// MACRO-START * MACRO-START * MACRO-START * MACRO-START * MACRO-START * MACRO-START *
// a detailed explanation how these macros work is given in this tutorial
// https://forum.arduino.cc/t/comfortable-serial-debug-output-short-to-write-fixed-text-name-and-content-of-any-variable-code-example/888298

#define dbg(myFixedText, variableName) \
  Serial.print( F(#myFixedText " "  #variableName"=") ); \
  Serial.println(variableName);

#define dbgi(myFixedText, variableName,timeInterval) \
  { \
    static unsigned long intervalStartTime; \
    if ( millis() - intervalStartTime >= timeInterval ){ \
      intervalStartTime = millis(); \
      Serial.print( F(#myFixedText " "  #variableName"=") ); \
      Serial.println(variableName); \
    } \
  }

#define dbgc(myFixedText, variableName) \
  { \
    static long lastState; \
    if ( lastState != variableName ){ \
      Serial.print( F(#myFixedText " "  #variableName" changed from ") ); \
      Serial.print(lastState); \
      Serial.print( F(" to ") ); \
      Serial.println(variableName); \
      lastState = variableName; \
    } \
  }

#define dbgcf(myFixedText, variableName) \
  { \
    static float lastState; \
    if ( lastState != variableName ){ \
      Serial.print( F(#myFixedText " "  #variableName" changed from ") ); \
      Serial.print(lastState); \
      Serial.print( F(" to ") ); \
      Serial.println(variableName); \
      lastState = variableName; \
    } \
  }
// MACRO-END * MACRO-END * MACRO-END * MACRO-END * MACRO-END * MACRO-END * MACRO-END *


int myInts[1];  //only need 1 cell in array
int a;


void setup() {
  Serial.begin(115200);
  Serial.println("Setup-Start");
}

void loop() {
  Serial.println("Top of Loop");
  a = 0;          //if a<0 6 will print out if a>=0 10 will print out
  dbg("01",a);  
  myInts[0] = a;  //value a= into array 0
  dbg("02",myInts[0] );  
  a = myInts[0];  // retrieve value a from array 0
  dbg("03",a);  

  delay(3000);      // value of a will print out here
  Serial.println("right before entering while-loop");

  while (a < 0) {
    Serial.println("inside while-loop");
    dbg("04 inside while-llop",a);  

    a = myInts[0];
    dbg("05 inside while-llop",a);  
    Serial.println(6); //6 will print out when looping in while statement
  }
  Serial.println("right after = while loop");

  Serial.println(10);
  delay(3000);
  Serial.println("bottom of Loop");
}