Convert Integer to Hex and Hex to Integer

Convert integer to hexadecimal and back again

// Store integer 182
int intValue = 182;
// Convert integer 182 as a hex in a string variable
string hexValue = intValue.ToString("X");
// Convert the hex string back to the number
int intAgain = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber);

from http://www.geekpedia.com/KB8_How-do-I-convert-from-decimal-to-hex-and-hex-to-decimal.html


HINT (from the comments):

Use .ToString("X4") to get exactly 4 digits with leading 0, or .ToString("x4") for lowercase hex numbers (likewise for more digits).

Convert integer to hex and hex to integer

Convert INT to hex:

SELECT CONVERT(VARBINARY(8), 16777215)

Convert hex to INT:

SELECT CONVERT(INT, 0xFFFFFF)

Update 2015-03-16

The above example has the limitation that it only works when the HEX value is given as an integer literal. For completeness, if the value to convert is a hexadecimal string (such as found in a varchar column) use:

-- If the '0x' marker is present:
SELECT CONVERT(INT, CONVERT(VARBINARY, '0x1FFFFF', 1))

-- If the '0x' marker is NOT present:
SELECT CONVERT(INT, CONVERT(VARBINARY, '1FFFFF', 2))

Note: The string must contain an even number of hex digits. An odd number of digits will yield an error.

More details can be found in the "Binary Styles" section of CAST and CONVERT (Transact-SQL). I believe SQL Server 2008 or later is required.

Java Convert integer to hex integer

public static int convert(int n) {
return Integer.valueOf(String.valueOf(n), 16);
}

public static void main(String[] args) {
System.out.println(convert(20)); // 32
System.out.println(convert(54)); // 84
}

That is, treat the original number as if it was in hexadecimal, and then convert to decimal.

How to convert decimal to hexadecimal in JavaScript

Convert a number to a hexadecimal string with:

hexString = yourNumber.toString(16);

And reverse the process with:

yourNumber = parseInt(hexString, 16);

Java converting int to hex and back again

It overflows, because the number is negative.

Try this and it will work:

int n = (int) Long.parseLong("ffff8000", 16);

Convert Java String hexadecimal number to int hexadecimal number

You don't need to convert it. There is no such thing as a hex number. A number written in hex is a number written in a base 16 notation. We normally use base 10 notation so we have digits from 0 to 9 but in hex notation you have digits from 0 to F.
So just do a and operation :

int offsetData = address & decimalShift;

EDIT:
To get only the lower 16 bit use a mask.
0xffff and perform a & operation the upper 16 bits will be set to 0 and the lower 16 will remain unchanged.
so:

int offsetData = address & decimalShift & 0xffff;

EDIT2:
To get a mask for any number(0,...,31) of bits you can use this function:

private static int getMask(int numOfOnes) {
int i = 0x80000000;
i = i>>(32-numOfOnes-1);
i = ~i;
return i;
}

Pauls explanation: "bitshifting with >> fills the most signifcant bits with the value of the MSB before shifting, so in this code all bits except for the numOfOnes lowest bits are filled with 1s and afterwards the number is inverted."

How to convert an int to a hex string?

You are looking for the chr function.

You seem to be mixing decimal representations of integers and hex representations of integers, so it's not entirely clear what you need. Based on the description you gave, I think one of these snippets shows what you want.

>>> chr(0x65) == '\x65'
True


>>> hex(65)
'0x41'
>>> chr(65) == '\x41'
True

Note that this is quite different from a string containing an integer as hex. If that is what you want, use the hex builtin.

android int to hex converting

Documentation says Integer.toHexString returns the hexadecimal representation of the int as an unsigned value.

I believe Integer.toString(value, 16) will accomplish what you want.

C# : Int to Hex Byte conversion to write into an Hex File

Your code is correct for converting an integer to hex.

The hex representation of 568 is 00 00 02 38 - so reversed for little Endian, you end up with what you got.

To get your desired output you need to view it, not as integer, but as an ASCII string. If you need to make sure the text input can be converted to an integer, you can do something like this:

if (int.TryParse(textEditValue.EditValue.ToString(), out int myInt)){
byte[] intBytes = Encoding.ASCII.GetBytes(textEditValue.EditValue.ToString());
Array.Reverse(intBytes); // Because the hex-file is little-endian
byte[] resultBytes = intBytes;
}
else {
//Not a valid integer
}


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