1.多文件

文件c.h

class MyClass
{
    private:
        int x,y;
    public:
        void setValue(int x, int y);
        void disPlay();
};

文件fun.cpp

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

using namespace std;

void MyClass::setValue(int x, int y)
{
    //MyClass::x = x 或者 this->x = x
    //x = x 会出现错误！
    MyClass::x = x;
    MyClass::y = y;
}

void MyClass::disPlay()
{
    cout << "x = " << x << ",y = " << y << endl;
}

文件main.cpp

#include "fun.cpp"

int main()
{
    MyClass a;
    a.setValue(1,2);
    a.disPlay();
    return 0;
}