CPP_First_Work

#include<iostream>

using namespace std;

class Cylinder{
	public:
		float radius;
		float height;
		float V;
		void read(){
			 float a,b;
			 cin >> a >> b;
			 radius = a,height = b;
		}
		void get_V(){
			V = 3.1415926 * height * radius * radius;
		}
		void print_data(){
			cout << "底圆半径："  << radius << " 高 ：" << height  << " 体积为： "  << V << endl;
		}
};

int main(){
	
	Cylinder a;
	a.read();
	a.get_V();
	a.print_data();
	
	
	return 0;
}

#include<iostream>

using namespace std;

class My_String{
	public:
		string content;
		int len;
		void set(){
			cin >> content;
		}
		void show(){
			cout << " 字符串为： " << content << endl;
		}
		void get_len(){
			len = content.size();
		}
		void add_string(string b){
			content += b;
		}
		void add_string2(){
			string c;
			cout << " 请输入你要在原字符串连接的字符串: " << endl;
			cin >> c;
			content += c; 
		}
};

int main(){
	
	My_String a;
	a.set();
	a.get_len();
	a.show();
	a.add_string2();
	a.show();
	return 0;
}

#ifndef _STUDENT_H_
#define _STUDENT_H_
#include<iostream>
#include<string>

using namespace std;

class Student{
	public:
		string number;
		string name;
		string sex;
		void set();
		void display();
};

#endif

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

using namespace std;


void Student::set(){
	string aa,bb,cc;
	cout << "input Student's number ,name and sex: " << endl;
	cin >> aa >> bb >> cc;
	Student::number = aa;
	Student::name = bb;
	Student::sex = cc;
}
void Student::display(){
	cout << " 学生的学号是： "  << Student::number << " 学生的姓名是： "  << Student::name << " 学生的性别是： "  << Student::sex << endl;
}

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

using namespace std;

int main(){
	
	Student a;
	a.set();
	a.display();
	
	return 0;
}