The correct answer is: B. pointer to
An asterisk placed after a data type means that the variable is a pointer to that data type. A pointer is a variable that stores the address of another variable. This allows you to access the value of the other variable indirectly, through the pointer.
For example, if you have a variable called x that is of type int, you can declare a pointer to int called p as follows:
int x;
int *p;
The variable p now stores the address of the variable x. You can access the value of x through p as follows:
*p = 10;
This will set the value of x to 10.
You can also use pointers to create arrays. For example, if you want to create an array of 10 integers, you can do so as follows:
int x[10];
However, if you want to create a pointer to an array of 10 integers, you can do so as follows:
int *p = x;
The variable p now stores the address of the array x. You can access the elements of the array through p as follows:
*(p + 0) = 10;
*(p + 1) = 20;
*(p + 2) = 30;
This will set the first three elements of the array to 10, 20, and 30, respectively.
Pointers are a powerful tool that can be used to manipulate data in a variety of ways. However, they can also be dangerous if not used properly. It is important to understand the concept of pointers before using them in your code.