建立类cylinder

【3.23】建立类cylinder，cylinder的构造函数被传递了两个double值，分别表示圆柱体的半径和高度。用类cylinder计算圆柱体的体积，并储存在一个double变量中。在类cylinder中包含vol,用来显示每个cylinder对象的体积。

#include <iostream>
#include <stdio.h>
using namespace std;
class cylinder
{
public:
	double r;
	double h;
	double vol;
	void r_h_input()
	{
		cout<<"请输入圆柱体的底面半径和圆柱体的高:"<<endl;
		cin>>r;
		cin>>h;
	}
	void vol_out()
	{vol=3.14*r*r*h;
printf("The volume of cylinder is :%f\n",vol);
	}
};
	int main()
	{
		cylinder c1,c2;
		c1.r_h_input();
		c1.vol_out();
		c2.r_h_input();
		c2.vol_out();<pre class="cpp" name="code">#include <iostream>
#include <stdio.h>
using namespace std;
class cylinder
{
public:
	double r;
	double h;
	double vol;
	void r_h_input()
	{
		cout<<"请输入圆柱体的底面半径和圆柱体的高:"<<endl;
		cin>>r;
		cin>>h;
	}
	void vol_out()
	{vol=3.14*r*r*h;
printf("The volume of cylinder is :%f\n",vol);
	}
};
	int main()
	{
		cylinder c1,c2;
		c1.r_h_input();
		c1.vol_out();
		c2.r_h_input();
		c2.vol_out();
		return 0;
	}

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