why cfg is called context free?
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Context Free Grammars. ... Context-free grammars are named as such because any of the production rules in the grammar can be applied regardless of context—it does not depend on any other symbols that may or may not be around a given symbol that is having a rule applied to it.
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CFG is a configuration file format used for storing settings. CFG files are created by many programs to store information and settings that differ from the factory defaults. CFG files usually appear as text documents, and can be opened by word processors though it is not recommended.
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Braces { } not required for one statement (but are always good) If the true or false clause of an if statement has only one statement, you do not need to use braces (also called "curly brackets"). This braceless style is dangerous, and most style guides recommend always using them.
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Ambiguous grammars are undesirable because the derivation tree provides considerable information about the semantics of a program; conflicting derivation trees provide conflicting information. Ambiguity is a property of a grammar, and it is usually (but not always) possible to find an equivalent unambiguous grammar.
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The difference is that #define is processed by the preprocessor doing what amounts to simple text replacement. Const values defined like this are not visible for the actual compiler, while a variable defined with the const modifier is an actual typed "variable" (well not really that variable).
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['Click the Windows "Start" button. ... ', 'Right-click the "CFG" file displayed in the results window. ... ', 'View the file and edit any configurations you want to edit.']
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Type-1 grammars generate context-sensitive languages. These grammars have rules of the form with a nonterminal and , and strings of terminals and/or nonterminals. The strings and may be empty, but must be nonempty. The rule is allowed if.
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It is not a bad practice, it just means that you did not think your code through. The condition is required to tell the loop when to finish looping.
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Because PHP checks the type of variables at runtime, it is often described as a dynamically typed language. A statically typed language on the other hand, will have all its type checks done before the code is executed.
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['Unclosed quotes.', 'Missing or Extra parentheses.', 'Unclosed braces.', 'Missing semicolon.']
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If several references point to same String without even knowing it, it would be bad if one of the references modified that String value. That's why String objects are immutable.
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Trigger Context Variables. All triggers define implicit variables that allow developers to access run-time context. These variables are contained in the System. ... Returns true if the current context for the Apex code is a trigger, not a Visualforce page, a Web service, or an executeanonymous() API call.
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The main difference between regular expression and context free grammar is that the regular expressions help to describe all the strings of a regular language while the context free grammar helps to define all possible strings of a context free language.
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3 Answers. If you use #ifdef syntax, remove the brackets. The difference between the two is that #ifdef can only use a single condition, while #if defined(NAME) can do compound conditionals.
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C (/siː/, as in the letter c) is a general-purpose, procedural computer programming language supporting structured programming, lexical variable scope, and recursion, with a static type system.
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In Compile time Polymorphism, the call is resolved by the compiler. In Run time Polymorphism, the call is not resolved by the compiler. It is also known as Static binding, Early binding and overloading as well. It is also known as Dynamic binding, Late binding and overriding as well.
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Class names are case insensitive, for declaration, instantiation, and static calls. Class methods, being functions, are case insensitive. Class properties, being variables & constants, are case sensitive.