How can I transform a value like OxFF to short and long types. is there a standard function for this use?
JavaScript only knows about numbers which are floats.
You can use parseInt to parse that string into an integer.
It really is going to be a float but without a fraction.
Either pass the radix 16 or let JavaScript autodetect it:
parseInt("0xFF", 16)
parseInt("0xFF")
http://jsfiddle.net/bikeshedder/wVRh2/
Related
JavaScript converts all the big numbers into scientific notation.
eg: '90938498237058927340892374089' this string when converted to an integer will come out like this scientific notation '9.093849823705893e+28'.
How can I convert the data type from String to an Integer and avoiding the scientific notation?
In JS all the numbers are treated as floating-point so in end, they end up with precision you can use try BigInt('90938498237058927340892374089') which will give you exact number from string to number.
apart from this, you can also have a look here Javascript - parse string to long
this link might be helpful for you.
Try to use BigInt type:
BigInt('90938498237058927340892374089');
It returns BigInt number with 'n'-literal:
90938498237058927340892374089n
I need a way to convert a letter into a number and then be able to convert a number into binary. Does anyone know how to do this?
To convert a character into it's ASCII representation, use charCodeAt(0). For example:
'a'.charCodeAt(0); // 97
To convert a decimal number into a binary number, use toString(2). For example:
(122).toString(2); // "1111010"
This method has some issues dealing with negative numbers though. let me know if you will be dealing with them.
Like this:
parseInt("12").toString(2)
Result:
"1100"
I tried with the example value x = 123,i want two precision. So, i use x.toFixed(2). Then i will get the output "123.00"
but i want the output as 123.00 which is floating number with decimals.
var x = 123
x.toFixed(2);
output: "123.00"
expected: 123.00
A floating point notation or decimal number is not something explicitly declared. When the decimal point has nothing after the point, i.e., .0 It becomes an integer.
The .toFixed() is just for aesthetic purposes only. It also helps you to rounds off to the number of decimals too.
2.50000 and 2.5 are the exact same number. If you want to keep trailing zeroes, you'll have to use a string.
When I try to do this on my Chrome Console:
You can see that even when you do a strict type-checking, the decimals are considered like comments by the JavaScript parser. It might be a bit unclear to understand for developers coming from statically typed or strongly typed languages like Java & C#, where you can have separate float and double types.
Related: JavaScript - Keep trailing zeroes.
0xc4115 0x4cf8
Im not sure what data type this is so my question would be:
What data type is this and how can I convert it to something more manageable using NODE.JS?
you can convert Hexadecimal to Decimal by this
let hex_num = "0xc4115";
console.log(Number(hex_num)); #803093
In general you have the format 0x for hexadecimal, 0b for binary and 0 for octal. All this represent Numbers. JavaScript converts to decimal all of this types automatically. In case you want to do it yourself, you can use parseInt(number,base).
I am working on a calculator in javascript, where user can enter the values in textfield and operation will be performed.
Now if user enters a very large value
for example 5345345345353453453453535
it is converted to 5.345345345353453e+24
I am using parsrInt() to convert it to integers. and it gives me 5.
which is wrong .
Can anybody suggest how to solve it?
Integers in javascript are, like every numbers, stored as IEEE754 double precision floats.
So you can only exactly store integers up to 2^51 (the size of the mantissa).
This means you'll have to design another format for dealing with big integers, or to use an existing library like BigInteger.js (Google will suggest a few other ones).
Taken from Mozilla documentation:
Parses a string argument and returns an integer of the specified radix
or base.
Therefore parseInt() is taking your value as a string 5.345345345353453e+24
It is then ignoring any non-integer values and classing this as a decimal (5.345...) and then evaluating this to 5.
As #dystroy has pointed out, if you wish to carry out calculations with these large numbers you'll need to use a custom format, or use a pre-existing javascript library.
Try parseFloat instead of parseInt.
<script type="text/javascript">
var value = parseFloat(5345345345353453453453535);
alert(value);
</script>