头文件(shape.h):

class Circle

{

public:

    

double calculate_perimeter(

double radius);

    

double calculate_area(

double radius);

private:

    

int radius;

};

 

shape.cpp:

#include 

"

shape.h

"

#define PI 3.14159

double Circle::calculate_perimeter(

double radius)

{

    

return 

2 * PI * radius;

}

double Circle::calculate_area(

double radius)

{

    

return PI * radius * radius;

}

 

主程序

test.cpp

#include <iostream>

#include 

"

shape.h

"

using 

namespace std;

int main()

{

    

int radius;

    

    cout<< 

"

Please input radius of the circle:

";

    cin>>radius;

    Circle c;

    cout << 

"

Circle Perimeter: 

" << c.calculate_perimeter(radius) <<endl;

    cout << 

"

Circle Area: 

" << c.calculate_area(radius) <<endl;

    

return 

0;

}

 

ubuntu下编译命令:

g++ -o test.exe shape.cpp test.cpp

 

运行结果:

Please input radius of the circle:5

Circle Perimeter: 31.4159

Circle Area: 78.5397

 

如果我门把头文件放在某个draw目录下

在主程序include的路径需要修改一下

#include "draw/shape.h"

 

编译指令:

g++ -o test.exe draw/*.cpp test.cpp