Chapter 16 - Applying Pointers
In Chapter 11, "An Introduction to Pointers," you learned the basics of using pointers in C. Because pointers are very useful in programming, it's worth spending another hour to learn more about them. In this lesson, the following topics are discussed:
Pointer arithmetic
Passing arrays to functions
Passing pointers to functions
Pointing to functions
Summary
- You should always make sure that a pointer is pointing to a legal and valid memory location before you use it.
- The position of a pointer can be moved by adding or subtracting an integer.
- The scalar size of a pointer is determined by its data type, which is specified in the pointer declaration.
- For two pointers of the same type, you can subtract one pointer value from the other.
- The elements in an array can be accessed via a pointer that holds the start address of the array.
- You can pass an unsized array as a single argument to a function.
- Also, you can pass an array to a function through a pointer. The pointer should hold the start address of the array.
- You can either pass the unsized format of a multidimensional array or a pointer that contains the start address of the multidimensional array to a function.
- Arrays of pointers are useful in many cases that deal with character strings.
- You can call a function via a pointer that holds the address of the function.
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