In computer science, a value is a sequence of bits that is interpreted according to some data type. It is possible for the same sequence of bits to have different values, depending on the type used to interpret its meaning. For instance, the value could be an integer or floating point value, or a string. Computer science, or computing science, is the study of the theoretical foundations of information and computation and their implementation and application in computer systems. ... A data type is a constraint placed upon the interpretation of data in a type system in computer programming. ... The integers are commonly denoted by the above symbol. ... A floating-point number is a digital representation for a number in a certain subset of the rational numbers, and is often used to approximate an arbitrary real number on a computer. ... In computer programming and formal language theory, (and other branches of mathematics), a string is an ordered sequence of symbols. ...

Some kinds of value are common to most programming languages (e.g., various kinds of number representations), while others are less commonly supported (e.g., Pascal supports a set type). A programming language is an artificial language that can be used to control the behavior of a machine, particularly a computer. ... Wikibooks has a book on the topic of Pascal Pascal is an imperative computer programming language, developed in 1970 by Niklaus Wirth as a language particularly suitable for structured programming. ...

In C: L-value and R-value

Some languages use the idea of L-value and R-value. L-values are values that have addresses, meaning they are variables or dereferenced references to a certain place. R-value is either L-value or non-L-value — a term only used to distinguish from L-value. In C, the term l-value originally meant something that could be assigned (coming from left-value, indicating it was on the left side of the = operator), but since 'const' was added to the language, this now is termed a 'modifiable L-value'. In computer science, a memory address is a unique identifier for a memory location at which a CPU or other device can store a piece of data for later retrieval. ...

An L-value is an expression that designates (refers to) an object. A non-modifiable L-value is addressable, but not assignable. A modifiable L-value allows the designated object to be changed as well as examined. An R-value is any expression that is not an L-value, it refers to a data value that is stored at some address in memory.

In assembly language

A value can be virtually any kind of data by a given data type, for instance a string, a digit, a single letter.

In assembly language there is something known as "immediate value", sometimes "immediate" for short; The value comes with the instruction; occasionally it can be written as "imm#" where # is a number indicating the size of the immediate value, so imm8 would refer to an immediate byte size value. An immediate value is a number, either written with digits or as a string" "mnemonic 'A'" could be the same as "mnemonic 0x64"; the byte order of strings differs depending on the assembler and architecture. When integers or any other data are represented with multiple bytes, there is no unique way of ordering of those bytes in memory or in a transmission over some medium, and so the order is subject to arbitrary convention. ...

External links

• Value Object
• Transfer Object Pattern