Basic ascii code knowledge

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hello, i try to study bout ascii code today
i got some information from Lesson 6.6 : How numbers are encoded as characters in ASCII - YouTube[^]

i got some question about 'flag' in ascii

as what has been mention in this video the 1st 3 digits in ascii code

010 represent upper case char
011 represent lower case char

so in this example, i can assume that the 3rd flag will determine it is big capital or small capital letter

i try to google about how ascii code works
mostly i found they never explain about the 'flag'

can someone please make a simple explaination about how the 1st 3 digits work

thank you

What I have tried:

how actually an ascii code works

Posted 13-Jun-16 0:08am

rolandoelninoz

Updated 13-Jun-16 0:14am

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F-ES Sitecore · Accepted Answer · 2016-06-13T00:14:00

Solution 1

If you convert the ascii value for a letter into binary you'll see all the lower case ones start "011", so "a" is 01100001 and "z" is 01111010, and the upper case with "010" so "A" is 01000001 and "Z" is 01011010.

ASCII - Binary Character Table[^]

By "flag" they mean the position of one of the units (which can be 0 or 1). So third flag means the third digit from the left. A flag is anything that can be considered on or off, true or false etc.

Posted 13-Jun-16 0:14am

F-ES Sitecore

Updated 13-Jun-16 0:16am

v2

Comments

rolandoelninoz 13-Jun-16 6:23am

thank you sir for the explanation,
what about the 1st and 2nd flag, i mean how it works on ascii..

F-ES Sitecore 13-Jun-16 6:28am

They don't have any special significance, a to z is 97 to 133 (in decimal) and A to Z is 65 to 90, that's just their given values.

rolandoelninoz 13-Jun-16 6:30am

noted.. thanks.. :D