How do I enter decimals in Java

[teohzj123]

Hi,I'm new to Java programming and I just started like a day ago.I'm using NetBeans 7.3.1

My task is to convert any value in degrees celcius to fahrenheit.The task says something about float..I don't know what's float so I didn't use it

This is what I wrote.Apparently it worked but once I entered decimal values it comes out with an error.Can someone please teach me?And what is float? :)

package lab1task2;
import java.util.Scanner;

public class Lab1Task2 {


public static void main(String[] args) {

Scanner input = new Scanner( System.in );
int number1;
int sum;

System.out.print ( "Enter temperature in degrees Celcius=");
number1 = input.nextInt();

sum = number1*9/5 +32;

System.out.printf ( "Temperature in degrees Fahrenheit = %d\n", sum );

[JosAH]

Your program uses number without a fractional part (ints); Java has a couple of types that can handle those fractional parts: float, double and BigDecimals; floats and doubles are both primitive types (a double can store larger numbers and more fractional digits than a float); instead of using ints, use floats or doubles; also use the nextDouble() or nextFloat() method of the Scanner object and see the result ...

kind regards,

Jos

[teohzj123]

How do I do them?I am very new to Java.

[JosAH]

How do I do them?I am very new to Java.

As I suggested in my previous reply: int --> double and nextInt() --> nextDouble() or int --> float and nextInt() --> nextFloat().

kind regards,

Jos

ps. and please read the tutorials.

[teohzj123]

Hey thanks..Actually I already did what you asked too but it still didn't work.Then I changed this %d\n" to %.3f\n"..And it worked now..Any ideas why?

PS:I'm starting to read tutorials now :)

[JosAH]

Hey thanks..Actually I already did what you asked too but it still didn't work.Then I changed this %d\n" to %.3f\n"..And it worked now..Any ideas why?

PS:I'm starting to read tutorials now :)

Ah,yes, I didn't notice the format String; it needed to be changed as well (as you did). "%d" formats an int number while "%3f" formats a float (or double) number. You'll find all the details somewhere in the tutorials (and the API documentation); happy reading, you'll learn a lot from them.

kind regards,

Jos

[allaudin]

Cz "d" is for decimal integer and "f" is for float ... for more information visit : Formatting Numeric Print Output (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)