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Conditional (computer programming) - Wikipedia If-then-else flow diagram A nested if–then–else flow diagram In computer programming, a conditional statement directs program control flow based on the value of a condition; a Boolean expression A conditional expression evaluates to a value without the side-effect of changing control flow Many programming languages (such as C) have distinct conditional statements and expressions In pure
Ternary conditional operator - Wikipedia The operator allows for initializing a variable via a single statement which otherwise might require multiple statements Use in variable assignment reduces the probability of a bug from a faulty assignment as the assigned variable is stated only once For example, in Python:
Python syntax and semantics - Wikipedia Python syntax and semantics A snippet of Python code demonstrating binary search The syntax of the Python programming language is the set of rules that defines how a Python program will be written and interpreted (by both the runtime system and by human readers) The Python language has many similarities to Perl, C, and Java
Boolean data type - Wikipedia In programming languages with a built-in Boolean data type, such as Pascal, C, Python or Java, the comparison operators such as > and ≠ are usually defined to return a Boolean value Conditional and iterative commands may be defined to test Boolean-valued expressions Languages with no explicit Boolean data type, like C90 and Lisp, may still represent truth values by some other data type
Dangling else - Wikipedia Dangling else The dangling else is a problem in programming of parser generators in which an optional else clause in an if–then (–else) statement can make nested conditional statements ambiguous Formally, the reference context-free grammar of the language is ambiguous, meaning there is more than one correct parse tree
Zen of Python - Wikipedia The official definition of "Pythonic" is: [2][e] An idea or piece of code which closely follows the most common idioms of the Python language, rather than implementing code using concepts common to other languages For example, a common idiom in Python is to loop over all elements of an iterable using a for statement
If and only if - Wikipedia Wherever logic is applied, especially in mathematical discussions, it has the same meaning as above: it is an abbreviation for if and only if, indicating that one statement is both necessary and sufficient for the other This is an example of mathematical jargon (although, as noted above, if is more often used than iff in statements of definition)
While loop - Wikipedia In computer programming, a while loop is a control flow statement that allows code to be executed repeatedly based on a Boolean condition The while loop can be thought of as a repeating if statement
Yoda conditions - Wikipedia In programming jargon, Yoda conditions (also called Yoda notation) is a programming style where the two parts of an expression are reversed from the typical order in a conditional statement A Yoda condition places the constant portion of the expression on the left side of the conditional statement