/* head.h */
#ifndef __SUM_H__

#define __SUM_H__

#ifdef __cplusplus

extern "C" {

#endif

    int add(int a, int b);

    int sub(int a, int b);

#ifdef __cplusplus

}

#endif

#endif /* __SUM_H__ */

#include <iostream>

#include "head.h"

using namespace std;

int main()

{

    int a, b;

    cout << "请输入两个数字：" ;

    cin >> a >> b;

    cout << "相加：" << add(a, b) << endl;

    cout << "相减：" << sub(a, b) << endl;

}

#include <stdio.h>

#include "head.h"

int add(int a, int b)

{

	return a+b;

}

int sub(int a, int b)

{

	return a-b;

}