import java.util.*;
public class Sanjiaoxing {
/**
* @param args
*/
public static float zhouchang(float a,float b,float c)
{
float p;
p=a+b+c;
return p;
}
public static float mianji(float p,float a,float b,float c)
{
float s;
s=(float)Math.sqrt((float)p*(p-a)*(p-b)*(p-c));\\海伦公式
return s;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(“Input a:”);
float a=new Scanner(System.in).nextFloat();
System.out.println(“Input b:”);
float b=new Scanner(System.in).nextFloat();
System.out.println(“Input c:”);
float c=new Scanner(System.in).nextFloat();
float p=zhouchang(a,b,c);
System.out.println(“周长是 “+p);
float s=mianji(p/2,a,b,c);
System.out.println(“面积是”+s);

}

}