类分成多文件
circle.h
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| #pragma once
class Circle
{
public:
void setR(double r);
double getR();
double getArea();
double getGirth();
private:
double m_R;
double m_area;
double m_girth;
};
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circle.cpp
在类的外部创建类方法需要使用作用域名;
函数类型 类名::类方法(函数形参)
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| #include "Circle.h"
double Circle::getArea() {
m_area = 3.14 * m_R * m_R;
return m_area;
}
double Circle::getGirth() {
m_girth = 2 * 3.14 * m_R;
return m_girth;
}
double Circle::getR() {
return m_R;
}
void Circle::setR(double r)
{
m_R = r;
}
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main.cpp
使用Circle类需要引用类头文件#include"Circle.h"
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| #include<iostream>
#include"Circle.h"
using namespace std;
int main(int argc, char* argv[])
{
Circle c;
c.setR(10.0);
cout << c.getArea() << endl;
cout << c.getGirth() << endl;
cout << c.getR() << endl;
return 0;
}
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