How do I convert a string to a double, a number loses the precision

I tried converting a string to a double but that limits the precision. I need to convert a string to a double.

If you use the Scan From String function, the default is to convert to a dbl. If you're looking at a front panel indicator, don't confuse the format and precision of the indicator with the type representation. You can set the indicator to display as many digits as you want but that doesn't change the actal number stored in memory.

Similar Messages

How do you convert this String into a double?

Hi, in this code I want to convert String arg into a double. I'm trying to do this so that I can convert some string into a double in this calculator that I'm making. Here is the code:
public class par {
public static void main(String[] args) {
String str = "351";
double arg = new double(str); // should convert the string into a double
System.out.println(arg);
System.out.println(str);
I keep getting errors in line 4, if any of you could help me out here I'll be thankful, i'm kinda new to java and my search for java's equivalent of alof() (its a function in C libraries that converts char[] into a double)lead me to this.
Tony L.

Use the Following:
String num = "123.2";
double d = Double.parseDouble(num);

How do I convert a String to a DateTime in SQL ??

I have retreived the current date and time and place into String data type. but my table colmun is in datetime data type.
How do I convert ??
Thanks in advance.

I have retreived the current date and time and place
into String data type. but my table colmun is in
datetime data type.
take a look at the SimpleDateFormat class...
http://java.sun.com/j2se/1.3/docs/api/java/text/SimpleDateFormat.html
basically something like this...
SimpleDateFormat sdf = new SimpleDateFormat();
java.util.Date dt = sdf.parse(dateAsString);
java.sql.Timestamp ts= new java.sql.Timestamp(dt.getTime());anyway it can handle different formats and i believe you can create your own if you need to.
ps this question would have been better posted in the JDBC forum.

How can I convert a string to a seperated characters?

How can I convert a string to a separated characters without using array?
such as: input = String "word"
output =
w
o
r
d
Thanks

A string is stored internally in individual characters.
The String class has a method 'charAt(int index)' which returns the character at that index so using a for loop..
String s = "word";
for(int counter=0; counter < s.length(); counter++)
System.out.println(s.charAt(counter));
HTH

How do I convert a powerpoint document to a pdf and retain the notes?

How do I convert a powerpoint document to a pdf and retain the notes?

One possibility is to print the slides+notes, choosing "save as PDF" in the print dialog instead of sending it to a printer.

Converting a String to a Double, may I use Double constructor?

Hello,
I need to convert A String to a Double in my application.
Usually I use the Double.parseDouble(String) method that works fine.
But I have found one line in the code that use the Double class constructor: new Double(String). It has been observed that that constructor sometimes throws NullPointerException.
My question is, are theses two methods both good practices to do the convertion? Could threre be a multi-threading problem with the Double construtor?
I'm using JDK 1.3.1.
Here is a sample of stack trace:
bvsmgr: java.lang.NullPointerException
     at java.lang.FloatingDecimal.readJavaFormatString(Unknown Source)
     at java.lang.Double.valueOf(Unknown Source)
     at java.lang.Double.<init>(Unknown Source)
Thank you for all answers,
Florent.

But I have found one line in the code that use the
Double class constructor: new Double(String).
It has been observed that that constructor sometimes
throws NullPointerException.
My question is, are theses two methods both good
practices to do the convertion? Could threre be a
multi-threading problem with the Double construtor?Both methods are the same (they both use valueOf()), and if the c'tor throws an NPE, then only because you feed it null. parseDouble would do that, too.

Having trouble converting a string to a double

Im having problems converting a string to a double in my jsp pages, i have pasted part of the code that is causing the problem. Just a note, i have imported the java.lang.* classes also
while ( rs.next() )
String price = rs.getString("price");
sPrice = double.parseDouble(price);
out.println("<TD>$" + decimalFormat.format(sPrice) + " </TD>");
An error occurred at line: 140 in the jsp file: /cs399/AddToShoppingCart.jsp
Generated servlet error:
[javac] Compiling 1 source file
C:\jakarta-tomcat-4.1.29\work\Standalone\localhost\_\cs399\AddToShoppingCart_jsp.java:277: class expected
sPrice = double.parseDouble("price");
^

double is a primitive. You want java.lang.Double, with a capital "D":
sPrice = Double.parseDouble(price);MOD

How can I convert a String into an int?

I need to use command-line args. So I enter "java Main 123" and I want to use 123 not as a String but as an int.
How can I convert it into an int?
Thank You!!
Sprocket

Example method (you don't need to use a method unless you do this a lot)
private int stringTOInt (String aString)
int result = 0;
try
result = Integer.parseString(aString);
catch (Exception ex)
System.out.println ("Failed to convert string " + aString + " to int.");
return result;
}

How do I convert a string into a decimal

I've been tryin to convert a string into decimal but I can't get it to work at all. I keep getting an exception.
I've tried all of these:
double myDouble = Double.valueOf(string).doubleValue();
int myint = Interger.parseInt(string);
float myfloat = Float.parseFloat(string);
I can't get anything to work.
That string i'm reading in is an array containing values with decimals. ex: -45.09348
All the above work fine if there is no decimal, but fails when it comes to one.
How do I go about doing this?
Thanks!

