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  2. Value type and reference type - Wikipedia

    en.wikipedia.org/wiki/Value_type_and_reference_type

    Many languages have explicit pointers or references. Reference types differ from these in that the entities they refer to are always accessed via references; for example, whereas in C++ it's possible to have either a std:: string and a std:: string *, where the former is a mutable string and the latter is an explicit pointer to a mutable string (unless it's a null pointer), in Java it is only ...

  3. JavaScript syntax - Wikipedia

    en.wikipedia.org/wiki/JavaScript_syntax

    A snippet of JavaScript code with keywords highlighted in different colors. The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output.

  4. Primitive data type - Wikipedia

    en.wikipedia.org/wiki/Primitive_data_type

    Integer addition, for example, can be performed as a single machine instruction, and some offer specific instructions to process sequences of characters with a single instruction. [7] But the choice of primitive data type may affect performance, for example it is faster using SIMD operations and data types to operate on an array of floats.

  5. Type system - Wikipedia

    en.wikipedia.org/wiki/Type_system

    Intersection types are useful for describing overloaded function types: for example, if "intint" is the type of functions taking an integer argument and returning an integer, and "floatfloat" is the type of functions taking a float argument and returning a float, then the intersection of these two types can be used to describe ...

  6. Data type - Wikipedia

    en.wikipedia.org/wiki/Data_type

    The standard type hierarchy of Python 3. In computer science and computer programming, a data type (or simply type) is a collection or grouping of data values, usually specified by a set of possible values, a set of allowed operations on these values, and/or a representation of these values as machine types. [1]

  7. Naming convention (programming) - Wikipedia

    en.wikipedia.org/wiki/Naming_convention...

    The choice of a variable name should be mnemonic — that is, designed to indicate to the casual observer the intent of its use. One-character variable names should be avoided except for temporary "throwaway" variables. Common names for temporary variables are i, j, k, m, and n for integers; c, d, and e for characters. int i;

  8. const (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Const_(computer_programming)

    In the example above, if ptr references a global, local, or member variable declared as const, or an object allocated on the heap via new int const, the code is only correct if LibraryFunc really does not modify the value pointed to by ptr. The C language has a need of a loophole because a certain situation exists.

  9. Comparison of programming languages (basic instructions)

    en.wikipedia.org/wiki/Comparison_of_programming...

    The actual sizes of short int, int, and long int are available as the constants short max int, max int, and long max int etc. ^b Commonly used for characters. ^c The ALGOL 68, C and C++ languages do not specify the exact width of the integer types short , int , long , and ( C99 , C++11 ) long long , so they are implementation-dependent.