--------------------main.cpp-----------------------------
#include <iostream>
#include "struct.h"
#include "class.h"
#include "init.h"
#include "const.h"


int main(int argc, char** argv)
{
	str *p;
	init(p);
	mem(p);
	show(p);
	std::cout << p->A<<std::endl;
	std::cout << p->E <<std::endl;
	
	return 0;
}
---------------------struct.h-------------------
//構造体
#ifndef STRUCT_H
#define STRUCT_H

typedef struct
{
	double A;
	double B;
	double	C;
	double D;
	double	E;
}str;

#endif

-----------------------init.h-------------------
//init.h
#ifndef INIT_H
#define INIT_H

#include "struct.h"

void init(str *p);

#endif

-----------------------init.cpp-------------------
void init(str *p)
{
	str DATA;
	DATA.A=1.0;
	DATA.E=1.0;
	std::cout<<"B=";
	std::cin >>DATA.B;
	std::cout<<"C=";
	std::cin >>DATA.C;
	std::cout<<"D=";
	std::cin >>DATA.D;
	
	p=&DATA;
}

---------------------------class.h-----------------
//class.h
#ifndef CLASS_H
#define CLASS_H

#include "struct.h"

void mem(str *p);
void show(str *p);

#endif


---------------------------class.cpp----------------------
using namespace std;

void mem(str *p)
{
	p->A=p->B*p->C;
	p->E=p->D*(A1+A2);
}

void show(str *p)
{
	cout<<p->A<<"="<<p->B<<"*"<<p->C<<endl;
	cout<<p->E<<"="<<p->D<<"*"<<"("<<A1<<"+"<<A2<<")"<<endl;	
}


------------------------------const.h-----------------
//const.h

static const double A1=20.0;
static const double A2=30.0;