多行输入java

Question

I want to write a program that reads this input:

 1 3 9 16 25 17 150312 0.5 13.8 2.4 

and it should output this:

1.00,1.00
3.00,1.73
9.00,3.00
16.00,4.00
25.00,5.00
17.00,4.12
150312.00,387.70
0.50,0.71
13.80,3.71
2.40,1.55

My Code is this:

import java.util.Scanner;

public class SqrtTable {

    public static void main(String args[]) {
        Scanner s = new Scanner(System.in); 
        if(StdIn.isEmpty()==true) {
        }
        else {
            output(s);
        }
    }

    public static void output(Scanner s) {
        double a = StdIn.readDouble();
//      
        StdOut.printf("%.2f, %.2f", a, Math.sqrt(a));
//      System.out.println(a);
        StdIn.readLine();
    }
}

My Code only puts out the first line. What do I have to change?

Answer 1

Try something like this:

Scanner sc = new Scanner(System.in);
String myString = sc.nextLine();
String[] flostr = myString.split(" ");
DecimalFormat df = new DecimalFormat("#.##");

for(String s : flostr){
   System.out.println(Float.parseFloat(s) +" ," + df.format(Math.sqrt(Float.parseFloat(s))));
}

Edit: Considering user input will be in different line, try something like:

public static void main(String args[]) {
   Scanner sc = new Scanner(System.in);
   List<String> list = new ArrayList<String>();

   System.out.println("Enter your numbers, enter 'end' when done: ");
   while(!sc.hasNext("end")){
       list.add(sc.next());
   }

   String[] flostr = list.toArray(new String[0]);
   for(String s : flostr){
       System.out.println(String.format("%.2f", Float.parseFloat(s)) +" ," + String.format("%.2f", (Math.sqrt(Float.parseFloat(s)))));
   }

}

Answer 2

By something like this

String[] splited = str.split("\\s+"); 
for(String s : splited){
System.out.println(s);
}