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Search references for NULL POINTER. Phrases containing NULL POINTER
See searches and references containing NULL POINTER!NULL POINTER
Value indicating that a referenced dataset is invalid or doesn't exist
In computing, a null pointer (sometimes shortened to nullptr or null) or null reference is a value indicating that the pointer or reference does not refer
Null_pointer
Computer fault caused by access to restricted memory
class of error in programs written in languages that support pointers that can be null, or that can be set to an arbitrary value, or that support arrays
Segmentation_fault
Topics referred to by the same term
representation Null device, a virtual file that discards data written to it, on Unix systems /dev/null Null pointer or reference (sometimes written NULL, nil,
Null
Object which stores memory addresses in a computer program
garbage collection. A null pointer has a value reserved for indicating that the pointer does not refer to a valid object. Null pointers are routinely used
Pointer (computer programming)
Pointer_(computer_programming)
Feature of object-oriented programming
null pointer to his design of the ALGOL W language and called it a "mistake": I call it my billion-dollar mistake. It was the invention of the null reference
Void_safety
Pointer that does not point to a valid object
system is able to detect run-time references to null pointers, a solution to the above is to assign 0 (null) to dp immediately before the inner block is
Dangling_pointer
General-purpose programming language
for null-terminated strings, with associated handling in its standard library. The language supports low-level access to computer memory via pointers, procedure-like
C_(programming_language)
Memory-safe dialect of the C programming language
following limits on programs: NULL checks are inserted to prevent segmentation faults Pointer arithmetic is limited Pointers must be initialized before use
Cyclone (programming language)
Cyclone_(programming_language)
Feature of some programming languages
pointers that can be NULL require the user to check the pointer before using it and require specific code to handle the case when the object pointer is
Nullable_type
In-band data value that must be handled specially by computer code
may make more sense to return a null pointer or null value, or when working with option types, return the none/null option. Some examples of common sentinel
Sentinel_value
2011 edition of the C++ programming language standard
never again be used, no code will try to access the null pointer, and because the pointer is null, its memory is not deleted when it goes out of scope
C++11
Control character with value 0
software documentation, the null character is often represented with the text NUL (or NULL although that may mean the null pointer). In Unicode, there is a
Null_character
Data types supported by the C programming language
concept of a null pointer to denote a pointer that does not refer to any valid data. The macro NULL is often used in place of a null pointer, relying on
C_data_types
Set of rules defining correctly structured programs for the Rust programming language
Though null pointers are idiomatically avoided, the null pointer constant in Rust is represented by std::ptr::null(). Rust also supports raw pointer types
Rust_syntax
Class of computer memory address reference
unusable. This means that, for example, a pointer to 0 is never a valid pointer and can be used as a special null pointer value. Unlike the previously mentioned
Tagged_pointer
Unpredictable result when running a program
Java_Crash_boom(JNIEnv* env, jclass cls) { int* p = NULL; return *p; // dereferencing a null pointer } On Java: package org.wikipedia.examples; public class
Undefined_behavior
Memory page starting at address zero
just the singular zero-valued null pointer, the Operating System can trap on code that, for example, has a null pointer pointing to a structure, and accesses
Zero_page
Object with no referenced value or with defined neutral ("null") behavior
is undefined behavior if a is a null pointer. The null object pattern solves this problem by providing a special NullAnimal class which can be instantiated
Null_object_pattern
Computer programming technique
can automatically detect such an invalid access (e.g. for the null value: a null pointer dereference error). This supports in analyzing the actual reason
Tombstone_(programming)
State of being protected from memory access bugs
destructor of an RAII object may lead to unexpected results. Null pointer dereference – A null pointer dereference will often cause an exception or program termination
Memory_safety
Deprecated class of smart pointers in C++
done with moves (and confusingly sets the copied-from auto_ptr to a null pointer). These copy semantics mean that it cannot be used in STL containers
