package IO;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class InputStreamReader00 {
public static void main(String[] args){
try {
InputStreamReader isr=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(isr);
while(true){
System.out.println("Radius?");
String str=br.readLine();
double radius;
try {
radius=Double.valueOf(str).doubleValue();
} catch (NumberFormatException nfe) {
System.out.println("Radius must be positive!");
continue;
}
double area=Math.PI*radius*radius;
System.out.println("Area is "+area);
return;
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
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