Convert from int to byte in JavaScript
I have a small piece of code in Java,
int x = 216;
System.out.println((byte)x);
I'd like to convert this to JavaScript form and that means, I want to be able to get the exact answer from this code which is -40. How do I do that?
What do you mean with
I'd like to convert this to JavaScript formThere is nothing like a JavaScript form.
Within a JSP page you can write
<script type="text/javascript">
alert("<%=String.valueOf((byte)216)%>");
</script>Which displays an alert box with the message "-40"
Similar Messages
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Hi, may i know how to convert from int to String??
For instance, i've>>
int i = 0;
i++;
String temp = i.toString();
[Need to convert the int to String here. Am i doing the convertion correctly?? Pls correct me. Thanks!]Hi, may i know how to convert from int to String??
For instance, i've>>
int i = 0;
i++;
String temp = i.toString();
[Need to convert the int to String here. Am i doing
the convertion correctly?? Pls correct me. Thanks!]String temp = "" + i; -
Hi,
How can I convert from an int to char?The challange is to convert from int to String without using any API or automatic conversionWoah, what a challenge ! Why ?
Anyway, what about a recursive call and switch statement. Something likepublic String intToString(int n) {
if(n<0) {
return "-"+intToString(-n);
if(n<10) {
return getStringDigit(n);
else {
return intToString(n/10) + getStringDigit(n%10);
private String getStringDigit(int n) {
switch(n) {
case 0:
return "0";
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} -
Converting from Int/Double to Wording Format
Hi,
Does anyone has any sample program to convert double values into wording (this functionality is used to convert currency value) up to Trillion value.
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I have written a program which can accept up to 1 Billion. This is because that 'int' can accept bits up to that level only. I am unsure how go beyond that because when I declare the type to double, the compiler gave me the same error.
Thank you.Check
http://www.rgagnon.com/javadetails/java-0426.html
but consider keeping locale specific texts in properties
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Uhh ... i am getting a stream of int from an InputStream and I want to display them as letters ... they are ASCII values ... can I do this ? feel dumb ...
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How to convert from int to string
Can anyone help me on how to convert int to string?
Thanks,
Qint i = 3
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i will be promoted to String automatically when the above expression is evaluated -
Converting from unsigned int / short to byte[]
Can anybody help me, I am trying to convert from:
- unsigned int to byte[]
- unsigned short to byte[]
I will appreciate your help lots. thanks.@Op.
This code converts an integer to a byte[], but you have to consider the byte order:
int value = 0x12345678;
byte[] result = new byte[4];
for (int i=3; i>=0; i--) {
result[i] = (byte)(value & 0xff);
value = value >> 8;
}This is another option:
int dummy = 7;
ByteArrayOutputStream os = new ByteArrayOutputStream();
os.write(dummy);
byte[] bytes = os.toByteArray();Kaj -
Trying to understand the details of converting an int to a byte[] and back
I found the following code to convert ints into bytes and wanted to understand it better:
public static final byte[] intToByteArray(int value) {
return new byte[]{
(byte)(value >>> 24), (byte)(value >> 16 & 0xff), (byte)(value >> 8 & 0xff), (byte)(value & 0xff) };
}I understand that an int requires 4 bytes and that each byte allows for a power of 8. But, sadly, I can't figure out how to directly translate the code above? Can someone recommend a site that explains the following:
1. >>> and >>
2. Oxff.
3. Masks vs. casts.
thanks so much.By the way, people often introduce this redundancy (as in your example above):
(byte)(i >> 8 & 0xFF)When this suffices:
(byte)(i >> 8)Since by [JLS 5.1.3|http://java.sun.com/docs/books/jls/third_edition/html/conversions.html#25363] :
A narrowing conversion of a signed integer to an integral type T simply discards all but the n lowest order bits, where n is the number of bits used to represent type T.Casting to a byte is merely keeping only the lower order 8 bits, and (anything & 0xFF) is simply clearing all but the lower order 8 bits. So it's redundant. Or I could just show you the more simple proof: try absolutely every value of int as an input and see if they ever differ:
public static void main(String[] args) {
for ( int i = Integer.MIN_VALUE;; i++ ) {
if ( i % 100000000 == 0 ) {
//report progress
System.out.println("i=" + i);
if ( (byte)(i >> 8 & 0xff) != (byte)(i >> 8) ) {
System.out.println("ANOMOLY: " + i);
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break;
}Needless to say, they don't ever differ. Where masking does matter is when you're widening (say from a byte to an int):
public static void main(String[] args) {
byte b = -1;
int i = b;
int j = b & 0xFF;
System.out.println("i: " + i + " j: " + j);
}That's because bytes are signed, and when you widen a signed negative integer to a wider integer, you get 1s in the higher bits, not 0s due to sign-extension. See [http://java.sun.com/docs/books/jls/third_edition/html/conversions.html#5.1.2]
Edited by: endasil on 3-Dec-2009 4:53 PM -
Hi,
I have a question.
How do I convert from String to Integer?
