作业4.21~4.22

最新推荐文章于 2025-03-31 04:30:21 发布

原创最新推荐文章于 2025-03-31 04:30:21 发布 · 529 阅读

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本文介绍了一个学生信息管理系统，通过类定义实现学生信息的存储与展示，并计算两个点之间的距离。

作业4.21

#include<iostream>
#include<string>
using namespace std;
class Student
{
public:
	Student(string name1,int number1,float score1);
    void show();
	void show_count_sum_ave();
private:
	string name;
	int number;
	float score;
	static int count;
	static float sum;
	static float ave;
};
Student::Student(string name1,int number1,float score1)
{
	name=name1;
	number=number1;
	score=score1;
	count++;
	sum+=score;
	ave=sum/count;
}
void Student::show()
{
	cout<<"name:"<<name<<endl;
	cout<<"number:"<<number<<endl;
	cout<<"score:"<<score<<endl;}
void Student::show_count_sum_ave()
{
cout<<"count:"<<count<<endl;
cout<<"sum:"<<sum<<endl;
cout<<"ave:"<<ave<<endl;
}
int Student::count=0;
float Student::sum=0.0;
float Student::ave=0.0;
int main()
{Student stu1("wu",26,90);
stu1.show();
stu1.show_count_sum_ave();
Student stu2("chen",4,88);
stu2.show();
stu2.show_count_sum_ave();
Student stu3("zhang",31,89.0);
stu3.show();
stu3.show_count_sum_ave();
return 0;
}

作业4.22

<pre class="cpp" name="code">#include <iostream>
#include <cmath>
using namespace std;
class Point
{
public:
    Point(float x_, float y_):x(x_),y(y_){}
	void showPoint()
	{cout << "(x,y)=(" <<x << "," << y << ")" << endl;}
    friend float dist_(Point &, Point &);
private:
    float x;
    float y;
};
float dist_(Point & A, Point & B)
{
   return sqrt((A.x-B.x)*(A.x-B.x)+(A.y-B.y)*(A.y-B.y));
}
int main()
{
    Point a(1.0, 2);
    Point b(1.0, 3);
    cout << "a点与b点间的距离是：" << dist_(a, b) <<endl;
    a.showPoint();
    b.showPoint();
    return 0;
}