这是我的程序清单 public class circle_area { pulic static void main(String[] args) { double area,radius; radius=IO.readDouble("Enter radius:"); area=3.14*raddius*radius; IO.showValue("The area for a circle of this radius is:",radius); System.exit(0); } } 提示是找不到符号IO
哪抄来的代码,IO是哪个对象? 给你一个样例:import java.io.*;public class test { public static void main(String[] args) { /* double area,radius; radius=IO.readDouble("Enter radius:"); area=3.14*raddius*radius; IO.showValue("The area for a circle of this radius is:",radius); System.exit(0); */
double area, radius; System.out.println("Enter radius:"); try { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); radius = Double.parseDouble(br.readLine()); area = 3.14 * radius * radius; System.out.print("The area for a circle of this radius is:" + area); } catch(Exception e) { e.printStackTrace(); } } }
public class circle_area
{ pulic static void main(String[] args)
{ double area,radius;
radius=IO.readDouble("Enter radius:");
area=3.14*raddius*radius;
IO.showValue("The area for a circle of this radius is:",radius);
System.exit(0);
}
}
提示是找不到符号IO
给你一个样例:import java.io.*;public class test
{
public static void main(String[] args)
{
/*
double area,radius;
radius=IO.readDouble("Enter radius:");
area=3.14*raddius*radius;
IO.showValue("The area for a circle of this radius is:",radius);
System.exit(0); */
double area, radius;
System.out.println("Enter radius:");
try
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
radius = Double.parseDouble(br.readLine());
area = 3.14 * radius * radius;
System.out.print("The area for a circle of this radius is:" + area);
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
没有导包
应该该windons的环境变量.里面有
IO.是什么啊,4楼正解