计算三角形的周长

            private double shang;
            private double xia;
            private double gao;
            
            
            public double Zhouchang(double a,double b, double c)
            {
                shang=a;
                xia=b;
                gao=c;
                return a+b+c;
            }



Sanjiao sj=new Sanjiao();
        System.out.println("三角形的周长为："+sj.Zhouchang(30.5,20,27.4));