correct value Undefined variable Undefined, a function or variable lacking a declaration Undefined, a variable lacking initialization Undefined, an unavailable...
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An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been declared by that code. In some...
4 KB (430 words) - 20:31, 16 February 2024
In computer programming, undefined behavior (UB) is the result of executing a program whose behavior is prescribed to be unpredictable, in the language...
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usually treat undefined values explicitly when possible. For instance, Perl has undef operator which can "assign" such value to a variable. In other type...
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Lovelace defines a hitherto undefined variable ( V 13 {\displaystyle V_{13}} ) by itself, thereby assuming that all undefined variables are automatically equal...
20 KB (2,712 words) - 22:34, 30 June 2024
Declaration (computer programming) (redirect from Variable declaration)
(identifier's) meaning. Declarations are most commonly used for functions, variables, constants, and classes, but can also be used for other entities such...
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the special \nnn octal notation supported, see %$CLS%. While the variable is undefined by default under DOS Plus and DR-DOS, the Multiuser DOS default...
101 KB (10,235 words) - 16:18, 19 August 2024
often has an undefined, arbitrary value if accessed (see wild pointer), since it has yet to be explicitly given a particular value. A variable whose extent...
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is undefined. The answer that it must be 10 assumes that it started at zero, which may or may not be true. Note that in the example, the variable i is...
8 KB (1,099 words) - 20:53, 22 February 2023
is reported to the user as an undefined variable. This has the pleasant side effect of checking for undefined variables with essentially no CPU overhead...
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first line were omitted, the program would trigger an error on the undefined variable p during compilation. However, the program would still be syntactically...
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values at the last exit, while the values of declared variables that are not marked with own is undefined. — Revised report on ALGOL 60, section "5. Declarations"...
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Scope (computer science) (redirect from Dynamic variable scoping)
which is known as variable hoisting. Behavior of names in context that have undefined value differs: in Python use of undefined names yields a runtime...
76 KB (10,513 words) - 09:42, 15 August 2024
required every time an undefined value is dereferenced. Perl autovivification allows a programmer to refer to a structured variable, and arbitrary sub-elements...
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prevent more serious problems. For example, when encountering an undefined variable, MUMPS generates an error where MIIS treats it as nil. In the 1980s...
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random variables, one can show that both E[X +] = ∞ and E[X −] = ∞ (see Harmonic series). Hence, in this case the expectation of X is undefined. Similarly...
52 KB (7,602 words) - 15:54, 23 July 2024
JavaScript syntax (redirect from Variable hoisting)
forward reference is not possible. With var a variable's value is undefined until it is initialized. Variables declared with let or const cannot be accessed...
86 KB (10,279 words) - 02:26, 20 July 2024
results are not trustworthy. Using aqueous electrodes introduces undefined, variable, and unmeasurable junction potentials to the cell in the form of...
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automatic variables.) All variables declared within a block of code are automatic by default. An uninitialized automatic variable has an undefined value until...
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Cauchy distribution (redirect from Cauchy Random Variable)
"pathological" distribution since both its expected value and its variance are undefined (but see § Moments below). The Cauchy distribution does not have finite...
45 KB (6,843 words) - 22:08, 3 August 2024
Stable distribution (redirect from Stable random variable)
Cauchy distribution. The distributions have undefined variance for α < 2 {\displaystyle \alpha <2} , and undefined mean for α ≤ 1 {\displaystyle \alpha \leq...
45 KB (6,723 words) - 17:13, 25 August 2024
Immutable object (redirect from Mutable variable)
programming, values held in program variables whose content never changes are known as constants to differentiate them from variables that could be altered during...
33 KB (3,757 words) - 22:30, 16 April 2024
and HTML elements in the Document Object Model (DOM). When an undefined JavaScript variable is declared in the same context as an HTML element with the...
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expectation of a circularly symmetric complex random variable can only be either zero or undefined. Additionally, E [ Z Z ] = E [ e i ϕ Z e i ϕ Z ]...
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Bihar. Falling Rain Genomics. Retrieved 10 March 2009. " Notice: Undefined variable: Post in /Opt/Lampp/Htdocs/Zhouyong/Icas.co.in/List.PHP on line 29...
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value of the expression may be undefined. Thus an expression represents an operation over constants and free variables and whose output is the resulting...
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Don't-care term (redirect from Vacuous variable)
Incomplete opcode decoding Logic redundancy Undefined behaviour Undefined variable Uninitialized variable Four-valued logic Nine-valued logic Examples...
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Convex function (redirect from Convex function (of a complex variable))
would be undefined (because the multiplications 0 ⋅ ∞ {\displaystyle 0\cdot \infty } and 0 ⋅ ( − ∞ ) {\displaystyle 0\cdot (-\infty )} are undefined). The...
35 KB (5,850 words) - 04:14, 7 June 2024
Sonepat : A PHP Error was encountered Severity: Notice Message: Undefined variable: meta_title Filename: views/default_template.php Line Number: 12 Backtrace:...
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Pointer (computer programming) (redirect from Pointer variable)
I do consider assignment statements and pointer variables to be among computer science's "most valuable treasures." Donald Knuth, Structured Programming...
73 KB (9,782 words) - 23:19, 3 June 2024