import java.util.Scanner; class Test3_13{ public static void main(String[] args){ double a,b,c; double m,s; //定义面积为m Scanner scan=new Scanner(System.in); System.out.println(\请输入 a b c 的值：\ System.out.print(\ a=scan.nextDouble();
System.out.print(\ b=scan.nextDouble();
System.out.print(\ c=scan.nextDouble();
if(a+b>c){ if(a+c>b){ if(b+c>a){ s=(a+b+c)/2;
m=Math.sqrt(s*(s-a)*(s-b)*(s-c));
System.out.println(\该三角形边长a=\ System.out.println(\面积为：\ } else System.out.println(\该数值不能够构成三角形\ } else System.out.println(\该数值不能够构成三角形\
}
else System.out.println(\该数值不能够构成三角形\
}
}
分别为\\n