB
  #define X 456
#endif

void setup()
{
  Serial.begin(115200);
  while (!Serial);
  Serial.println(X);
}

void loop()
{
}

[Whandall]

The preprocessor understands if too, I've seen this over and over.

#if ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif

[groundFungus]

//#define model_A
#define model_B

#ifdef model_A
#define IN1 12
#define IN2 14
#define IN3 16
#endif

#ifdef model_B
#define IN1 2
#define IN2 4
#define IN3 6
#endif

void setup()
{
   Serial.begin(115200);
   Serial.print("pin definitions   IN1 ");
   Serial.print(IN1);
   Serial.print("  IN2 ");
   Serial.print(IN2);
   Serial.print("  IN3 ");
   Serial.println(IN3);
}

void loop()
{
}

Bob beat me to it but this is a bit different.

[Ajinkya1413]

Thank you for the reply. Problem is solved.