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/* main.cpp */#include <stdio.h>#include "main.h"#include "myclass.h"using namespace std;extern int Insteon::add(int num1, int num2);int main(void){	Insteon I;	printf("Hello\n");	int num;	num = I.add(5, 5);	printf("%d\n", num);}/* main.h */using namespace std;int main(void);extern int add(int num1, int num2);/*myclass.h*/class Insteon {	int add(int num1, int num2);};/* my class.cpp */#include <stdio.h>#include "myclass.h"#include "main.h"class Insteon {public:	int add(int num1, int num2)	{		return num1 + num2;	}};