>>823
#ifndef DIF_H
#define DIF_H

class Chara {
int i;
public:
Chara(int j = 0) : i(j) {}
int susumu() const { return i; };
};

#endif

---------------------------------

#include <iostream>
#include "different_header.h"

int Chara::susumu() const { return i; };

int main()
{
Chara c(123);

std::cout << c << std::endl;
}