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In computer programming, an infinite loop (or endless loop) [1] [2] is a sequence of instructions that, as written, will continue endlessly, unless an external intervention occurs, such as turning off power via a switch or pulling a plug. It may be intentional.
a Eiffel supports a reserved word retry, however it is used in exception handling, not loop control. a Requires Java Modeling Language (JML) behavioral interface specification language. a Requires loop variants to be integers; transfinite variants are not supported. a D supports infinite collections, and the ability to iterate over those ...
The implementation of exception handling in programming languages typically involves a fair amount of support from both a code generator and the runtime system accompanying a compiler. (It was the addition of exception handling to C++ that ended the useful lifetime of the original C++ compiler, Cfront. [18]) Two schemes are most common.
In the Java programming language, ... All potentially dangerous code is placed inside the block and, if an exception occurred, is stopped, or caught. try ...
So dereferencing nil in these contexts will not cause an error, but poorly written code can get into an infinite loop. In .NET and C#, access to null reference (null) causes a NullReferenceException to be thrown. Although catching these is generally considered bad practice, this exception type can be caught and handled by the program.
The actual values are only computed when needed. For example, one could create a function that creates an infinite list (often called a stream) of Fibonacci numbers. The calculation of the n-th Fibonacci number would be merely the extraction of that element from the infinite list, forcing the evaluation of only the first n members of the list.
Some infinite loops can be quite useful. For instance, event loops are typically coded as infinite loops. [1] However, most subroutines are intended to finish. [2] In particular, in hard real-time computing, programmers attempt to write subroutines that are not only guaranteed to finish, but are also guaranteed to finish before a given deadline ...
A do-while loop provides for the action's ongoing execution until the condition is no longer true. It is possible and sometimes desirable for the condition to always evaluate to be true. This creates an infinite loop. When an infinite loop is created intentionally there is usually another control structure that allows termination of the loop.