用c++求三角形面积

以下的程序，假设肯定可以构成三角形：

程序先读入三个浮点数作为三角形的三边长。然后计算出它的半周长。再利用海伦公式计算出三角形的面积，最后输出这个面积值。

double a,b,c,p,s

cin>>a>>b>>c

p=(a+b+c)/2

s=sqrt(p*(p-a)*(p-b)*(p-c))

cout<<s<<endl

using System

using System.Collections.Generic

using System.Linq

using System.Text

namespace AreaDemo

{

class Program

{

const double PI = 3.1415926

static void Main(string[] args)

{

//求三角形面积例子,另外两个求法类同

Console.WriteLine("请输入三角形的相应数据:")

Console.Write("底边长:")

string bases = Console.ReadLine()

Console.Write("高:")

string height = Console.ReadLine()

Area method = new Area()

double area = method.GetTriangleArea(Convert.ToDouble(bases), Convert.ToDouble(height))

Console.WriteLine("三角形面积为:" + area.ToString())

Console.Read()

}

class Area

{

/// <summary>

/// 求三角形面积

/// </summary>

/// <param name="bases">底边</param>

/// <param name="height">高</param>

/// <returns>面积</returns>

public double GetTriangleArea(double bases, double height)

{

return bases * height / 2

}

/// <summary>

/// 求正方形面积

/// </summary>

/// <param name="side">边长</param>

/// <returns>面积</returns>

public double GetSquareArea(double side)

{

return side * side

}

/// <summary>

/// 求圆面积

/// </summary>

/// <param name="radius"></param>

/// <returns></returns>

public double GetCircleArea(double radius)

{

return PI * radius * radius

}

}

}

}

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