第五次c++作业报告

来源：互联网发布：java数组赋值未满长度编辑：程序博客网时间：2024/05/22 08:02
一、问题及代码
/**文件名称：03.cpp*作        者：钟金勇*完成日期：2017年4月24号*版  本  号：vc++6.0*对任务及求解方法的描述部分：*输入描述：*问题描述：*程序输出：*问题分析：*算法分析：*/#include <iostream>  #include<cmath>  using namespace std;  class Triangle  {  public:      void setABC(double x,double y,double z);      double perimeter();      double area();  private:      double a,b,c;    };  int main()  {     Triangle tri1;     tri1.setABC(4,5,6);     cout<<"三角形周长:"<<tri1.perimeter()<<'\t'<<"面积为:"<<tri1.area()<<endl;  return 0;  }  void Triangle::setABC(double x,double  y,double z)  {      a=x;      b=y;      c=z;  }  double Triangle::perimeter()  {      return a+b+c;  }  double Triangle::area()  {      double z;      z=0.5*(a+b+c);     return sqrt(z*(z-a)*(z-b)*(z-c));  }#include <iostream>  #include<cmath>  using namespace std;  class Triangle  {  public:  Triangle(double x=1,double y=1,double z=1)  {a=x;b=y;c=z;}      double area();      double perimeter();      bool  isTriangle()      {          if(a+b>c&&b+c>a&&a+c>b)              return true;          else return false;      }      double getA()      {          return a;      }      double getB()      {          return b ;      }      double getC()      {          return c;      }   void showmessage();  private:      double a,b,c;  };  double Triangle::perimeter()  {      return a+b+c;  }  double Triangle::area()  {      double z;   z=((a*a+b*b-c*c)/(2*a*b));   return 0.5*a*b*sqrt((1-z*z));  }   void Triangle::showmessage()   {        if(isTriangle())     {     cout<<"三条边为:"<<getA()<<','<<getB()<<','<<getC()<<endl;     cout<<"三角形的周长为:"<<perimeter()<<'\t'<<"面积为:"<<area()<<endl;     }     else      cout<<"不能构成三角形"<<endl;  }  int main()  {     Triangle Tri1(7,8,9);     Tri1.showmessage();     return 0;  }#include <iostream>  #include<cmath>  using namespace std;  class Triangle  {  public:  Triangle(double x=1,double y=1,double z=1)  {a=x;b=y;c=z;}  Triangle (Triangle &p);      double area();      double perimeter();      bool  isTriangle()      {          if(a+b>c&&b+c>a&&a+c>b)              return true;          else return false;      }      double getA()      {          return a;      }      double getB()      {          return b ;      }      double getC()      {          return c;      }  void showmessage();  private:      double a,b,c;  };  Triangle::Triangle (Triangle &p)  {      a=p.a;      b=p.b;      c=p.c;  }  double Triangle::perimeter()  {      return a+b+c;  }  double Triangle::area()  {      double z;   z=((a*a+b*b-c*c)/(2*a*b));   return 0.5*a*b*sqrt((1-z*z));  }   void Triangle::showmessage()   {        if(isTriangle())     {     cout<<"三条边为:"<<getA()<<','<<getB()<<','<<getC()<<endl;     cout<<"三角形的周长为:"<<perimeter()<<'\t'<<"面积为:"<<area()<<endl;     }     else      cout<<"不能构成三角形"<<endl;  }  int main()  {     Triangle Tri1(7,8,9);     Tri1.showmessage();     Triangle Tri2(Tri1);     Tri2.showmessage();     return 0;  }#include <iostream>  #include<cmath>  using namespace std;  class Triangle  {  public:  Triangle(double x=1,double y=1,double z=1)  {a=x;b=y;c=z;}      double area();      double perimeter();      bool  isTriangle()      {          if(a+b>c&&b+c>a&&a+c>b)              return true;          else return false;      }      double getA()      {          return a;      }      double getB()      {          return b ;      }      double getC()      {          return c;      }   void showmessage();  private:      double a,b,c;  };  double Triangle::perimeter()  {      return a+b+c;  }  double Triangle::area()  {      double z;   z=((a*a+b*b-c*c)/(2*a*b));   return 0.5*a*b*sqrt((1-z*z));  }   void Triangle::showmessage()   {        if(isTriangle())     {     cout<<"三条边为:"<<getA()<<','<<getB()<<','<<getC()<<endl;     cout<<"三角形的周长为:"<<perimeter()<<'\t'<<"面积为:"<<area()<<endl;     }     else      cout<<"不能构成三角形"<<endl;   }  int main()  {     Triangle Tri1;       Tri1.showmessage();       Triangle Tri2(1.5);       Tri2.showmessage();       Triangle Tri3(1.5,1.5);       Tri3.showmessage();      Triangle Tri4(7,8,9);       Tri4.showmessage();     return 0;  }
二、运行结果
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