2673 3-4 计算长方形的周长和面积 痛定思痛。 2022-06-05 05:53 187阅读 0赞 ### ### 3-4 计算长方形的周长和面积 Time Limit: 1000MS Memory Limit: 65536KB #### Problem Description #### 通过本题的练习可以掌握拷贝构造函数的定义和使用方法; 设计一个长方形类Rect,计算长方形的周长与面积。类中有私有数据成员Length(长)、Width(宽),由具有缺省参数值的构造函数对其初始化,函数原型为:Rect(double Length=0, double Width=0); 再为其定义拷贝构造函数,形参为对象的常引用,函数原型为:Rect(const Rect &); 编写主函数,创建Rect对象r1初始化为长、宽数据,利用r1初始化另一个Rect对象r2,分别输出对象的长和宽、周长和面积。 要求: 创建对象 Rect r1(3.0,2.0),r2(r1); #### Input #### 输入两个实数,中间用一个空格间隔;代表长方形的长和宽 #### Output #### 共有6行; 分别输出r1的长和宽;r1的周长;r1的面积;r2的长和宽;r2的周长;r2的面积;注意单词与单词之间用一个空格间隔 #### Example Input #### 56 32 #### Example Output #### the length and width of r1 is:56,32 the perimeter of r1 is:176 the area of r1 is:1792 the length and width of r2 is:56,32 the perimeter of r2 is:176 the area of r2 is:1792 #### Hint #### **输入**\-7.0 -8.0 **输出** the length and width of r1 is:0,0 the perimeter of r1 is:0 the area of r1 is:0 the length and width of r2 is:0,0 the perimeter of r2 is:0 the area of r2 is:0 #include <bits/stdc++.h> using namespace std; class group { public: group() { length = 0; width =0; } group(group &r1) { length = r1.length; width = r1.width; } void get_in() { cin >> length >> width; if(length < 0||width < 0) { length = 0; width = 0; } } void put_out1() { cout << "the length and width of r1 is:"; cout << length << ',' << width << endl; cout << "the perimeter of r1 is:"; cout << 2*(length+width) << endl; cout << "the area of r1 is:"; cout << length * width << endl; } void put_out2() { cout << "the length and width of r2 is:"; cout << length << ',' << width << endl; cout << "the perimeter of r2 is:"; cout << 2*(length+width) << endl; cout << "the area of r2 is:"; cout << length * width << endl; } private: double length, width; }; int main() { group r1,r2; r1.get_in(); r2 = r1; r1.put_out1(); r2.put_out2(); return 0; }
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