Pointers in C

Pointers in C

Multiple Choice

Code to change the 3rd array value to 50 using pointers

int main(){

int a[] = {10,20,30};

int *p = a;

----------------------;

}

• p+3 = 50

• *(p+3) = 50

• *p+2 = 50

• *(p+2) = 50

Multiple Choice

Point out the compile time error in the program given below.

#include<stdio.h>

int main()

{

int *x;

*x=100;

return 0;

}

• Error: invalid assignment for x

• Error: suspicious pointer conversion

• No error

• None of the above

Multiple Choice

In a C program,

int a = 20;

*ptr = &a;

**dptr = &ptr;

printf ("%d", **dptr);

prints

• address of a

• address of ptr

• value of a

• address of dptr

Multiple Choice

In a C Program if

int a = 5;

Int *ptr = &a;

then the printf statement with

&a, a, *ptr , ptr

• adrress, Value, Value, Adress

• address, value, value, value

• all address

• All values

Multiple Choice

In a C program,

int a = 20;

*ptr = &a;

**dptr = &ptr;

printf ("%d", **dptr);

prints

• address of a

• address of ptr

• value of a

• address of dptr

Multiple Choice

which of the following is the dereference operator

• &

• *

• #

• @

Multiple Choice

int a=10;

int *b=&a,**c=&b;

**c=*b-**c;

what is the value of a?

• 10

• 5

• 0

• 4

Multiple Select

which of the following defines NULL pointer

• data_type * var=NULL;

• data_type *var=0;

• data_type *var='\0';

• all the above