#define HEADER_SIZE 32

char msg[32];

void incr_ref(char*& ptr) {  // reference to pointer
  ptr++;
}

char* incr_ret(char* ptr) {
  return ptr + 1;  // or return ++ptr;
}

char a = 'a';
char b = 'c';


void incr(char** ptr) {
  (*ptr)++;  // increment the pointer that ptr points to
}

char header[HEADER_SIZE];

void storeHeader(char** ptr, char* h) {
  memset(h, '\0', HEADER_SIZE);
  while (*ptr && **ptr != '\n') 
    *h++ = **ptr, (*ptr)++;
  if ((*ptr)[0] == '\n') (*ptr)++;
}

void setup() {
  Serial.begin(9600);
  uint8_t n;

  n = (a == 'a') ? ((b == 'b') ? 2 : 1) : 0;
  Serial.println(n);
  /*
  strcpy(msg, "hello\nworld");
  char* txt_buf;
  txt_buf = msg;

  Serial.print("buffer: '"); Serial.print(txt_buf); Serial.println("'"); 
  storeHeader(&txt_buf, header);
  Serial.print("buffer: '"); Serial.print(txt_buf); Serial.println("'"); 
  Serial.print("header: '"); Serial.print(header); Serial.println("'"); 
  */
  /*
    strcpy(msg, "hello");
    char* str = msg;  // str points to "hello"
    Serial.println(str);
    
    incr(&str);       // pass address of str
    Serial.println(str);

    incr_ref(str);
    Serial.println(str);

    str = incr_ret(str);
    Serial.println(str);
  */
}

void loop() {
  // put your main code here, to run repeatedly:

}