#include <iostream.h>
#include <math.h>
const double ANG_TO_RAD=0.0174532925; //角度轉換成弧度的系數

class Angle
{ private:
     double value;
  public:
	 void SetValue(double);
	 double GetSine(void);
};

void Angle::SetValue(double a)
{  value=a;  }

double Angle::GetSine(void)
{  
	return sin(value*ANG_TO_RAD);  //把角度轉換為弧度并計算正弦值
}

void main()
{ Angle deg;
  deg.SetValue(60.0);
  cout<<"The sine of the angle is："<<deg.GetSine()<<endl;
}