How do uppercase and lowercase letters differ by only one bit?

Posted by Vibhakar SInha on Stack Overflow See other posts from Stack Overflow or by Vibhakar SInha
Published on 2010-08-25T20:16:44Z Indexed on 2010/12/22 1:54 UTC
Read the original article Hit count: 510

Filed under:

ascii

|

bit-manipulation

|

case-sensitive

I have found one example in Data and Communication Networking book written by Behrouza Forouzan regarding upper- and lowercase letters which differ by only one bit in the 7 bit code.

For example, character A is 1000001 (0x41) and character a is 1100001 (0x61).The difference is in bit 6, which is 0 in uppercase letters and 1 in lowercase letters. If we know the code for one case, we can easily find the code for the other by adding or subtracting 32 in decimal, or we can just flip the sixth bit.

What does all this mean?

I have found myself very confused with all these things. Could someone provide examples of how these things really work out?

© Stack Overflow or respective owner

Related posts about ascii

Planning Database as a Service Implementation Project

as seen on Oracle Blogs - Search for 'Oracle Blogs'
People, process and planning are the three key elements to success in a private cloud journey. Some common questions i hear from field/customers often relates to tasks involved in setting up Database-as-a-Service(DBaaS) using Oracle Enterprise Manager 12c from scratch and how these tasks are mapped… >>> More
Getting less to stop highlighting non-ascii characters

as seen on Super User - Search for 'Super User'
I have some logs which I want to read in less. Unfortunately, scattered throughout the otherwise text file are some non-ascii characters that less displays as highlighted junk. This is really annoying. How do I get rid of the highlighting? >>> More
GNU Screen: using VT100 ASCII codes

as seen on Super User - Search for 'Super User'
I try to move with the VT100 keys here in GNU Screen: $ screen $ hello <left><left> ESC C ESC D but "ESC D" deletes until the end of line and ESC C does nothing. Perhaps, I am not using right VT100 emulation. How can I test it and how can I get the ASCII codes working from commandline… >>> More
String that contains all ascii characters

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I want to create a string in JavaScript that contains all ascii characters. How can I do this? >>> More
Are Extended ASCII characters safe for filenames & folders?

as seen on Stack Overflow - Search for 'Stack Overflow'
My C# project saves files and creates folders with the extended ASCII character "²" (superscript 2). Is this safe to work with internationally? Is this something that could cause any issues with the .NET libraries or Windows functions? >>> More

Related posts about bit-manipulation

Find three numbers appeared only once using bit manipulation

as seen on Stack Overflow - Search for 'Stack Overflow'
In a sequence of length n, where n=2k+3, that is there are k unique numbers appeared twice, how to find the three unique numbers that appeared only once using bit manipulation? for example, in sequence 1 1 2 6 3 6 5 7 7 the three unique numbers are 2 3 5. >>> More
Learning C bit manipulation

as seen on Stack Overflow - Search for 'Stack Overflow'
I didn't know any better name for a title of the question. For ex: on one of my previous questions one answered ((a)-(b))&0x80000000) 31 - this is kind of a too advanced for me and i can't really get what it means. I am not looking just for an answer of that, but i need someone to tell me some… >>> More
Bit manipulation, permutate bits

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi. I am trying to make a loop that loops through all different integers where exactly 10 of the last 40 bits are set high, the rest set low. The reason is that I have a map with 40 different values, and I want to sum all different ways ten of these values can be multiplied. (This is just out of… >>> More
bit manipulation in java

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a fragment of bytes in a byte[]. The total size of the array is 4 and I want to convert this into a positive long number. For example if the byte array is having four bytes 101, 110, 10, 1 then i want to get the long number represented by binary sequence 00000000 00000000 00000000 00000000… >>> More
Doing 64 bit manipulation using 32 bit data in Fixed point arithmetic using C.

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am stuck with a problem. I am working on a hardware which only does support 32 bit operations. sizeof(int64_t) is 4. Sizeof(int) is 4. and I am porting an application which assumes size of int64_t to be 8 bytes. The problem is it has this macro BIG_MULL(a,b) ( (int64_t)(a) *… >>> More