Auto_ptr
Topics referred to by the same term
expression for rejecting all available candidates None, the keyword for the null pointer in Python Nones (disambiguation) Nothing (disambiguation) Zero (disambiguation)
None
null_pointer at SourceForge (9 June 2011). "srm main.c" (C Source). srm 1.2.11, main.c CVS 1.16. SourceForge.net. Retrieved 7 January 2014. doj, null_pointer
Srm_(Unix)
Standard macro in the C programming language
offsetof(st, m) \ ((size_t)&(((st*)0)->m)) This can be understood as taking a null pointer of type structure st, and then obtaining the address of member m within
Offsetof
Computer programming problem of nested checks
object-oriented programming languages when one of the objects may be a null pointer. Most modern object-oriented programming languages use method chaining
Pyramid_of_doom_(programming)
Data structure with nodes pointing to the next node
= NULL; // initialize invalid links to nil. if (!head) { head = temp; // If the linked list is empty (i.e., the head node pointer is a null pointer),
Linked_list
Execute a file (a library function and/or a system call)
passed as an array of pointers to null-terminated strings of form name=value. The final element of the array must be a null pointer. l – Command-line arguments
Exec_(system_call)
Computer programming paradigm
language or running environment), for example dereferencing a null pointer. As such, null pointer checks are unnecessary for the purpose of stopping the program
Offensive_programming
Error from a process accessing unmapped memory
termination of the code that made the invalid reference. A null pointer is usually represented as a pointer to address 0 in the address space; many operating systems
Page_fault
Dynamic memory management in the C programming language
Because malloc might not be able to service the request, it might return a null pointer and it is good programming practice to check for this: int* a = (int*)malloc(10
C_dynamic_memory_allocation
General-purpose programming language
bugs; Swift has features addressing some common programming errors like null pointer dereferencing and provides syntactic sugar to help avoid the pyramid
Swift_(programming_language)
Type qualifier denoting the data as being read-only
to data p = NULL; // OK: modifies the pointer *cp = 0; // Error! Cannot modify the pointed to data cp = NULL; // OK: modifies the pointer *pc = 0; //
Const
Numeric value with an unclear meaning
better. In C and C++, 0 is often used to mean null pointer even though the C standard library defines a macro NULL and modern C++ includes a keyword nullptr
Magic_number_(programming)
Type information inspection taking place at runtime
result of applying the unary * operator on a null pointer. Whether an exception is thrown for other null reference arguments is implementation-dependent
Run-time_type_information
Set of rules defining correctly structured C++ program
keyword, null literal or Boolean literal. The identifier nullptr is not a reserved word, but is a global constant that refers to a null pointer literal
C++_syntax
Implementation of the GNU toolchain for DOS
C/C++ compiler, it is not a zero-based flat model due to preferring NULL pointer protection for better stability. It is currently based upon a variant
DJGPP
Code section for declared statically-allocated variables
arithmetic types) or a null pointer (for pointer types). Implementations of C typically represent zero values and null pointer values using a bit pattern
.bss
Topics referred to by the same term
system Nil ideal, a mathematical concept in ring theory Null pointer (sometimes written NULL, nil, or None), used in computer programming for an uninitialized
Nil
Synchronization mechanism
structure, therefore avoiding inconsistencies (e.g., dereferencing null pointers). It is used when performance of reads is crucial and is an example
Read-copy-update
Whole number
way to refer to a null pointer in code. In databases, it is possible for a field not to have a value. It is then said to have a null value. For numeric
0
Automatic repair of software bugs
conditional statement to check whether the value of a variable is null to fix null pointer exception, or changing an integer constant by one to fix off-by-one
Automatic_bug_fixing
Unique string of length zero
programming languages, the empty string is distinct from a null reference (or null pointer) because a null reference points to no string at all, not even the
Empty_string
Type of software bug
memory: It is common to use pointers to access and modify memory. If such a pointer is a null pointer, dangling pointer (pointing to memory that has
Memory_corruption
Universal subtype in logic and computer science
natural type for the "null pointer" value (a pointer which does not point to any object) of languages like Java: in Java, the null type is the universal
