ASCII vs. UTF-8 vs. UTF-16 vs. UTF-32

#1

Post by moutansos » Tue, Jun 13, 2023, 1:46 PM UTC

ASCII vs. UTF-8 vs. UTF-16 vs. UTF-32
benbrougher.tech

Re: ASCII vs. UTF-8 vs. UTF-16 vs. UTF-32

#2

Post by tsukikage » Tue, Jun 13, 2023, 2:12 PM UTC

"IBM z/OS on mainframes used a character set called EBCDI"

"Each ASCII character is 8 bits wide, or one byte. The result of this means that if each bit is either a 1 or a 0 that there are only 128 possible combinations"

"it uses two chunks of 2 bytes, instead of 4-byte chunks in UTF-8"

Re: ASCII vs. UTF-8 vs. UTF-16 vs. UTF-32

#3

Post by chaimanmeow » Tue, Jun 13, 2023, 2:13 PM UTC

does ascii have one of the bits reserved for parity check? This part confuses me:

"Each ASCII character is 8 bits wide, or one byte. The result of this means that if each bit is either a 1 or a 0 that there are only 128 possible combinations of ASCII characters."

If all 8 bits are used for data there should be 255 possible combinations.

Re: ASCII vs. UTF-8 vs. UTF-16 vs. UTF-32

#4

Post by beardyw » Tue, Jun 13, 2023, 2:40 PM UTC

chaimanmeow wrote: post #3

does ascii have one of the bits reserved for parity check? This part confuses me: "Each ASCII character is 8 bits wide, or one byte. The result of this means that if each bit is either a 1 or a 0 that there are only 128 possible combinations of ASCII characters." If all 8 bits are used for data there should be 255 possible combinations.

I thought ASCII only used 7 bits for the basic set, which would be 128. The remaining 128 seems to be used for special or language specific characters, but varies somehow.

Re: ASCII vs. UTF-8 vs. UTF-16 vs. UTF-32

#5

Post by mikecoles » Tue, Jun 13, 2023, 2:47 PM UTC

beardyw wrote: post #4

chaimanmeow wrote: post #3

does ascii have one of the bits reserved for parity check? This part confuses me: "Each ASCII character is 8 bits wide, or one byte. The result of this means that if each bit is either a 1 or a 0 that there are only 128 possible combinations of ASCII characters." If all 8 bits are used for data there should be 255 possible combinations.

I thought ASCII only used 7 bits for the basic set, which would be 128. The remaining 128 seems to be used for special or language specific characters, but varies somehow.

I'm uncertain, but you may be remembering 'code pages'.

From the site below, you can click different code pages to see the changes in extended ascii.

https://www.ascii-codes.com/

Re: ASCII vs. UTF-8 vs. UTF-16 vs. UTF-32

#6

Post by [deleted] » Tue, Jun 13, 2023, 8:58 PM UTC

beardyw wrote: post #4

chaimanmeow wrote: post #3

does ascii have one of the bits reserved for parity check? This part confuses me: "Each ASCII character is 8 bits wide, or one byte. The result of this means that if each bit is either a 1 or a 0 that there are only 128 possible combinations of ASCII characters." If all 8 bits are used for data there should be 255 possible combinations.

I thought ASCII only used 7 bits for the basic set, which would be 128. The remaining 128 seems to be used for special or language specific characters, but varies somehow.

[deleted]