Arithmetic operations of pointers
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  • What you'll learn
    • ✓Incrementing and Decrementing Pointers.Addition of Constant to Pointers.Subtraction of Constant from Pointers.Subtraction of Two Pointers of the Same Type.Comparison of Pointers.
    ✓What are pointer arithmetic operations?
    ✓What is the operation of pointers in C++?
    ✓Which operator is used for pointer arithmetic in C++?
    ✓What are the arithmetic operations in C++?
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  • Pointer Arithmetic is the set of valid arithmetic operations that can be performed on pointers. The pointer variables store the memory address of another variable. It doesn't store any value. Hence, there are only a few operations that are allowed to perform on Pointers in C++ language.
  • C++ provides two pointer operators, which are (a) Address of Operator & and (b) Indirection Operator *. A pointer is a variable that contains the address of another variable or you can say that a variable that contains the address of another variable is said to "point to" the other variable.
  • The increment ( ++ ) operator increases the value of a pointer by the size of the data object the pointer refers to. For example, if the pointer refers to the second element in an array, the ++ makes the pointer refer to the third element in the array.
  • Increment/Decrement of a Pointer. Addition of integer to a pointer. Subtraction of integer to a pointer. Subtracting two pointers of the same type. Comparison of pointers.
  • The syntax of declaring a pointer is to place a * in front of the name. A pointer is associated with a type (such as int and double ) too. Naming Convention of Pointers: Include a " p " or " ptr " as prefix or suffix, e.g., iPtr , numberPtr , pNumber , pStudent .
  • Because it permits direct access to memory locations and the manipulation of memory addresses, pointer arithmetic is advantageous and useful in that it enables more effective memory management. Thus, data can be accessed directly by programs without of needing to be copied numerous times or indirectly through an array.
  • The main arithmetic operations are addition, subtraction, multiplication, and division. Arithmetic systems can be distinguished based on the type of number they operate on. Integer arithmetic restricts itself to calculations with positive and negative whole numbers.
  • Pointers are useful in C++ because they allow us to manipulate memory directly, and they provide a way to pass data between functions efficiently.
  • Pointers are used to store and manage the addresses of dynamically allocated blocks of memory. Such blocks are used to store data objects or arrays of objects.
  • Use the order of operations: PEMDAS (Parentheses, Exponents, Multiplication, Division, Addition, Subtraction). We want to solve what's in the parentheses first. Now, do the division and the multiplication. Finally, subtract.

Requirement

Incrementing and Decrementing Pointers. Addition of Constant to Pointers. Subtraction of Constant from Pointers. Subtraction of Two Pointers of the Same Type. Comparison of Pointers.

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