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If-then-else flow diagram A nested if–then–else flow diagram. In computer science, conditionals (that is, conditional statements, conditional expressions and conditional constructs) are programming language constructs that perform different computations or actions or return different values depending on the value of a Boolean expression, called a condition.
The convention when dealing with the dangling else is to attach the else to the nearby if statement, [2] allowing for unambiguous context-free grammars, in particular. Programming languages like Pascal, [ 3 ] C, [ 4 ] and Java [ 5 ] follow this convention, so there is no ambiguity in the semantics of the language , though the use of a parser ...
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H1, for example, is the program counter. The SYMB field of H1 is the name of the current instruction. However, H1 is interpreted as a list; the LINK of H1 is, in modern terms, a pointer to the beginning of the call stack. For example, subroutine calls push the SYMB of H1 onto this stack. H2 is the free-list.
The following example defines a procedure that applies a function (specified as a parameter) to each element of an array: PROC apply = (REF [] REAL a, PROC (REAL) REAL f): FOR i FROM LWB a TO UPB a DO a[i] := f(a[i]) OD. This simplicity of code was unachievable in ALGOL 68's predecessor ALGOL 60.
The code example above shows how the compiler can statically address the reliability of whether some_attribute will be attached or detached at the point it is used. Notably, the attached keyword allows for an "attachment local" (e.g. l_attribute ), which is scoped to only the block of code enclosed by the if-statement construct.
This is an example of mathematical jargon (although, as noted above, if is more often used than iff in statements of definition). The elements of X are all and only the elements of Y means: "For any z in the domain of discourse , z is in X if and only if z is in Y ."
Some parts of the standard library are covered by specifications—for example, the Web Server Gateway Interface (WSGI) implementation wsgiref follows PEP 333 [133] —but most are specified by their code, internal documentation, and test suites. However, because most of the standard library is cross-platform Python code, only a few modules ...