Undefined behavior information

In computer programming, undefined behavior (UB) is the result of executing a program whose behavior is prescribed to be unpredictable, in the language...

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

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

integer by casting then dereferencing the pointer to it is not valid (undefined behavior). Another way would be to place the floating point value in an anonymous...

example, has undefined behavior: printf("%s %s\n", argv[i = 0], argv[++i]); An aspect of the C standard (not unique to C) is that the behavior of certain...

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...

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...

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

that may be the case in practice. Dereferencing a null pointer is undefined behavior in C, and a conforming implementation is allowed to assume that any...

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

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

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...

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

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...

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...

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

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...

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

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

executing f() concurrently do not result in a data race, which has undefined behavior in C and C++. The following C++ functions are impure as they lack...

explosion Polyvariance Rice's theorem Runtime verification Safety and liveness Undefined behavior Semantics Analyses Formal methods Category Outline Glossary...

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

set (otherwise the read has unspecified behavior). The same is syntactically valid but has undefined behavior in C++, however, where only the last-written...

the network with pages already loaded into its web browser, causing undefined behavior (for example, corrupt messages appear) when such a page tries HTTP...

sanitizer is a programming tool that detects bugs in the form of undefined or suspicious behavior by a compiler inserting instrumentation code at runtime. The...