第五次c++作业报告

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*文件名称：aaa.cpp

*作者：李钊

*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;
}

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