MullOverThings

Useful tips for everyday

How do you represent a number in bytes?

How do you represent a number in bytes?

A byte is not just 8 values between 0 and 1, but 256 (28) different combinations (rather permutations) ranging from 00000000 via e.g. 01010101 to 11111111 . Thus, one byte can represent a decimal number between 0(00) and 255.

How many bytes is a number?

Whole numbers (integers) are usually represented with 4 bytes, or 32 bits. In the past, symbols (e.g., letters, digits) were represented with one byte (8 bits), with each symbol being mapped to a number between 0-255. The ASCII table provides the mapping. Here’s an on-line binary-decimal converter.

Can you convert int to byte?

To convert an int back to a byte, just use a cast: (byte)someInt . The resulting narrowing primitive conversion will discard all but the last 8 bits. Also, bear in mind that you can’t use byte type, doing so will result in a signed value as mentioned by other answerers.

What is a byte example?

For numeric data, one byte holds one decimal digit (0-9), two “packed decimal” digits (00-99) or a binary number from 0 to 255. An example of a byte is combination of bits used in computer coding to represent a letter in an alphabet.

How many numbers can you represent with 2 bytes?

2 bytes would be 4 decimal digits and you could represent values between 0 up to 10000 (not included).

How much can a byte store?

Eight bits are called a byte. One byte character sets can contain 256 characters.

Is byte a class?

Byte class is a wrapper class for the primitive type byte which contains several methods to effectively deal with a byte value like converting it to a string representation, and vice-versa. An object of Byte class can hold a single byte value. Byte class offers four constants in the form of Fields.

Why do we use bytes?

A byte is the unit most computers use to represent a character such as a letter, number or typographic symbol. Each byte can hold a string of bits that need to be used in a larger unit for application purposes. As an example, a stream of bits can constitute a visual image for a program that displays images.

How many numbers can be represented by a byte?

A byte is not just 8 values between 0 and 1, but 256 (2 8) different combinations (rather permutations) ranging from 00000000 via e.g. 01010101 to 11111111. Thus, one byte can represent a decimal number between 0 (00) and 255. Puzzled?

How many bytes does it take to send a text message?

Text uses a lot of bytes. Unicode defines more than 128000 characters, so that would take 3 bytes per character! There are rarely good reasons to use text instead of numbers, apart from maybe transmitting some user input.

How to send a byte through serial port?

The Write method you are using sends a string to the serial port, so your code is converting the hex expression to a number and then converting the number to a string and sending 3 characters. If you want to send the value 234 as a single byte value then use the byte array oveload of the Write method. See:

How to send 16 bit and 32 bit numbers?

Then we shift it 8 bits to the left so that it is in the correct place and add in the least significant bit by or-ing it with b. Here are the master and slave code for sending 16 bit and 32 bit numbers. Note that I’m using int16_t and int32_t to be as explicit as possible.