java实验.rar

package shiyan2; import java.lang.Math; import java.util.Scanner; public class Striangle { public double firstEdge; public double secondEdge; public double thridEdge; public void striangleArea(){ if(firstEdge+secondEdge>thridEdge&&firstEdge+thridEdge>secondEdge&&secondEdge+thridEdge>firstEdge){ double p = (firstEdge+secondEdge+thridEdge)/2; double area = Math.sqrt(p*(p-firstEdge)*(p-secondEdge)*(p-thridEdge));//求三角形的面积 System.out.println("输出三角形的面积："+area); } else{ double min; min = (firstEdge<secondEdge)?firstEdge:secondEdge; min = (min<thridEdge)?min:thridEdge;//取最小值 double area=min*min*Math.sqrt(3)/4;//求面积 System.out.println("输出三角形的面积："+area); } } public static void main(String[] args){ Scanner input = new Scanner(System.in); Striangle tr = new Striangle();//创建Striangle类的对象 System.out.print("请输入三个数："); tr.firstEdge = input.nextDouble(); tr.secondEdge = input.nextDouble(); tr.thridEdge =input.nextDouble(); tr.striangleArea();//调用求三角形面积的方法 } }