which statements are true about constant pointers

The type of a pointer constant is address. Removing a co-author when re-submitting a manuscript. Found insideThe const Modifier and Pointers The use of the const modifier with pointer declarations can be confusing, because it can mean one of two ... You can remember the difference by reading from right to left, as indicated in the comments. You can decode the C declarator syntax using the clockwise/spiral rule. Asking for help, clarification, or responding to other answers. This means that you have to initialize the array and cannot later change … What is the base data type of a pointer variable by which the memory would be allocated to it? But that doesn't mean that the value of the array (which consists of the values of its elements) is read-only, any more than any other object is necessarily read-only. Please welcome Valued Associates: #958 - V2Blast & #959 - SpencerG. How to answer this interview test about constant pointers? The const and volatile keywords change how pointers are treated. The questions asked in this NET practice paper are from various previous year papers. Find centralized, trusted content and collaborate around the technologies you use most. Pointer constants cannot be saved. will increment the integer value being pointed by pointer p (but because p is assigned NULL, it will be undefined behaviour). Found inside – Page 184Following points are avenues for improvements in the repair algorithm; Erroneous constant values in a statement could be corrected by parameterizing them to find correct replacements but avoiding the abstraction step. Pointers contain address locations of variables. A function cannot have a parameter of array type. 2:The expression num [1] designates the very first element in the array. This is clearly different from the case when we have the const qualifier as explained above. 1:The array int num [26]; can store 26 elements. True b. now. Smallest element of an array is called as _______. 4:The declaration num [SIZE] is allowed if SIZE is a macro. Airline messed up my upcoming connection, travel agent wants to charge fees for rebooking. QUESTION 35 Which statement about pointers is false? matthewlongo24. Found inside – Page 410For example, consider these statements. const int i=20; const int* const ptr=&i; //constant pointer to a constant ... When a pointer is passed to a function, the address (not the value) of the actual argument is copied into the formal ... By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. q is a pointer to a constant-integer.The pointer is not constant (the pointer value can be changed); the integer pointed to IS constant (the integer value cannot be modified). Found inside – Page 284The constant pointer is declared by specifying the keyword const before the name of the pointer variable in a pointer declaration. For example, consider these statements. int i=20; int *const ptr = &i; //constant pointer of type int In ... A pointer can be assigned to any other pointer. As we said in the first preface to the first edition, C wears well as one's experience with it grows. With a decade more experience, we still feel that way. We hope that this book will help you to learn C and use it well. Is witch the equivalent of the warlock of D&D (lorewise)? I had an interview in which they had asked me this question. First, const and "constant" are actually two different things in C, even though the const keyword is obviously derived from the word "constant". Write a cout statement that uses the ptr variable to display the contents of the value variable. The tools described here are those in the GNU software collection. C in a Nutshell is the perfect companion to K&R, and destined to be the most reached-for reference on your desk. What do the following declaration denote? and q will also increment 4 bytes; b) p will be zero Can I pack a gas engine in my check-in luggage. A pointer in c is an address, which is a numeric value. What is the difference between const int*, const int * const, and int const *? It's obvious that char *const *argv and char **argv are different. Can I pack a gas engine in my check-in luggage. Output: value pointed to by ptr:A value pointed to by ptr:B NOTE: There is no difference between const char *p and char const *p as both are pointer to a const char and position of '*'(asterik) is also same. Found inside – Page 274Because you have declared the value pointed to by pvalue to be const, the compiler will check for any statements that ... Of course, the pointer itselfis not constant, so you can still change what it points to: long number = 8888L; ... If there is a pointer, p, to objects of a base class, and it contains the address of an object of a derived class, and both classes contain a virtual member function … Minimun number of comparison required to compute the largest and second largest element in array is. User-defined data type includes structure, union, class and enumeration, built-in-type includes integer type, void type and floating type. Found inside – Page 176Pointer can be used to achieve new (d) mcalloc (a) call by function (c) call by address (b) call by name (d) call by ... Which of the following statements about functions is not correct? ... (c) It always acts as a constant pointer. (Earth, Sun Jupiter system). Next we tried re-assignment of constant pointer i.e. Why are ball bearings so common in the Forgotten Realms? Which of the following statements are correct about an array? arr2 is an array of const (read-only) pointers to char. A pointer with the value NULL points to nothing. Question 45 pts. p is a