In computer programming, a program exhibits undefined behavior (UB) when it contains, or is executing code for which its programming language specification...

Indeterminate form, in calculus Undefined behavior, computer code whose behavior is not specified under certain conditions Undefined value, a condition where...

integer by casting then dereferencing the pointer to it is not valid (undefined behavior). This can be avoided by using alternative type punning techniques...

multiplication by four. Shifts can result in implementation-defined behavior or undefined behavior, so care must be taken when using them. The result of shifting...

It might do both at different times; or the comparison might be undefined behavior. Also, in languages offering such support, the correct use depends...

unspecified, and undefined behavior. The exact definition of unspecified behavior varies. In C++, it is defined as "behavior, for a well-formed program...

the function is entered. The following expression, for example, has undefined behavior: printf("%s %s\n", argv[i = 0], argv[++i]); The C programming language...

In mathematics, the term undefined refers to a value, function, or other expression that cannot be assigned a meaning within a specific formal system...

standards specify that a C or C++ program containing a data race has undefined behavior. A race condition can be difficult to reproduce and debug because...

memory allocation. Dereferencing a null pointer, which results in undefined behavior, will usually cause a segmentation fault. This is because a null pointer...

catastrophic undefined behavior if they share state. This situation can arise in parallel computations, causing race conditions, but undefined behavior can also...

y to 10, and does not result in undefined behavior. let z = unsafe { x.baz }; // This results in undefined behavior, as the value stored in x is not...

returned when the return statement is omitted, while in JavaScript the value undefined is returned. In Windows PowerShell all evaluated expressions which are...

signed integer overflow causes undefined behavior. Run-time overflow detection implementation UBSan (undefined behavior sanitizer) is available for C compilers...

object is accessed by an independent pointer, this will result in undefined behavior. If the compiler knows that there is only one pointer to a memory...

C++, some constructs are specified to have undefined behavior. A compiler is free to implement any behavior or none, and typically an optimizing compiler...

between the format specifiers and count and type of values results in undefined behavior and possibly program crash or other vulnerability. The format string...

compilers, it has generated some debate regarding whether this is undefined behavior according to the C standard, since it appears to involve a dereference...

strcpy(str, input); // Copy input. // ... } The function will result in undefined behavior when the input is over 1000 characters. Some programmers may not feel...

NULL: int *ptr = NULL; Dereferencing a null pointer in C produces undefined behavior, which could be catastrophic. However, most implementations[citation...

value results in undefined behavior. For example, when shifting a 32 bit unsigned integer, a shift amount of 32 or higher would be undefined. Example: If...

called.: §15.7.3  If that function is a pure virtual function, then undefined behavior occurs.: §13.4.6  This is true even if the class contains an implementation...

(computer programming) Don't-care term Sequence point Side-channel attack Undefined behaviour Unspecified behaviour Frame problem Spuler, David A.; Sajeev...

value of a numeric data type (often a floating-point number) which is undefined as a number, such as the result of 0/0. Systematic use of NaNs was introduced...

try { typeid(*p); // Not undefined behavior; throws std::bad_typeid. } catch (...) { } Person& p_ref = *p; // Undefined behavior: dereferencing null typeid(p_ref);...

race conditions and deadlocks (ThreadSanitizer), to detect undefined behavior (UndefinedBehaviorSanitizer), to detect memory leaks (LeakSanitizer), or to...

value, without checking if the allocation is successful, invokes undefined behavior. This usually leads to crash (due to the resulting segmentation fault...

expression 0 0 {\displaystyle {\tfrac {0}{0}}} is also undefined. Calculus studies the behavior of functions in the limit as their input tends to some...

translation or execution. In some cases, such programs may exhibit undefined behavior. Even when a program is well-defined within a language, it may still...

operations should be performed. Such expressions generally invoke undefined behavior, and should be avoided. In languages with typed pointers like C, the...