C++
a) What is a null pointer?
b) Give an example of a function that returns a pointer.
Solution
a)
A pointer that is assigned NULL is called a null pointer.
The NULL pointer is a constant with a value of zero defined in several standard libraries, including iostream.
It is always a good practice to assign the pointer NULL to a pointer variable in case you do not have exact address to be assigned.
Example : int *ptr = NULL; // integer pointer pointing to NULL
b)
// function that returns a pointer to integer variable
int *add(int a, int b){
int c = a+ b;
int *iptr = &c; // pointer that stores address of c
return iptr;
}
.
C++ a) What is a null pointer- b) Give an example of a function that r.docx
1. C++
a) What is a null pointer?
b) Give an example of a function that returns a pointer.
Solution
a)
A pointer that is assigned NULL is called a null pointer.
The NULL pointer is a constant with a value of zero defined in several standard libraries,
including iostream.
It is always a good practice to assign the pointer NULL to a pointer variable in case you do not
have exact address to be assigned.
Example : int *ptr = NULL; // integer pointer pointing to NULL
b)
// function that returns a pointer to integer variable
int *add(int a, int b){
int c = a+ b;
int *iptr = &c; // pointer that stores address of c
return iptr;
}