This works for me:String s = "-45.6789";
double d = Double.parseDouble(s);
System.out.println(d);Mark

How do I convert a string, and use a string as a property?

I have an array in the following format:
{ownsCar: 'true', ownsBike: 'true', ownsHouse: 'true'}
{ownsCar: 'false', ownsBike: 'true', ownsHouse: 'true'}
{ownsCar: 'true', ownsBike: 'false', ownsHouse: 'true'}
etc ............
And I need to test against each item e.g.
if...
myDataGrid[myItem].ownsCar == Object(myCheckbox).label
... then
if...
myDataGrid[myItem].ownsBike == Object(myCheckbox).label
... then
if...
myDataGrid[myItem].ownsHouse == Object(myCheckbox).label
... then
But I need to build my application where the property (e.g. "ownsCar", "ownsBike", "ownsHouse") is a variable such as:
if...
myDataGrid[myItem].myProperty == Object(myCheckbox).label
... then
I would like to loop through my Array, counting the number of items, and then use each item as a property.
How would I convert the string (e.g. "ownsCar") into a property "myProperty" ???
Many thanks in advance
Chris

Thanks, but my problem is that I won't know what my property will be.
E.g. they could be...
{svnsdkvnsdklvnsdklv: 'true', seuAfnwfnw: 'true', asfwseionf: 'true', etc.................}
and there could be lots of them.
I need to have myObject[N], where N is a variable property for each of the items taken from a variable length array
so...
ownsCar is represented by myObject.[N]
ownsHouse is represented by myObject.[N+1]
ownsBike is represented by myObject.[N+2]
etc
(sorry, this is so difficult to explain when I dont know what the answer is)

How do I convert a String to double~?

The contents of a file named data.txt are shown below:
1.2402 .7930 .3254 -.0994 -.2930 -.4233 -.4539 -.1423
-.0007 -.3118 -.6208 -.9524 -1.3694 -1.3870 -.9214 -.3621
.1633 .9746 2.0815 2.5352 1.8879 1.0037 .3276 -.2085
I want to read these data from data.txt.
Below are the code I use to read file:
//read file
BufferedReader br = new BufferedReader(objFileReader);
//lstrLine contains one line data,
String strLine = br.readLine();
Question:How can I convert String strLine to double [ ] dbLine ?
For example,convert String strLine=" 1.2402 .7930 .3254 -.0994 -.2930 -.4233 -.4539 -.1423" to dbLine[0]=1.2402,dbLine[1]=.7930,dbLine[2]=.3254,dbLine[3]=-.0994,dbLine[4]=-.2930,dbLine[5]=-.4233,dbLine[6]=-.4539,dbLine[7]=-.1423

String.split(), DecimalFormat

How to convert a String data to Double or Float???? Thank you

I need to convert String data to Double or Float , please help me about it. Thank you very muh!
String a=Integer.parseInt("1234"); convert to integer.

I found it but do not know if it is ok
float a= Float.valueof(String to
convert).floatValue();
may be it can be!!!
Thank you !!!!How did parseInt lead you do valueOf?
Look for something more consistent. A pattern.As I said earlier, it depends if he wants an object or a primitive.
� {�

How do I convert a string to a value in a formula

I'm working on a home budget and I've imported my bank records. The records are apparently in a "string" format.
I ultimately want to convert column D to positive integers and use those elsewhere. Simply creating a column that times the values by -1 should work. However I can't use this column in a formula because it contains a string.
Copying a pasting the values still doesn't rid the string error message. In fact, in the new mavericks version, the option to "paste formula results" isn't an option: it's grey.
Any help?

try (just for fun) changing the "," to a "." (period)
I think you localization (on your computer) doesn't match the localization of the values in column D
Numbers automatically justifies an entry based on whe it thinks about the entry.
In the example, above, I entered the text:
"-123,45" in cell B14. Numbers believes it is text and left justifies it.
"-123.45" in cell B15. Numbers believes it is a number and right justifies it.
Since all your entries are left justified Numbers thinks they are text and are, therefore, NOT valid numbers.

How can I convert a string of hex values to a hex format string programatically?

Is there a way to convert a string of the following format:
1400010107070D0305006A01 ........ ("Normal display" string)
programatically to:
1400 0101 0707 0D03 05006A01 .......... ("Hex display" striing)
I need to do this in order to calculate a CRC16 value.
See attached VIs
Thank you.
Solved!
Go to Solution.
Attachments:
CMM_SN_MULTI.vi ‏50 KB
CMM_CRC16_Calculator.vi ‏23 KB

You can iterate over the string and use the String to Hex VI. If you work with two bytes of the string at a time you can get a U8 array of the desired binary values. Then when you are complete you can either work with the byte array of convert it back to a string using Byte Array to String.
EDIT: GerdW typed faster than I did.
Message Edited by Mark Yedinak on 03-18-2010 02:55 PM
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

How can I convert a string into an image

I want to convert a string into an image.
I want to know required steps for that.

look at http://forum.java.sun.com/thread.jsp?forum=31&thread=194763
drawString looks as something you might need

How do I convert a string to a double, a number loses the precision

Similar Messages

Maybe you are looking for