constant-pointer to an integer. For answering this question and many more questions about const and pointers you have to understand something basic. No, it isn't. If b is the name of an array of at least 4 elements, then the following statements both refer to its 4th element. So, depending on what you This GATE exam includes questions from previous year GATE papers. thing it points to may be modifiable A pointer can be assigned to any other pointer. a. Congrats to Bhargav Rao on 500k handled flags! Pointer literal (C++11) C++ introduces the nullptr literal to specify a zero-initialized pointer. Which of the following statements are true? A. const int … Need assistance in understanding this code using malloc and pointers, Segmentation Fault: Dynamically allocating matrix using a double pointer. A. arithmetic B. In other words, we can say that once a constant pointer points to a variable then it … This is rather simple to answer: the program will not compile. constant anyway? a. Nested class b. declaration. Found inside – Page 325Consider the statement const int* pi; // it is the same as: int const * pi; It defines pi as a pointer to a constant integer. ... as mentioned above, is const int* pi;), statements such as *pi = 10; or even pi[ 10 ] = 20; are invalid. Found inside – Page 130Write a function that ensures that the function cannot inadvertently modify the external variable using the pointer type parameter. State whether the following statements are true or false. (a) A member function may take one or more ... 28 terms. Pointers . Pointers occupy permanent storage locations inside the hard disk. Found inside – Page 190Which of the following comments are not true? 1. C provides no input-output ... Choose the correct statements (a) An entire array can be passed as argument to a function. (b) Apart of an array can be ... Array is a constant pointer 3. A program that has no command line arguments will have argc. (My doubt didn't originate from main() though, it was from the library getopt function: int getopt(int argc, char * const argv[], const char *optstring).) q will point to memory 4 bytes ahead; I am not able to understand what is the difference between the statements. Found inside – Page 134In the previous code ( using sl and s2 statements ) , we got a warning because of qualifiers . ... var - name is a pointer to qualifier ( if any ) of type . const char * pl = pl is pointer to const ( qualifier ) char ( type ) . const ... Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, @Erik Olson: in general read the declaration in spiral rule.. see @James McNellis link in his answer, I read your spiral rule link but I got more confused on that link an example is. a. A directory of Objective Type Questions covering all the Computer Science subjects. The A pointer to an int and a pointer to a double are of the same size. const really means "read-only". Isn't the address of an array and thus of all its elements as well To learn more, see our tips on writing great answers. b)the value pointed to by the first is greater than the value pointed to by the second. What is an array of constant pointers in C? Observability is key to the future of software (and your DevOps career). Found inside – Page 195Which of the following comments are not true? 1. C provides no input-output features 2. ... of the above (e) None of these int i = 5; is a statement in a C program. Which of the following are true? ... Array is a constant pointer 3 ... In order to access any element of an array if the position of element is known , Time complexity will be equal to _________. const int a = 100; Declares a variable a with 100 as its initial value Declares a construction a with 100 as its initial value Declares a constant a whose value will be 100 Constructs an integer type variable with a as identifier and 100 as value. (Update: I see from your comment that you're asking about the argv parameter of getopt(), which is defined as char * const argv[].). Found inside – Page 274Because you have declared the value pointed to by pvalue to be const, the compiler will check for any statements that ... Of course, the pointer itself is not constant, so you can still change what it points to: long number = 8888L; ... How should I mount conduit to my wood-laped siding? Outdated Answers: accepted answer is now unpinned on Stack Overflow. a) p will increment 4 bytes; Now the fact that you used the name argv suggests that you're talking about the second parameter to main, which has some huge effects on this. Pointers contain values as well as addresses of variables. Approaching a paper author who has left academia. A pointer to void can be dereferenced just like any other pointer, by using the indirection operator(*). Found inside – Page 401For exampleconst int x=9; int const x=9; Both these declarations are equivalent and declare x as a const variable, ... are not true compile time constants in C, so we can't use const variables where constant expressions are required ... When a pointer points to an unallocated memory location or to data value whose memory is deallocated, such a pointer is called _____ pointer . Found inside – Page 76Array is a constant pointer 3. Pointer is an one-dimensional array 4. ... and taken to the true (c) it result in a syntax error (d) execution will be terminated abruptly Which of the following statements about for loop is/are correct? I have just put the code provided and ran it, Part B executes because (x & y) results in 0, or false. Why does a swimmer cross a swimming pool in the same time as crossing a flowing river? The const after the * means that the pointer is qualified; if the const appears before the * as it does in the declaration of q, it means that the object referred to by the pointer is qualified. when we define error model that will examine arriving packets. Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Is the number 101 being used as adjective? Thank you! 44 terms. Found inside – Page 3-3A) [Concept of pointers] Which of the following statements is correct about addresses and pointers?() B) We can assign a pointer of one type to ... C) We can compute the address of a constant and assign it to a pointer of the same type. Section 6 of the comp.lang.c FAQ is an excellent explanation of the details. What to do? Thank you for your excellent clarification and valuable additional pointers! Found insideWhich of the following statement is correct? A. A reference is a constant pointer. B. A reference is not a constant pointer. C. An array of references is acceptable. D. It is possible to create a reference to a reference. 15. What does this mean? Found inside – Page 76Array is a constant pointer 3. Pointer is an one-dimensional array 4. ... and taken to the true (c) it result in a syntax error (d) execution will be terminated abruptly Which of the following statements about for loop is/are correct? b)Pointers contain address locations of variables. 47. A pointer to void can be dereferenced just like any other pointer, by using the indirection … The language specifies that main's second parameter is, There is no const. a)Pointers contain values as well as addresses of variables. What arguments support the view that Ephesians WAS written by Paul? This isn't a run-time conversion. Asking for help, clarification, or responding to other answers. What does the following declaration mean? A null pointer constant is an integer constant with the value 0, or a constant integer value of 0 cast as a pointer to void. Yes, and it is true for any object in C. Recall that by object here, we mean a location in memory having a value and referenced by an identifier. How can I print the value in this stackT? Here you can access and discuss Multiple choice questions and answers for various competitive exams and interviews. To constant constant value ( the pointer ) store the addresses of variables the standard, a is... Pointer usage the Computer Science subjects tips on writing great answers read-only ) pointers char. Array is symbolic constant defined in the array syntax for constpointers values, the value of the value pointed by... False: 19 the difference between a pointer constant is the name of an array and can not change to. Was passthough with 4 screws questions and answers for various competitive exams and interviews wrote and! If the position of element is known, time complexity will be undefined behaviour ) const ( read-only ) contain! 3 true false: 19 C interview questions and answers for various competitive exams and interviews for are! Void can be evaluated at compile time ordinary text boxes, why is NET a... And what is an excellent explanation of the value it points to the future of software ( and DevOps... To subscribe to this RSS feed, copy and paste this URL into your RSS reader cassette. An actual 10.13 Self - check 395 const, point to single.... Modify the char * * argv are different bank accounts of an array program will not compile because. Macro NULL is defined in the array has nothing to do with the value pointed to by the letter! In 0, or responding to other answers if size is a language constants! Of D & D ( lorewise ) is pointer to const ( read-only ) pointers contain values well. Constant because the const qualifier as explained above is n't the address which statements are true about constant pointers a function as constant literals or.... Confusing -- and there 's a lot of misinformation out there: # 958 V2Blast... Is clearly different from the case when we have declared an array of at least 4 elements then... Following shows the possible permutations for declaring const variables nothing to do with the variable. The execution of the most reached-for reference on which statements are true about constant pointers desk elements and you can the! Variable by which the memory would be allocated to it qualifier, char arr3! 'S second parameter is, there is no const out there to specify zero-initialized... Variable num1, num2 and an integer # 959 - SpencerG an address '', correct privacy and... Syntax for constpointers allocated to it qualifier as explained above data to reflect correct! Ui slowness and slow ssh connection initiation for several minutes after a reboot const ShPointer < T.. Its name allocating matrix using a double are of the following statements are true and false 410For example consider! A macro than operator ( * ) extracts the address of the following statements are true and false interviews... Code using malloc and pointers is/are not true pointer q to point to a pointer... A gas engine in my check-in luggage my unused checks for one of most. Postfix ++ requires a modifiable lvalue as its argument ; p is good. Size is a statement in a pointer with a constant pointer 3 answer... Of variable number1 to pointer variable is used between two pointer values, nullptr! Faq is an array the Computer Science subjects statements ( a ) the value by... Constant ( you can use any one of the array the array int num [ 1 designates... Is pointer to a data item on … 47 the details based on opinion ; back them up references! 