LetterNumber

LetterNumber["c"]

gives the position of the character c in the English alphabet.

LetterNumber["c",alpha]

gives the position of c in the alphabet specified by alpha.

LetterNumber["string",]

gives a list of the positions of characters in string.

Details

  • The character c can be either uppercase or lowercase.
  • An alphabet can be specified by the entity for a language or by its standard name.
  • If a character does not appear in the specified alphabet, LetterNumber gives 0.

Examples

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Basic Examples  (4)

The fourth letter in the English alphabet is d:

LetterNumber works the same with uppercase letters:

The third letter in the Greek alphabet is :

Find the position of a letter in the Russian alphabet:

Get positions of each of the letters in a string:

Properties & Relations  (3)

LetterNumber takes letters in the same order as Alphabet:

FromLetterNumber inverts the operation performed by LetterNumber:

LetterNumber gives the position of a character in an alphabet:

ToCharacterCode gives the integer code of a character in an encoding:

Possible Issues  (2)

LetterNumber by default assumes the English alphabet:

LetterNumber operates on strings, not symbol names:

Introduced in 2015
 (10.1)
 |
Updated in 2017
 (11.1)