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Recent questions tagged pointers

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physics wallah dpp #clanguage #pointer

_Harshit asked in Programming Mar 18

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TestBook testseries TLB and C programming combined question
Consider the following C function executed in an OS with paging where the page size is 4 kilobytes. Further, assume that the system employs a 32-entry direct mapped TLB. int *alloc_and_init() { int counter, value=0, size=2048; int ... of the program, what is the number of TLB misses during the execution of the for loop? 0 1 2048 2

Sahil_Lather asked in Programming Jan 28

by Sahil_Lather

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#selfdoubt
What will happen if we dereference a dangling pointer? will it lead to a segmentation fault(core dumped) or an invalid pointer error?

robinofautumn asked in Programming Dec 8, 2022

by robinofautumn

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1 vote

2 answers

4

Malloc | Free | Dangling Pointer | Prog. & DS
MSQ Consider the following C snippet: #include <stdio.h> int main() { int *ptr = (int*) malloc(100*sizeof(int)); *ptr=33; printf("%d %d\n",ptr,*ptr); // Line X free(ptr); *ptr=37; printf("%d %d\n",ptr,* ... *ptr) is 0 as in Line Y, the allocated heap is freed, and we cannot update it anymore, as ptr is now a dangling pointer

Souvik33 asked in Programming Nov 28, 2022

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Unacademy test series
Which of the following is/are true regarding the following code snippet? 1:int *p; 2:p = &q; A)*p gives faster retrieval of information than q. B)The size of p is same as size of int. C)Only statement 2 gives an error. D)In statement 1, * is used as a dereferencing operator.

Pranavpurkar asked in Programming Sep 27, 2022

by Pranavpurkar

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1 answer

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ISI2020-PCB-CS: 1.1
Consider the two $\mathrm{C}$ programs given below. C-CODE (I) #include<stdio.h> int main() { int n=2, *ptr=&n ; n*=3; printf ("%d", (*ptr**ptr)*(*ptr**ptr)); } C-CODE(II) #include<stdio.h> int main() { int n=2, *ptr=&n ; n*=3; ... $1296$ Output of (I) is $1296$ and (II) is $216$ Output of both (I) and (II) is $1296$ None of the above

Lakshman Patel RJIT asked in Programming Aug 8, 2022

by Lakshman Patel RJIT

190 views

3 votes

2 answers

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GO Classes Scholarship 2023 | Test | Question: 18
Consider the following declaration of pointer variable $p.$ int (*p)[10][5]; If the initial value of $p$ is $1000,$ then what will be the value of $p+1?$ It is given that system has $8$ bytes of address size and $4$ bytes of integer size.

GO Classes asked in Programming Aug 7, 2022

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1 vote

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GO Classes Scholarship 2023 | Test | Question: 20
Consider the following declarations of a few variables. int (*p1)[3]; int (*p2)[3]; int (*t1)[2]; int (*t2)[2]; Let the initial values of $p1, p2, t2$ and $t1$ are $1000, 1036, 2000$ and $2040$ respectively. Consider ... is correct but $\text{S2}$ is incorrect $\text{S2}$ is correct but $\text{S1}$ is incorrect Both are correct Both are incorrect

GO Classes asked in Programming Aug 7, 2022

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1 answer

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GO Classes Scholarship 2023 | Test | Question: 22
Consider below two program fragments. Assume malloc is always successful, and sizes are as follows - sizeof (int *)=8 bytes sizeof ( double)=8 bytes sizeof ( char )=1 byte sizeof ( int )=4 byte Program 1 int **p; p = (int ... run time error, but Program $1$ will run fine. Both programs will always run fine. Both programs may produce run time errors.

GO Classes asked in Programming Aug 7, 2022

303 views

4 votes

3 answers

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GO Classes Scholarship 2023 | Test | Question: 30
Consider the following C code fragement - #include<stdio.h> int main() { char t[] = "abcdefghij"; int *p = t; p+=2; char *c = (char *)p; printf("%c", *c); } Which of the following is/are correct? The ... $\textsf{ i "}$ (without quotes).

GO Classes asked in Programming Aug 7, 2022

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Recent questions tagged pointers