//Program: Study_ArduinoCode_12variable.ino
//Study the local & global variables
int x, y; 
void setup(){
  int a = 7;
  Serial1.begin(115200);
  delay(1000);
  Serial1.print("a =");
  Serial1.print("a");
  Serial1.println(" ");
}

void loop(){
   int a = 2 , b = 4; //This is the local variabels: use only in setup()
  x = a + b;
  y = a*b;
  Serial1.print("x = a + b = ");
  Serial1.println(x); 
  Serial1.print("y = a*b = ");
  Serial1.println(y); 
}