Bottom_type
Programming language for JSON
types shown in the table below. null is a value, just like any other JSON scalar; it is not a pointer or a "null pointer". nan (corresponding to NaN) and
Jq_(programming_language)
Foreign function interface for the Java language
to capture machine (CPU/FPU) generated software interrupts (such as null pointer dereferences and divide-by-zero operations), and to handle these situations
Java_Native_Interface
Statement that a predicate is always true at that point in code execution
use ptr ... Here, the programmer is aware that malloc will return a NULL pointer if memory is not allocated. This is possible: the operating system does
Assertion (software development)
Assertion_(software_development)
Data type simulating a pointer with additional features
was Simula I. Insofar as Simula I's element is analogous to C++'s pointer without null, and insofar as Simula I's process with a dummy-statement as its
Smart_pointer
Data having only values "true" or "false"
condition-testing statements (if, while) assume that zero (and hence a NULL pointer or a null string terminator '\0' also) is false and all other values are true
Boolean_data_type
C programming language standard, current revision
decimal floating-point arithmetic (see "other" group). Add nullptr_t, a null pointer type. Add _BitInt(N) and unsigned _BitInt(N) types for bit-precise integers
C23_(C_standard_revision)
other words, a pointer is not NULL by default, it must be set in the code. Pointer arithmetic is not supported. DECL myptr PTR TO INT INIT NULL; DECL mydata
Protel
Computer program variable of undefined value
If any of these pointers are NULL, return -1. if (!output || !first_name || !last_name) { fprintf(stderr, "Error! Some parameter is NULL.\n"); return -1;
Uninitialized_variable
Where all data references are valid
allows them to add foreign key constraints on a table. Null pointer dereferencing Dangling pointer Data integrity Domain/key normal form Entity integrity
Referential_integrity
C programming language standard draft planned for release in 2029
Atomic Alignment Requirements". N3322 - "Allow Zero Length operations on Null Pointers (Including in the Library)". N3323 - "How Do You Add One To Something
C29_(C_standard_revision)
In computing, a condition where an expression does not have a correct value
concept of a null pointer distinct from any valid pointer, and often used as an error return. Some languages allow most types to be nullable, for example
Undefined_value
Thread safe Map collections for concurrency in Java
to: if (k == null || v == null) { throw new NullPointerException(); } if (m.containsKey(k)) { return m.put(k, v); } else { return null; } m.replace(k
Java_ConcurrentMap
Object-oriented programming language
are still in use. If methods for a non-existent object are called, a null pointer exception is thrown. One of the ideas behind Java's automatic memory
Java_(programming_language)
Computer programming style
always desirable. String myString = null; if (myString.equals("foobar")) { /* ... */ } // This causes a NullPointerException in Java With Yoda conditions
Yoda_conditions
Classes of data types
a mutable string and the latter is an explicit pointer to a mutable string (unless it is a null pointer), in Java it is only possible to have a StringBuilder
Value_type_and_reference_type
Programming language construct
illustrated in the following C snippet where minimal evaluation prevents both null pointer dereference and excess memory fetches: bool isFirstCharValidAlphaUnsafe(const
Short-circuit_evaluation
C++ programming technique
type Foobar defined, the instantiation of the first test works and the null pointer constant is successfully passed. (And the resulting type of the expression
Substitution failure is not an error
Substitution_failure_is_not_an_error
General-purpose programming language
still being simple and generic. They do not have to be used to solve null pointer problems; they are also useful for any type of value where "no value"
Zig_(programming_language)
Topics referred to by the same term
Agriculture for Natural Resources and Environment or USA(NRE) Null Reference Exception (Null_pointer#Null_dereferencing) This disambiguation page lists articles
NRE
Open-source system for transforming C code
pieces of code that are erroneous with high probability such as possible NULL pointer dereference) without transforming them. Therefore coccinelle's role is
Coccinelle_(software)
Anomaly in computer security and programming
function pointer or exception handler to point to the shellcode, which is subsequently executed; By overwriting a local variable (or pointer) of a different
Buffer_overflow
Programming language
to the fields a and b in the record, and to initialise the pointer c to the null pointer ("NIL" in Pascal), the statements would be: new(NodePtr); .
