literal (redirected from erratum)

literal

In programming, any data typed in by the programmer that remains unchanged when translated into machine language. Examples are a constant value used for calculation purposes as well as text messages displayed on screen. In the following lines of code, the literals are 1 and VALUE IS ONE.

     if x = 1
       print "the value is one"
     endif

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literal

1. Maths containing or using coefficients and constants represented by letters: ax² + b is a literal expression

2. Publishing a misprint or misspelling in a text

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(programming)

literal - A constant made available to a process, by inclusion in the executable text. Most modern systems do not allow texts to modify themselves during execution, so literals are indeed constant; their value is written at compile-time and is read-only at run time. In contrast, values placed in variables or files and accessed by the process via a symbolic name, can be changed during execution. This may be an asset. For example, messages can be given in a choice of languages by placing the translation in a file. Literals are used when such modification is not desired. The name of the file mentioned above (not its content), or a physical constant such as 3.14159, might be coded as a literal. Literals can be accessed quickly, a potential advantage of their use.