Here is my code:
try{
String s="000111010101001101101010";
int q=Integer.parseInt(s);
answerStr = String.valueOf(q);
catch (NumberFormatException e)
answerStr="Error";
but, everytime when i run the code, i always get the ERROR.
is the value that i got, cannot be converted to int?
i've done the same thing in c, and its working fine.
thanks..6kyAngel wrote:
actually it convert the string value into decimal value.In fact what it does is convert the (binary) string into an integer value. It's the String representation of integer quantities that have a base (two, ten, hex etc): the quantities themselves don't have a base.
To take an integer quantity (in the form of an int) and convert it to a binary String, use the handy toString() method in the Integer class - like your other conversion, use the one that takes a radix argument. -
How to convert an int number to a byte array, and how to convert back?
Hello, everybody,
Just as the topic, if I have an int number(which should have 32-bit, or 4-byte), how can I convert it into a byte array. And also, how to convert it back.
Thank you in advance!Alternatively you can use ByteBuffers to do this work for you
// to a Byte Array
int originalInt =...;
ByteBuffer myBuffer = ByteBuffer.allocate(4);
myBuffer.putInt( originalInt );
byte myArray[] = myBuffer.array();
// and back to an int
ByteBuffer myOtherBuffer = ByteBuffer.wrap(myArray);
int finalInt = myOtherBuffer.getInt(); -
Question on converting an int to 4 byte array
Hello all. I apologize in advance if this information is readily available, because I haven't been able to find a definitive answer to this question. I need to convert an int to a big endian 4 byte-array. I have the following code, which I'm fairly sure works, but it's the big endian part I'm not sure about. Can anyone confirm that this code snippet will do what I expect:
public static final byte[] intToByteArray(int value)
return new byte[]
(byte)(value & 0xff),
(byte)(value >> 8 & 0xff),
(byte)(value >> 16 & 0xff),
(byte)(value >>> 24) };
}Thank you very much in advance for your help.
-Kennedykook04 wrote:
Hello all. I apologize in advance if this information is readily available, because I haven't been able to find a definitive answer to this question. I need to convert an int to a big endian 4 byte-array. I have the following code, which I'm fairly sure works, but it's the big endian part I'm not sure about. Can anyone confirm that this code snippet will do what I expect:The best way is to test it for yourself.
int i = 0xAABBCCDD;
byte[] bytes = intToByteArray(i);
if (bytes[0] == (byte)0xAA && bytes[1] ... etc.) {
System.out.println("Success!");
else {
System.out.println("Oops!")
} -
Multiplatform: how convert int into byte[]???
Hi all,
I need to convert an int value into an array of bytes. An int is represented by 4 bytes, but the problem is that depending on the platform, the most significant byte is the first or the last, so if you convert it directly, like:
int i = 5;
byte b[] = new byte[4];
b[0] = (byte)( (i & 0xff000000) >>> 24);
b[1] = (byte)( (i & 0x00ff0000) >>> 16);
b[2] = (byte)( (i & 0x0000ff00) >>> 8);
b[3] = (byte)( (i & 0x000000ff) );
you cannot export it to another platfroms.
Thank you in advance.Come on, nobody knows how to detect the byte order in a given platform?
I've been all the day dealing with this, which means all day without producing.
Please, it�s very urgent.
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How to convert from java.lang.Integer to int
Could you please show me
how to convert from java.lang.Integer to int?
and how to convert from java.lang.Integer to String?
Thanks,
MinhCould you please show me
how to convert from java.lang.Integer to int?
and how to convert from java.lang.Integer to String?Tip: always keep a browser open on the API docs; if you've got a
couple of MBs to spare, download the docs; it's very convenient.
kind regards,
Jos -
Converting the sample model type from USHORT to BYTE
Hi,
We're converting TIFF images into JPEGs and loading them into a database. This works except for cases where the SampleModel datatype of the image is USHORT when it throws:
java.lang.RuntimeException: Only 1, or 3-band byte data may be written.
at com.sun.media.jai.codecimpl.JPEGImageEncoder.encode(JPEGImageEncoder.java:145)
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GDAL_INFO tool tells us the following about the image
C:\dmp>gdalinfo OsloQB1_1.tif
Driver: GTiff/GeoTIFF
Files: OsloQB1_1.tif
Size is 7847, 7768
Coordinate System is:
PROJCS["UTM 32 V E012",
GEOGCS["unnamed",
DATUM["unknown",
SPHEROID["unretrievable - using WGS84",6378137,298.257223563]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4030"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",9],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",500000],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]]]
Origin = (590809.199999999950000,6656298.599999999600000)
Pixel Size = (0.600000000000000,-0.600000000000000)
Metadata:
AREA_OR_POINT=Area
Corner Coordinates:
Upper Left ( 590809.200, 6656298.600) ( 10d37'47.39"E, 60d 2'1.81"N)
Lower Left ( 590809.200, 6651637.800) ( 10d37'39.98"E, 59d59'31.21"N)
Upper Right ( 595517.400, 6656298.600) ( 10d42'51.44"E, 60d 1'57.97"N)
Lower Right ( 595517.400, 6651637.800) ( 10d42'43.65"E, 59d59'27.37"N)
Center ( 593163.300, 6653968.200) ( 10d40'15.62"E, 60d 0'44.62"N)
Band 1 Block=7847x1 Type=UInt16, ColorInterp=Red
Band 2 Block=7847x1 Type=UInt16, ColorInterp=Green
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so how come the most significant bit is carrying 1 to represent negative value.bytes in java are signed -
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