C++课堂作业(1)

github链接：

https://github.com/deepYY/object-oriented/tree/master/Circle

作业题目

Create a program that asks for the radius of a circle and prints the area of that circle, using cin and cout. The whole program shouldbedividedinto two source files (.cpp). Hand in the source files and the head files which youcreate

代码如下

main.cpp

#include <iostream>
#include<stdlib.h>
#include "circle_area.h"
using namespace std;
int main(int argc, char** argv) 
{
	double r,area;
	Circle_area ca;
	cin >> r;
	area = ca.get_area(r);
	cout << "S=" << area << endl; 
	return 0;
}

---

circle_area.h

#ifndef CIRCLE_AREA_H
#define CIRCLE_AREA_H
#define pi 3.14
#include <iostream>
class Circle_area
{
	public:
	double get_area(double r);
};
#endif

---

circle_area.cpp

#include "circle_area.h"
#include<stdlib.h>
#include <iostream>
double Circle_area::get_area(double r)
{
	return (r*r*pi);
}