Program help will be very appreciated

Question

Hey,
I am now in my first semester of java programming and I constructed this program (listed below), but when I went to hand in this assignment my professor stated that I was missing some key parts of the program and that I did not successfully answer the problem. He also stated that my variables are mixed up. The problem given was construct a program that prompts the user to input a decimal number and outputs that number rounded to the nearest integer. Also, give two examples. So if anyone can assist me in fixing this problem I would really appreciate it. Thanks (program below)
import java.io.*;
public class DecimalNumbers1
     static BufferedReader keyboard = new
     BufferedReader(new InputStreamReader(System.in));
public static void main(String[] args) throws IOException
     int val;
     double answer;
System.out.println("Please input a decimal number: ");
double t = Double.parseDouble(keyboard.readLine());
answer = (t + .5);
}

Answer 1

Your class simply adds 0.5 to the input value - so if you put in 42.0 it will "round" it to 42.5 - which is clearly not what's intended. When you've amended your program try it with these input values and see if you get the right output:
42.0 --> 42
41.9 --> 42
42.1 --> 42
42.6 --> 43There is a class called "Math" which contains a round method. Read the documentation for it here:
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Math.html