Recent questions tagged pointers / GATE Overflow for GATE CSE

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1 answer

31

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

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

robinofautumn

497 views

robinofautumn asked Dec 8, 2022

1 votes

2 answers

32

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

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); *...

Souvik33

630 views

Souvik33 asked Nov 28, 2022

0 votes

0 answers

33

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.

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 si...

Pranavpurkar

537 views

Pranavpurkar asked Sep 27, 2022

0 votes

1 answer

34

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

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)#incl...

admin

389 views

admin asked Aug 8, 2022

4 votes

2 answers

35

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.

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 sy...

GO Classes

881 views

GO Classes asked Aug 6, 2022

2 votes

1 answer

36

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

Consider the following declarations of a few variables.int (*p1)[3]; int (*p2)[3]; int (*t1) ; int (*t2) ;Let the initial values of $p1, p2, t2$ and $t1$ are $1000, 1036,...

GO Classes

563 views

GO Classes asked Aug 6, 2022

4 votes

1 answer

37

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.

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 ...

GO Classes

646 views

GO Classes asked Aug 6, 2022

4 votes

3 answers

38

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).

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 fol...

GO Classes

1.1k views

GO Classes asked Aug 6, 2022

3 votes

1 answer

39

GO Classes Test Series 2024 | Programming | Test 3 | Question: 19
#include<stdio.h> int test(int *a, int *b) { int c = *a-*b; if (c<0) return 0; else return (1 + test(&c, b)); } void main() { int x = 15; int y = 4; int a = test(&x,&y); printf("%d", a); } $2$ $3$ $4$ Run time error since we can not pass the address of local variable c in the function test.

#include<stdio.h int test(int *a, int *b) { int c = *a-*b; if (c<0) return 0; else return (1 + test(&c, b)); } void main() { int x = 15; int y = 4; int a = test(&x,&y); p...

GO Classes

393 views

GO Classes asked Apr 30, 2022

3 votes

1 answer

40

GO Classes Test Series 2024 | Programming | Test 3 | Question: 21
Consider the following C code where main shows the intended use of the functions relating to struct foo. struct foo { int x; int y; int * p; }; struct foo* make_foo() { struct foo *foo = malloc(sizeof( ... program has a dangling pointer Given program may result in run time error Given program will result in a compile-time error

Consider the following C code where main shows the intended use of the functions relating to struct foo.struct foo { int x; int y; int * p; }; struct foo* make_foo() { st...

GO Classes

555 views

GO Classes asked Apr 30, 2022

3 votes

1 answer

41

GO Classes Test Series 2024 | Programming | Test 3 | Question: 26
What will be the output of the following C program? #include<stdio.h> int main() { static int p[] = {1, 2, 3, 0, 5, 6}; static int *q[] = {p+2, p+1, p, p+3, p+4, p+5}; static int **r[] = {q+4, q+5, q+1, q, q+2, q+3}; int ***pt; pt = r + 2; printf("%d", ***(pt+3)-**(q+1)); }

What will be the output of the following C program?#include<stdio.h int main() { static int p[] = {1, 2, 3, 0, 5, 6}; static int *q[] = {p+2, p+1, p, p+3, p+4, p+5}; stat...

GO Classes

442 views

GO Classes asked Apr 30, 2022

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