How do you define pointers in the C language?

In the C language, pointers can be defined in the following way:

1. Basic syntax: data type *pointer variable name;
2. Example: a pointer named ptr of type int.

The above code defines a pointer variable named ptr that can point to data of type int.

Instructions:

1. The asterisk (*) before the variable name indicates that the variable is a pointer type.
2. Data type represents the type of data that a pointer points to.
3. When defining a pointer, it is optional to initialize the pointer variable as NULL, indicating that the pointer does not point to any valid memory address. For example: int *ptr = NULL;.

By using pointers, it is possible to access and manipulate specific locations in memory, which is very useful for tasks such as dynamic memory allocation, passing parameters, and managing data structures.