What is the difference between unspecified and undefined?

Unspecified Behavior has a short description of it. To sum up, unspecified behavior is usually something you shouldn’t worry about, unless your software is required to be portable. Conversely, undefined behavior is always undesirable and should never occur.

How is implementation defined?

Implementation is the carrying out, execution, or practice of a plan, a method, or any design, idea, model, specification, standard or policy for doing something. As such, implementation is the action that must follow any preliminary thinking in order for something to actually happen.

What does implementation defined mean C++?

C and C++ distinguish implementation-defined behavior from unspecified behavior. For implementation-defined behavior, the implementation must choose a particular behavior and document it. The choice of behavior must be consistent with the documented behavior within a given execution of the program.

What is undefined behavior in programming?

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 undefined Behaviour C++?

Undefined behavior (often abbreviated UB) is the result of executing code whose behavior is not well defined by the C++ language. In this case, the C++ language doesn’t have any rules determining what happens if you use the value of a variable that has not been given a known value.

What is undefined behavior in terms of C language standard?

Undefined behavior is a term used in the C standard. The C11 standard (ISO/IEC 9899:2011) defines the term undefined behavior as. behavior, upon use of a nonportable or erroneous program construct or of erroneous data, for which this International Standard imposes no requirements.

What is implementation and why is it important?

Implementation is the process that turns strategies and plans into actions in order to accomplish strategic objectives and goals. Implementing your strategic plan is as important, or even more important, than your strategy.

Why does C++ have undefined behavior?

C and C++ have undefined behaviors because it allows compilers to avoid lots of checks. Suppose a set of code with a greater performing array need not keep a look at the bounds, which avoids the need for a complex optimization pass to check such conditions outside loops.

Does C initialize ints to 0?

Variables declared (as int )at file scope are initialized to 0.

Does Go have undefined behavior?

AFAIK, “undefined behaviour” is not a thing in Go The Language (there is some undefined behaviour in the Go The StdLib). The Go Specification[1] doesn’t even contain the word “undefined”, and only has two instances of “unspecified”. But so far the Go Team is very reluctant about adding immutability to the language.

What are the consequences of undefined behavior in C++?

When a C or C++ program triggers undefined behavior, anything is allowed to happen in the program execution. And by anything, I really mean anything: The program can crash with an error message, it can silently corrupt data, it can morph into a colorful video game, or it can even give the right result.

What’s the difference between implementation defined 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.

What’s the difference between unspecified and implementation defined?

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’s the difference between undefined and unspecified in C + +?

What is the difference between them? Undefined behavior is one of those aspects of the C and C++ language that can be surprising to programmers coming from other languages (other languages try to hide it better).

What are the results of an undefined behavior?

Each unspecified behavior results in one of a set of valid results. undefined behavior – there are no restrictions on the behavior of the program.