Thread: One Decimal Place

Hello there... I want to convert the output to one decimal place but what I got is "Cannot format given Object as a Number". Can anyone help me out? Thank you

//Assignment 1 Question 2
 
import java.text.*;
 
 
public class darjahCelcius
 
{
 
	public static void main(String[] args) 
 
		{
 
 
			System.out.println("Celsius\t\tFahrenheit\t|\tFahrenheit\t\tCelsius");
 
			System.out.println("----------------------------------------------------------");
 
			double celsius = 40; double fahrenheit = 120;
 
			NumberFormat formatter = new DecimalFormat("#0.0");
 
			for (int i = 1; i <= 10; celsius--, fahrenheit -= 10, i++) 
 
				{
 
					System.out.println(formatter.format(celsius + "\t\t" +celsiusToFahrenheit(celsius) + "\t\t|\t" + fahrenheit + "\t\t\t" +
					fahrenheitToCelsius(fahrenheit)));
 
				}
 
		}
 
			public static double celsiusToFahrenheit(double celsius) 
 
				{
					return (9.0 / 5.0) * celsius + 32;
				}
 
			public static double fahrenheitToCelsius(double fahrenheit) 
 
				{
					return (5.0 / 9) * (fahrenheit - 32);
			 	}
 
}

The error message is telling you exactly what is wrong. You use a DecimalFormatter to format a number period, but you're trying to pass it a whole complex String complete with several numbers and tabs(?). Instead why not simply pass it the number that you want to format and use its returned String in your output? You can use the formatter as many times as you want if you want to format several numbers, but again, only pass into it a single number.

Thanks for your reply.. But can you teach me how to do that?

Originally Posted by Akirien

Thanks for your reply.. But can you teach me how to do that?

I'm trying. Again, what you're doing is creating a DecimalFormat object called formatter, and you're trying to format a non-numeric String. What you've got is:

String myResultString = formatter.format( this huge complex String with numbers and tabs and what not).

What you need to do instead is

String myResultString = "Some complex String " + formatter.format(/*some number goes here*/) + 
          " more String here " + formatter.format(/*another number goes here*/); // etc....

Clear as Mudd?

thanks!!! got it...hehe.. thanx a lot..

You're welcome!