a2.java

来自「初学java,最近帮同学作的一些实验」· Java 代码 · 共 46 行

package mypackage;
import java.util.*;
public class A2 implements inputer,computer{
  int a,b,c;
  public void input()
  {
	  System.out.print("请输入该一元二次方程的系数a,b,c:  " );
	  Scanner cin=new Scanner(System.in);
	  a=cin.nextInt();
	  b=cin.nextInt();
	  c=cin.nextInt();
  }
  public class prepare{
	 public double prepare1()
	  {
		  double result=Math.pow(b,2)-4*a*c;
		  return result;
	  }
	  public double prepare2()
	  {
		  double result=(-b+Math.pow(prepare1(),0.5))/(2*a);
		  return result;
	  }
	  public double prepare3()
	  {
		  double result=(-b-Math.pow(prepare1(),0.5))/(2*a);
		  return result;
	  }
  }
  public void comput()
  {
	  prepare P=new prepare();
	  if(P.prepare1()<0)
		  System.out.println("该方程无解" );
	  else
		   if(a==0)
			 { double result=-c/b;
			   System.out.println("该方程的解为： "+result);}
	       else
		  {
			 System.out.println("方程的第一个解为:"+P.prepare2());
			 System.out.println("方程的第二个解为:"+P.prepare3());
		  }
  }
}