Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I need to convert decimal number stored in an int, to a array of bytes aka stored in a unsigned char array.
The question probably needs some clarification as others obviously understood you wanted the underlying bytes used in internal representation of int but if you want to do that kind of thing, you'd better use some fixed size type defined in instead of an int, or you won't know for sure the length of your byte array. This should be an endianness-agnostic conversion. It goes from low to high. There's probably a more efficient way to do it, but I can't think of it at the moment.
I'm posting this mostly because I don't see another solution here for which the results don't change depending on what endianness your processor is. Learn more. Convert int to array of bytes in C?
Ask Question. Asked 10 years, 2 months ago. Active 3 years, 9 months ago. Viewed 35k times. Any clues? Emi Emi 81 1 1 gold badge 1 1 silver badge 2 2 bronze badges. Active Oldest Votes. Warning: memcpy can produce unpredictable behavior if you don't account for endianness. Zarel The results will be entirely predictable, but perhaps unwanted. Zarel: if you care about endianness just call hton on your int before memcpy and you get a fixed order network order.
I understand the problem as converting a number to a string representation as Neil does. Below is a simple way to do it without using any lib. Warning: untested code.
But perhaps the user wants them to change - to maintain the same byte order as in the original int. Also, your array sizing and loop control calculation is wrong. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.
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I receive a port number as 2 bytes least significant byte first and I want to convert it into an integer so that I can work with it. I've made this:. I appreciate this has already been answered reasonably.Know your data type: int - C Programming Tutorial 08
However, another technique is to define a macro in your code eg:. Learn more. Convert 2 bytes into an integer Ask Question. Asked 7 years, 4 months ago. Active 8 months ago. Viewed 51k times. Any ideas? Dave Chen Active Oldest Votes. Joachim Isaksson Joachim Isaksson k 22 22 gold badges silver badges bronze badges.
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How do I convert a char to an int in C and C++?
Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.This example shows you how to use the BitConverter class to convert an array of bytes to an int and back to an array of bytes. You may have to convert from bytes to a built-in data type after you read bytes off the network, for example. In addition to the ToInt32 Byte, Int32 method in the example, the following table lists methods in the BitConverter class that convert bytes from an array of bytes to other built-in types.
This example initializes an array of bytes, reverses the array if the computer architecture is little-endian that is, the least significant byte is stored firstand then calls the ToInt32 Byte, Int32 method to convert four bytes in the array to an int.
The second argument to ToInt32 Byte, Int32 specifies the start index of the array of bytes. In this example, the GetBytes Int32 method of the BitConverter class is called to convert an int to an array of bytes.
Skip to main content. Contents Exit focus mode. Note The output may differ depending on the endianness of your computer's architecture. Is this page helpful? Yes No. Any additional feedback? Skip Submit.
I want to convert a byte 8 bit int to a string that's one character long. I need to do this because I want to send the byte value over serial to an Arduino.
I want to convert myByte into myString, such that if I did. See also: Convert. ToChar Method Byte. If so, you should protect yourself from unconvertible data. ASCII would replace unconvertible data with? In case it helps anyone else: I had to do something similar in a loop and had issues getting the resultant string to print. The answer was to use spender's solution from above, but wrapped to check for null bytes before adding to my string:.
Learn more. Asked 6 years, 7 months ago. Active 1 year, 9 months ago. Viewed 23k times. I am using C in Visual Studio I want to convert myByte into myString, such that if I did serialport1. Write myString ; It would function the same as serialport1. Write "1" ; Can anyone help me out? Stephen Kennedy Nimaid Nimaid 2 2 gold badges 3 3 silver badges 8 8 bronze badges.
I have a unsigned char array; filled with bytes. Is there a similiar Function in C? We know that, a 16 bit integer is just two 8 bit integers concatenated, i.
Note that there's a difference between the endian-ness in the stored integer and the endian-ness of the running architecture. The endian-ness referred to in this answer is of the stored integer, i. The solutions are independent of the endian-ness of the running architecture since endian-ness is taken care of when shifting. There's no standard function to do it for you in C. You'll have to assemble the bytes back into your and bit integers yourself. Be careful about endianness! Learn more.
Asked 8 years, 1 month ago. Active 1 year, 11 months ago. Viewed 76k times. Now I want to convert the bytes back to my uint16's and int32's. M k 17 17 gold badges silver badges bronze badges. Sam Sam 1 1 gold badge 1 1 silver badge 7 7 bronze badges. This site uses a Question and Answer format - please do not edit the question to contain answers. Also the answer that you had edited into the question was wrong anyway.
M Nov 10 '18 at Active Oldest Votes. Yes there is.
Shahbaz Shahbaz Also, try reading a little on binary numbers. What I am doing is simple multiplication. Imagine 0xFF. If you viewed as signed, it's So instead of adding toyou will be subtracting by 1, which is not what you would want. Carl Norum Carl Norum k 25 25 gold badges silver badges bronze badges.
As written above, they'll be cast to int s before doing the shifts, but int need not be 32 bits. That would be safest, agreed. Assuming bytes is native endian, what sort of alignment issues would you run into? Or, I guess, what kind of situations makes alignment a problem? Azmisov Alignment issues have nothing to do with endianness: Its just that usually an 32bit word usually needs to be aligbed at a 32bit- boundary, while a byte or Herr an arry of bytes That's why the C standard prohibits casting a pointer to a byte to a pointer to a word In case of little-endian, can't you just use memcpy?
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How to convert a byte array to an int (C# Programming Guide)
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