In computer programming, a null object is a special value that represents the absence of an object. It is often used to indicate that a variable has not been assigned a value or that a function has not returned a value. In C programming language, there are several ways to check if an object is null.
One way to check if an object is null is to use the == operator. The == operator compares two values and returns true if they are equal and false if they are not. For example, the following code checks if the variable “obj” is null: