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Using BufferedReader to read input number from user

import java.io.BufferedReader; import java.io.InputStreamReader; public class Main {   public static void main(String[] args) throws Exception {     BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));     String input = reader.readLine();     double number = Double.parseDouble(input);     System.out.println(input + ":" + Math.sqrt(number));     reader.close();   } }