Which operator is used to get the address of a variable in C?
A * B & C -> D .
The & operator (address-of operator) returns the memory address of a variable.
What will be the size of a pointer variable on a 64-bit system?
A 2 bytes B 4 bytes C 8 bytes D 16 bytes
On a 64-bit system, a pointer is 8 bytes (64 bits) regardless of the data type it points to.
What is a NULL pointer?
A Pointer pointing to address 0 B Uninitialized pointer C Pointer with no name D Invalid pointer
A NULL pointer is a pointer that points to memory address 0, indicating it doesn't point to any valid memory location.
Which of the following is NOT a valid pointer declaration?
A int *p; B float *q; C void *r; D int &s;
& is a reference operator used in C++, not in C. In C, pointers are declared using *.
Identify the output:
A H B Hello C e D Address
*str dereferences the pointer to get the first character of the string, which is 'H'.
A pointer variable stores the _____ of another variable.
A value B memory address C data type D size
Pointers store memory addresses of variables. The address-of operator (&) retrieves this address.
What is the size of a pointer variable on a 32-bit system?
A 2 bytes B 4 bytes C 8 bytes D Depends on the data type
On a 32-bit system, all pointers are 4 bytes (32 bits) regardless of the data type they point to.
Consider: int x = 10; int *p = &x; What does the expression *p represent?
A The address of x B The pointer variable p C The value stored in x D The size of x
The dereference operator (*) accesses the value at the address pointed to by p, which is the value 10.
Which operator is used to get the address of a variable?
A * (asterisk) B & (ampersand) C -> (arrow) D . (dot)
The & (address-of) operator returns the memory address of a variable.
What will be printed by the code: char *ptr = "Hello"; printf("%c", *ptr);
A H B Hello C e D Error
ptr points to the first character of the string, so *ptr dereferences to 'H'. The %c format specifier prints a single character.
What is the size of a pointer variable in a 64-bit system?
A 8 bytes B 4 bytes C Depends on data type D 16 bytes
In a 64-bit system, all pointers occupy 8 bytes regardless of the data type they point to.
What does the & operator do when used with a variable?
A Returns the value of the variable B Returns the address of the variable C Creates a copy of the variable D Deallocates memory
The & (address-of) operator returns the memory address of the variable.
What is the output of the following code?
A Address of x B 20 C Garbage value D Compilation error
The * operator dereferences the pointer p, accessing the value it points to, which is 20.
Which of the following is a void pointer?
A A pointer that points to nothing B A generic pointer that can point to any data type C A pointer declared as void variable D A pointer that has been deleted
void* is a generic pointer that can hold addresses of any data type and requires explicit typecasting when used.
What is the output of the following code?
A 5 B Garbage value C Address of x D Compilation error
q is a pointer to pointer p. **q dereferences p twice, giving the value of x which is 5.
What will be the size of the pointer variable on a 64-bit system?
A 4 bytes B 8 bytes C Depends on int size D 16 bytes
On a 64-bit system, all pointers are 8 bytes regardless of the data type they point to.
What is the output?
A 20 20 B 10 20 C 20 10 D 30 30
p+1 points to second element (20). arr[1] is also 20. Both print the same value.
What does void *ptr represent?
A Generic pointer that can point to any data type B Pointer that points to nothing C Null pointer D Invalid pointer declaration
void* is a generic pointer. It can be cast to any other pointer type. No arithmetic can be done directly.
What is the output?
A 5 10 B 10 5 C 10 10 D 5 5
swap() exchanges values through pointers. x becomes 10, y becomes 5 after function call.
What is the output?
A A B B C C D Null character
p+2 points to str[2] which is 'C'. Note: str[3] is null terminator.
