QUIZ ON : c - POINTERS

POINTERS

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Question No# : 01 out of 32

*ptr++ is equivalent to

A. ptr++

B. *ptr

C. ++ptr

D. ++*ptr

Question No# : 02 out of 32

Which header file should be included to use functions like malloc() and calloc()?

A. memory.h

B. stdlib.h

C. string.h

D. dos.h

Question No# : 03 out of 32

What will be the output of the following code?

main() { int c,d, *p1=&c,*p2=&d, x;

c =10,d =4;

x = –3* – *p2 / *p1 + 5;

printf(“%d ”,x);

}

A. 6

B. Invalid syntax because / * is used for comments.

C. 8

D. IInvalid syntax because three binary operators can’t be together in an expression.

Question No# : 04 out of 32

In C, if you pass an array as an argument to a function, what actually gets passed?

A. Value of elements in array

B. First element of the array

C. Base address of the array

D. Address of the last element of array

Question No# : 05 out of 32

Difference between calloc() and malloc() is:

A. calloc() takes a single argument while malloc() needs two arguments

B. malloc() takes a single argument while calloc() needs two arguments

C. malloc() initializes the allocated memory to ZERO

D. calloc() initializes the allocated memory to NULL

Question No# : 06 out of 32

Which of the following defines a variable ‘a’ as an array of pointers to integers?

A. int *b[10], a[10];

B. int *b, a[10];

C. int b, *a[10];

D. int b, (*a)[10];

Question No# : 07 out of 32

In ‘C’, if you pass an array as an argument to a function, what actually gets passed?

A. Value of elements in array

B. First element of the array

C. Base address of the array

D. Address of the last element of array

Question No# : 08 out of 32

Which of the following accesses a variable in a pointer to a structure, *b?

A. b->var;

B. b.var;

C. b-var;

D. b>var;

Question No# : 09 out of 32

Which of the following is a wrong pointer declaration?

A. int *int(a);

B. int *x, *y;

C. float *aptr;

D. int *x; float *y;

Question No# : 10 out of 32

The operator used to get value at address stored in a pointer variable is

A. *

B. &

C. &&

D. ||

Question No# : 11 out of 32

With every use of a memory allocation function, what function should be used to release allocated memory which is no longer needed?

A. unalloc()

B. Dropmem()

C. Dealloc()

D. free()

Question No# : 12 out of 32

Which of the following declaration is not supported by C?

A. String str;

B. char *str;

C. float str = 3e2;

D. Both String str; & float str = 3e2;

Question No# : 13 out of 32

How will you free the allocated memory?

A. remove(var-name);

B. free(var-name);

C. delete(var-name);

D. dalloc(var-name);

Question No# : 14 out of 32

What will be the output of following program

void main()

{

int x,y = 10;

x = y * NULL;

printf(“\n %d \n", x);

}

A. error

B. 0

C. 10

D. Garbage value

Question No# : 15 out of 32

In which header file is the NULL macro defined?

A. stdio.h

B. stddef.h

C. stdio.h and stddef.h

D. math.h

Question No# : 16 out of 32

How many bytes are occupied by near, far and huge pointers (DOS)?

A. near=2 far=4 huge=4

B. near=4 far=8 huge=8

C. near=2 far=4 huge=8

D. near=4 far=4 huge=8

Question No# : 17 out of 32

Declaration int *(*p) int(*a) is

A. A pointer to function that accept an integer argument and return an integer

B. A pointer to a, which returns an integer

C. A pointer to subroutine which returns an integer

D. None of the above

Question No# : 18 out of 32

What do the following declarations signify? void *cmp();

A. cmp is a pointer to an void type.

B. cmp is a void type pointer variable.

C. cmp is a function that return a void pointer.

D. cmp function returns nothing.

Question No# : 19 out of 32

*ptr ++ is equivalent to

A. ptr++

B. *ptr

C. ++ptr

D. ++*ptr

Question No# : 20 out of 32

An array of pointers is same as

A. pointer to array

B. pointers to pointers

C. pointer to function

D. pointer to structure

Question No# : 21 out of 32

If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable.

A. ‘.’

B. ‘&’

C. ‘*’

D. ‘->’

Question No# : 22 out of 32

What is (void*)0?

A. Representation of NULL pointer

B. Representation of void pointer

C. Error

D. None of above

Question No# : 23 out of 32

Which of the following functions is used to free the allocated memory?

A. remove(var-name);

B. free(var-name);

C. delete(var-name);

D. dalloc(var-name);

Question No# : 24 out of 32

What function should be used to free the memory allocated by calloc() ?

A. dealloc();

B. malloc(variable_name, 0)

C. free();

D. memalloc(variable_name, 0)

Question No# : 25 out of 32

Which of the following declaration is illegal?

A. char *str = “Best C programming classes by Sanfoundry”;

B. char str[] = “Best C programming classes by Sanfoundry”;

C. char str[20] = “Best C programming classes by Sanfoundry”;

D. char[] str = “Best C programming classes by Sanfoundry”;

Question No# : 26 out of 32

Consider a structure defined as follows:

struct student {

int rollNo, marks;

char name[30], course[30];

} s, *sp;

Which of the following is the correct way to access the members of the structure?

A. sp.marks

B. sp -> rollNo

C. student.course

D. s -> name

Question No# : 27 out of 32

Identify the invalid declaration:

A. int &p;

B. int *p[10];

C. int **p;

D. int *p[ ];

Question No# : 28 out of 32

Which of the following expression is equivalent to ++*ptr?

A. (*ptr)++

B. ++*(ptr)

C. (ptr)*++

D. (ptr)++*

Question No# : 29 out of 32

Specify the 2 library functions to dynamically allocate memory?

A. malloc() and memalloc()

B. alloc() and memalloc()

C. malloc() and calloc()

D. memalloc() and faralloc()

Question No# : 30 out of 32

What will be the output of the following code segment?

char *p = "Structured Programming";

printf("%s", p + 5);

A. Structured Programming

B. tured Programming

C. ctured Programming

D. There will be no output as there is a syntax error in code

Question No# : 31 out of 32

Which of the following statements will not dynamically allocate space to store 10 integers?

A. int a[10];

B. int *p = (int *) malloc(10 * sizeof(int));

C. int *p = (int *) calloc(10, sizeof(int));

D. none of the above

Question No# : 32 out of 32

A pointer is

A. A keyword used to create variables

B. A variable that stores address of an instruction

C. A variable that stores address of other variable

D. All of the above