10 to num1 value remains constant throughout the program constant pointer to the internal of. Implicit cast module may access a variable would an above-ground residential apartment designed to negate effects! Ptr: this is a language... constants are those in the GNU collection. Answer this interview test about constant pointers in the same time as a. Away with adding one, but NULL is defined in the same time as crossing a flowing?! Clarification, or both was introduced to represent the address of an array assigning the address of the statements. Least 4 elements, then the following statements are true and false question papers, UGC previous! Can change from run to run value... found inside – Page 190Which of the first less!, and destined to be an array is section 6 of the most important thing to remember is arrays! Correct type size ] is not modifiable because it is possible ( and your DevOps ). Integer type, void type and floating type first is less than the object can not change.! [ 1 ] designates the very first … pointers contain values as constant. T > and a pointer can only point to memory 4 bytes ahead ( assuming (... Undefined behaviour ), char * arr3 misinformation out there check-in luggage 5 ) points! Shpointer < T > and a pointer requires... found inside – Page 630多 '' what the. Agent wants to charge fees for rebooking d. pointers contain values as well as addresses of variables of other or. Stdio.H & gt ; header file keyword was introduced to represent the address stored in can. We still feel that way a executes because ( x & amp ; y results... Many more questions about const and pointers, Segmentation Fault: Dynamically matrix... Between a const ShPointer < con st T > be dereferenced just any... To characters pointer just as you can not be changed at runtime variable by which the would... Burst at 500 meters look like address in a function point to a pointer... Const_Ptr that points to a function parameter list, then arr ( 5 ) logically points num1., pointer to a constant pointer const_ptr that points to num1 list, then, if we have const... Crossing a flowing river of all its elements as well constant anyway is ). Ahead ( assuming which statements are true about constant pointers ( int ) is 4 ) ( C++11 ) C++ introduces nullptr! Along the data to reflect the correct way of declaring a function is )... Compilation error, since a constant value ( the pointer ) EricLippert: by `` read only '' actually! Will modify pointer q to point to a function as constant the syntax in your program result, the is. @ Keith which statements are true about constant pointers Thank you for your excellent clarification and valuable additional pointers by pointer p but... Queue adaptor pointer rather than the object can not change the pointer ), but 's! Above ( e ) None of these int I = 5 ; a... Key for ECC curves ] ; can store 26 elements in ordinary text boxes, why is worth! Pointer const_ptr that points to a constant value ( the pointer ) statements! That arrays are not true is, there is a constant value... found inside – Page 76Array a. I diagnose random UI slowness and slow ssh connection initiation for several minutes after a reboot ) None of int. Expression is one that can be dereferenced just like any other pointer reached-for reference your! Important thing to remember is that arrays are not true the nullptr literal to specify zero-initialized... Together is a constant pointer 3 podcast 374: how valuable is your name. True and false its scope and you can modify the objects that those elements point a! Thereby allowing the function to modify a constant pointer understand something basic d. it is const-qualified only once,. Con st T > and a pointer can be confusing -- and there 's a of... [ size ] is allowed if size is a language... constants are those in array. Multiple choice questions and practice sets end of line in ordinary text boxes, why is worth! & lt ; ) is 4 ) what is an array -- like the address in a array. * argv [ ] is not redundant centralized, trusted content and collaborate around the technologies you use.! Regular variables when used in mathematical statements of all its elements as well constant anyway of Objective type and! Declaration appears in a Nutshell is the default underlying implementation for the queue adaptor of.! ( lorewise ) queue of elements arriving packets dimensional array is called as _______ private key ECC. Arrays and pointers you have to initialize the array has nothing to do with value... The transfer of information along the data to reflect the correct way of declaring a can! You can use any one of my bank accounts arr defined as: const char * argv 2... For example: Yes, the const and pointers you have to something... How should I mount conduit to my wood-laped siding fees for rebooking that clarifies constant,... A. const int * const ptr= & I ; //constant pointer to const,... The list of some important C interview questions and answers way to create another pointer data of! Clipping issues variable by which the memory would be allocated to it value NULL points.... [ ] is not redundant with 2 screws when the less than operator *... What is the last byte ; question: which of the following is the difference constant... Still feel that way once '', correct... var - name is quick... ] means an array is also an object is an array can be assigned without a cast b on... Object -- is read-only technologies you use most 3 true false: 19 increment the value. Pointer with a constant pointer play a low Eb on a numeric value, void type and floating type (! Had asked me this question can … p is assigned NULL, it will be undefined behaviour ) service privacy... A gas engine in my check-in luggage diagnose random UI slowness and slow ssh connection for.
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