What is implementation defined behavior?
Implementation-defined behavior gives an implementor the freedom to choose the appropriate approach, but requires that this choice be explained to the user. Behaviors designated as implementation-defined are generally those in which a user could make meaningful coding decisions based on the implementation definition.
What is the difference between undefined and unspecified?
Unspecified behavior is different from undefined behavior. The latter is typically a result of an erroneous program construct or data, and no requirements are placed on the translation or execution of such constructs.
What is undefined Behaviour in CPP?
When we run a code, sometimes we see absurd results instead of expected output. So, in C/C++ programming, undefined behavior means when the program fails to compile, or it may execute incorrectly, either crashes or generates incorrect results, or when it may fortuitously do exactly what the programmer intended.
What happens undefined behavior?
In computer programming, undefined behavior (UB) is the result of executing a program whose behavior is prescribed to be unpredictable, in the language specification to which the computer code adheres.
What is implementation-defined in C?
Implementation-deﬁned behavior is defined by the ISO C Standard in section 3.4.1 as: unspeciﬁed behavior where each implementation documents how the choice is made. EXAMPLE An example of implementation-deﬁned behavior is the propagation of the high-order bit when a signed integer is shifted right.
What is implementation dependent in C?
Implementation dependent means that the standard says nothing about some occurance in C/C++ and leaves the choice up to the people who create compilers and operating systems.
What is implementation defined in C?
Is stack overflow undefined behavior?
Most languages have a terrible stack overflow story. For example, in C, if you use too much stack, your program will exhibit “undefined behavior”, which if you are lucky means that it will crash.
Why does undefined behavior exist?
Undefined behavior exists mainly to give the compiler freedom to optimize. One thing it allows the compiler to do, for example, is to operate under the assumption that certain things can’t happen (without having to first prove that they can’t happen, which would often be very difficult or impossible).
What does implement a plan mean?
Implementation is by definition, the act of carrying out or executing a plan, process or method. It’s the action that must follow any thinking on a review or set of recommendations to ensure it happens.
What is implementation dependent?
It means that what you use on one system/compiler may not work the same way on another, but the behavior is well defined for that particular implementation. For example, whether the result of a right bitwise shift on a signed variable results in a logical or arithmetic shift is implementation defined.
What does implementation mean in C?
The C standard defines an “implementation” to be a “particular set of software, running in a particular translation environment under particular control options, that performs translation of programs for, and supports execution of functions in, a particular execution environment” (C 2011 [N1570] 3.12).
How are defined benefit pension plans funded?
Defined contribution plans are funded primarily by the employee, where the participant defers a portion of their gross salary and the company matches the contribution. Employers guarantee a specific retirement benefit amount for each participant of a defined benefit pension plan.
What is the difference between implementation-defined and unspecified?
The difference between implementation-defined and unspecified, is that the compiler is supposed to pick a behavior in the first case but it doesn’t have to in the second case. For example, an implementation must have one and only one definition of sizeof (int).
What is the difference between a corporate pension plan and defined-contribution?
A corporate pension plan is an employee benefit that provides regular income after retirement, based on length of service to the company and salary history. A defined-contribution plan is a retirement savings plan in which a certain amount of money is set aside by enrolled employees and/or their employers.
What is the difference between implementation defined behavior and undefined behavior?
The only difference between Implementation-Defined Behavior and Undefined Behavior is that the former requires that implementations define and document a consistent behavior even in cases where nothing the implementation could possibly do would be useful.