问在Arduino草图中包含.cpp和.h文件的正确方法

EN

char foo;            // required to clean up some other problems
#include <Arduino.h> // tried it in desperation, no help
#include "a.h"

void setup(){
  Serial.begin(9600);
  Serial.println("\nTest begins");
  for (int num = -1; num < 1; num++){
    Serial.print(num);
    if (isNegative(num)){
      Serial.println(" is negative");
    } else {
      Serial.println(" is NOT negative");
    }
  }
}

void loop(){}

#ifndef H_A
#define H_A

boolean isNegative(int x);                  // Err#1
int anotherOdity();

#endif // H_A

#include "a.h"

int isNegative(int x){
  Serial.println("I can't print this from inside my INCLUDE FILE"); //Err#2
  if (x<0) return true;
  return false;
}

int anotherOdity(){
  char ch[5];
  memcpy(ch,"1",1);  //doesn't work, memcpy not declared      // Err#3
}

In file included from a.cpp:1:
a.h:4: error: 'boolean' does not name a type
a.cpp: In function 'int isNegative(int)':
a.cpp:4: error: 'Serial' was not declared in this scope
a.cpp: In function 'int anotherOdity()':
a.cpp:11: error: 'memcpy' was not declared in this scope

#ifndef H_A
#define H_A

boolean isNegative(int x){
  Serial.println("I can't print this from inside my INCLUDE FILE");
  if (x<0) return true;
  return false;
}

int anotherOdity(){
  char ch[5];
  memcpy(ch,"1",1);  //doesn't work, memcpy not declared
}

#endif // H_A