Pascal_(programming_language)
Header file for C programs
scalar type. Two common uses of the assert macro are to assert that a pointer is not null and to ensure that an array index is in-bounds. Below is a program
Assert.h
Tree data structure in which each node has at most m children
sequence of a m-ary tree cannot exceed the total number of null pointers (i.e., pointers without any child node attached to them). This summation is
M-ary_tree
Input which activates otherwise hidden functionality
bills. The issue stems from these systems confusing their name for a null pointer. Depending on the system, this may cause the system to not show their
Magic_string
Tool to detect memory-related bugs
return *ptr; // BOOM } null-dereference.c:4:10: runtime error: load of null pointer of type 'const char' Segmentation fault (core dumped) Intel MPX The Application
Code_sanitizer
engineering team at Facebook with open-source contributors. Targets null pointers, leaks, API usage and other lint checks. Available as open source on
List of tools for static code analysis
List_of_tools_for_static_code_analysis
Boolean operator
var _bar: String as Bar } var foo: Foo = null // the below will evaluate to null and not return a NullPointerException var bar = foo.Bar Safe navigation
Safe_navigation_operator
Data structure
computer programming, a null-terminated string is a character string stored as an array containing the characters and terminated with a null character (a character
Null-terminated_string
Form of source code, without regard to meaning
semantically defined (because p is a null pointer, the operations p->real and p->im have no meaning): complex *p = NULL; complex abs_p = sqrt (p->real * p->real
Syntax (programming languages)
Syntax_(programming_languages)
Edge case where the signalling of failure is ambiguous
a crash when the invalid pointer is used. Whether a pointer is null or not is another example of the predicate problem; null may be a flag indicating
Semipredicate_problem
a null reference. 5 TypeName will return the name of the class of the object contained. The data would be an interface pointer, that is, a pointer to
Variant_type_(COM)
Return code in the SQL standard
number SQL/MED HV009 X HV FDW-specific condition 009 invalid use of null pointer SQL/MED HV00A X HV FDW-specific condition 00A invalid string format SQL/MED
SQLSTATE
Input/output functionality in the C programming language
header include: FILE – also known as a file handle or a FILE pointer, this is an opaque pointer containing the information about a file or text stream needed
C_file_input/output
Concept in computer science
is checking that a reference about to be processed is not null, which avoids null-pointer failures. Other uses include using a Boolean field for idempotence
Guard_(computer_science)
Binary tree variant
right child pointers that would normally be null point to the in-order successor of the node (if it exists), and all left child pointers that would normally
Threaded_binary_tree
Implementation of SSL and TLS protocols
server and renegotiates with an invalid signature algorithms extension, a null-pointer dereference occurs. This can cause a DoS attack against the server. A
OpenSSL
C++ programming keywords for dynamic memory allocation
new(std::nothrow), which specifies that no exception should be thrown; instead, a null pointer is returned to signal an allocation error. The new operator can be overloaded
New_and_delete_(C++)
Return type for functions that do not output values when called
void. There is no native void in Rust, as it uses the unit type (). Null pointer Ritchie, Dennis M. (1993). "The Development of the C Language". Association
Void_type
Opaque data type which stores a memory address
that it may be desirable for the functions to check that the passed pointer is not NULL, but such checks have been omitted above for brevity. In Foo.cppm:
Opaque_pointer
Memory debugger program
sources of fatal errors, such as a program crash due to dereferencing a null pointer, but do not help to detect the non-fatal memory errors. Debuggers are
PurifyPlus
Static code analysis tool
Spencer are among the reported users of Infer. Infer performs checks for null pointer exceptions, resource leaks, annotation reachability, missing lock guards
Infer_Static_Analyzer
Java compiler in GCC with direct C++ interop support
(not java::lang::Class*). The Java null was originally translated to the older C++ NULL (however the null pointer constant nullptr may be substituted
GNU_Compiler_for_Java
Statically typed functional programming language
handling Immutable objects Algebraic data types Pattern matching No null pointers No implicit type conversions A "Hello, World!" example: import gleam/io
Gleam_(programming_language)
Punctuation mark (!)
