# How to calculate the ascii code value of a letter

### About the calculation of ascii code. How to calculate

This is a hexadecimal ascii code, if you give the known condition that the ascii code of H is 48 because J and H are two digits apart, so the ascii code of J is 48+2=40A.

It is the most common standard for exchanging information and is equivalent to the international standard ISO/IEC646.The first time that ASCII was published in the form of a specification standard was in 1967. ASCII was first published in 1967 and last updated in 1986, defining a total of 128 characters to date.

Extended Information

ASCII uses a specified combination of 7- or 8-bit binary numbers to represent 128 or 256 possible characters. Standard ASCII is also called base ASCII.

The 7-bit binary number (the remaining 1 bit of binary is 0) is used to represent all upper- and lower-case letters, the numbers 0 through 9, punctuation, and special control characters used in American English.

### How is the ascii code calculated?

①The ASCII codes for uppercase characters A to Z are 065 to 090, character plus one, code plus one

②The ASCII codes for lowercase characters a to z are 097 to 122, still character plus one, code plus one

The following chart shows the ASCII code correspondences for common characters

Extended Information

32 to 126 (total 95) are characters (32 is a space), of which 48 to 57 are the ten Arabic numerals from 0 to 9.

65 to 90 are 26 uppercase letters of the alphabet, 97 to 122 are 26 lowercase letters of the alphabet, and the rest are some punctuation marks, arithmetic symbols and so on.

Also note that in standard ASCII, the highest bit (b7) is used as the parity bit. The so-called parity check is a method used to check for errors in the code transmission process, and is generally divided into two types of checksums: odd and even.

Odd parity rule: the correct code in a byte of the number of 1 must be odd, if not odd, then in the highest bit b7 add 1; even parity rule: the correct code in a byte of the number of 1 must be even, if not even, then in the highest bit b7 add 1.

### How do you calculate the ASCII value of the capital letter B?

The ASCII code value for the capital letter A is 65, and B is next to A, which is 66.

ASCII (AmericanStandardCodeforInformationInterchange) is a set of computer codes based on the Latin alphabet system based on the Latin alphabet, which is mainly used to display modern English and other Western European languages. It is the most common single-byte coding system in use today, and is equivalent to the international standard ISO/IEC646.

Size rules:

ASCII code for numbers < ASCII code for uppercase letters < ASCII code for lowercase letters.

Query ASCII techniques to facilitate the query ASCII code corresponding to the character: a new text document, hold down ALT + to query the code value (note that here is the decimal), and release to show the corresponding character. For example: hold down ALT + 97, it will show ‘a’.