int val_A0 = 0;
int pont_A0 = A0;

int val_A3 = 0;
int pot_A3 = A3;

void setup() {
  pinMode(pont_A0, INPUT);  
  pinMode(pot_A3, INPUT);
  Serial.begin(9600);
}

void loop() {
  val_A0 = analogRead(pont_A0);
  val_A3 = analogRead(pot_A3);
  moniteur();
  delay(100);
}

void moniteur() {
  Serial.print("val_A0= "); Serial.print(val_A0);Serial.print(" | ");
  Serial.print("val_A3= "); Serial.print(val_A3);
  Serial.println();
}