"!!" ("double-bang") is the not-null assertion operator, used to override null safety so as to allow a null pointer exception. In the ML programming
Exclamation_mark
Software verification method
Memory leaks Security attack vulnerabilities (e.g., SQL injection) Null pointers Uninitialized memory Buffer overflows Runtime error detection tools
Runtime_error_detection
Fixing defects in an engineered system
computation. Those techniques can be tailored for specific bugs, such as null pointer dereferences. Shotgun debugging: a process of attempting to correct a
Debugging
Functional programming language
Rather than allow any value to be implicitly nullable (such as JavaScript's undefined or a null pointer), Elm's standard library defines a Maybe a type
Elm_(programming_language)
File archiver
Android versions are not affected. 6.24 (2023-10): Fixes an issue with null pointers. 7.00 (2024-02): drops support for creating RAR 4.x format archives
WinRAR
Language for controlling a computer
type and p->im is not defined because the value of p is the null pointer): complex *p = NULL; complex abs_p = sqrt(*p >> 4 + p->im); If the type declaration
Programming_language
Form of balanced tree
Similarly, the successor can be found by going right once and left until a null pointer is found. Because of the AA property of all nodes of level greater than
AA_tree
Free and open-source Unix-like operating system
panic if corruption of internal data structures is detected (e.g. kernel NULL pointer dereference). NetBSD also supports a variety of in-kernel bug detection
NetBSD
Use of functions that call themselves
is empty (root node is Null). In the case of a perfect binary tree of height h, there are 2h+1−1 nodes and 2h+1 Null pointers as children (2 for each
Recursion_(computer_science)
Topics referred to by the same term
Norton Power Eraser, a tool that scans a computer system for threats Null pointer exception, a form of run-time error in many programming languages National
NPE
Header file for C programs
example, if the expected type is int*, then a null pointer should be passed as (int*)NULL. Writing just NULL would result in an argument of type either int
Stdarg.h
Rules defining correctly structured Java programs
(obj == null) { // Throws exception of NullPointerException type throw new NullPointerException(); } // Will not be called, if object is null
Java_syntax
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NULL POINTER
NULL POINTER
Girl/Female
Greek American English French
Shining light. The bright one.
Surname or Lastname
English
English : nickname for a strong, aggressive, bull-like man, from Middle English bul(l)e, bol(l)e. Occasionally, the name may denote a keeper of a bull. Compare Bulman.German (mainly northern) : from a byname for a cattle breeder, keeper, or dealer. Compare South German Ochs.South German : nickname for a short fat man, a variant of Bolle, or a nickname for a man with the physical characteristics of a bull.
Girl/Female
American, Australian, British, Danish, English, French, German, Greek, Irish, Swedish
Shining Light; Light; The Light of the Sun from Eleanor and Variation of Helen; Sun Ray; Stone; Champion; Horn; Torch; Moon; Moon Elope
Girl/Female
Afghan, Australian, Danish, Swedish
God
Surname or Lastname
English
English : nickname from Middle English gulle ‘gull’ or gul(le) (Old Norse gulr) ‘yellow’, ‘pale’ (of hair or complexion).Swiss German : nickname for an irascible or unreliable person, from an Alemannic form of Latin gallus ‘rooster’. See also Guell.
Male
English
Medieval pet form of English Oliver, probably NOLL means "elf army."
Girl/Female
Arabic
Arabian Jasmine
Boy/Male
Hindu
Battle maiden
Boy/Male
Shakespearean
Love's Labours Lost' A constable.
Surname or Lastname
English
English : unexplained.Possibly a shortened form of any of several German compound surnames formed with Full- or Füll-.
Surname or Lastname
English
English : variant of Hill 1.English : from a pet form of Hugh.
Boy/Male
Celtic
Champion.
Female
English
Pet form of English Eleanor, NELL means "foreign; the other."
Surname or Lastname
English
English : from an Old English personal name, Lulla.German (Lüll) : from a short form of any of the Germanic personal names formed with liut- ‘people’ as the first element.Catalan (also Llull) : from the personal name Lullus, probably of Germanic origin.
Surname or Lastname
English
English : of uncertain origin, possibly from an unrecorded late survival of the Old English personal name Tula.South German (Tüll) : from a nickname for someone who was patient, from Middle High German dult ‘patience’; or from a personal name formed with the same word; or from Middle High German tult, dult ‘fair’, ‘festival’ (Bavarian Dult).South German : nickname for a stubborn man, Tull.Altered spelling of German Toll.
Surname or Lastname
English
English : from the Old English personal name Cula.Americanized spelling of German and Swedish Kall or German Koll.
Surname or Lastname
Dutch and German
Dutch and German : from the personal name Nel, a reduced form of Cornelius.South German : nickname from Middle High German nelle ‘crown of the head’, perhaps denoting an obstinate person.English : from the Middle English personal name Nel(le), a variant of Neill.
Male
Hungarian
Hungarian form of Greek Emmanouel, EMÃNUEL means "God is with us."
Boy/Male
British, English
Grinder
Boy/Male
British, English, Spanish
Strong Leader; Empty
NULL POINTER
NULL POINTER
NULL POINTER
NULL POINTER
NULL POINTER
NULL POINTER
NULL POINTER
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