{"id":11175,"date":"2024-12-07T14:06:55","date_gmt":"2024-12-07T14:06:55","guid":{"rendered":"https:\/\/cstaleem.com\/?p=11175"},"modified":"2024-11-07T14:13:34","modified_gmt":"2024-11-07T14:13:34","slug":"pointer-in-c-programming-examples-double-pointer-use","status":"publish","type":"post","link":"https:\/\/cstaleem.com\/pointer-in-c-programming-examples-double-pointer-use","title":{"rendered":"Pointer In C Programming Examples | Double Pointer & Use"},"content":{"rendered":"

Pointer In C Programming Examples | Double Pointer & Use<\/span><\/h1>\n

A pointer is also a variable that stores the memory address of another variable. The pointer variable itself also contains the address of memory. Pointers cannot store direct values; they only store memory addresses of where values are located.<\/span><\/p>\n

This is useful for various reasons, such as dynamic memory allocation, arrays, and functions. <\/span>As we know compiler assigns a unique address to each variable in a program.<\/span><\/p>\n

\"How<\/p>\n

\u00a0Pointer Declaration and Initialization: Code Example\u00a0<\/span><\/strong><\/span><\/h2>\n

Here\u2019s a very simple example of pointer declaration and initialization in C<\/span><\/p>\n

#include <stdio.h><\/span>\r\nint main()<\/span>\r\n{<\/span>\r\n \u00a0\u00a0 int a = 20;<\/span>\r\n \u00a0\u00a0 int *ptr;\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ pointer declaration<\/span>\r\n \u00a0\u00a0 ptr = &a;\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ pointer initialization<\/span>\r\n \u00a0\u00a0 printf(\"Address of a: %p\\n\", &a);\u00a0 \/\/ Output: a's address<\/span>\r\n \u00a0\u00a0 printf(\"Address of *ptr: %p\\n\", &(*ptr));\u00a0 \/\/ Output: a's address<\/span>\r\n \u00a0\u00a0 printf(\"Value of ptr: %p\\n\", ptr);\u00a0 \/\/ Output: a's address<\/span>\r\n \u00a0\u00a0 printf(\"Value of a: %d\\n\", a);\u00a0 \/\/ Output: 20 (value of a)<\/span>\r\n \u00a0\u00a0 printf(\"Value of *ptr: %d\\n\", *ptr);\u00a0 \/\/ Output: 20 (value at a's address)<\/span>\r\n \u00a0\u00a0 printf(\"Value of *&a: %d\\n\", *(&a));\u00a0 \/\/ Output: 20 (same as above)<\/span>\r\n \u00a0\u00a0 printf(\"Address of ptr: %p\\n\", &ptr);\u00a0 \/\/ Output: ptr's address<\/span>\r\n \u00a0\u00a0 return 0;<\/span>\r\n}<\/span><\/pre>\n
Output:<\/strong><\/span><\/p>\n
Address of a: 000000000061FE1C<\/span>\r\nAddress of *ptr: 000000000061FE1C<\/span>\r\nValue of ptr: 000000000061FE1C<\/span>\r\nValue of a: 20<\/span>\r\nValue of *ptr: 20<\/span>\r\nValue of *&a: 20<\/span>\r\nAddress of ptr: 000000000061FE10<\/span><\/pre>\n
Explanation: <\/strong><\/span>&var<\/strong> gives the address of var. <\/span>*ptr<\/strong> giving you the value stored at that address.<\/span><\/p>\n\n\n\n
Important<\/strong>:<\/span><\/p>\n
 Dereferencing<\/strong> a pointer means accessing the value stored at the memory address the pointer holds. dereferencing a pointer is done using the * operator.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Double Pointer (Pointer to Pointer)<\/strong><\/span><\/h2>\n
In C, a pointer-to-pointer (or “double pointer”) allows us to store the address of another pointer. Here\u2019s a simple example diagram<\/span><\/p>\n
\"double<\/p>\n
According to above diagram,\u00a0<\/strong><\/span>var<\/strong> is an integer variable set to 20. <\/span>ptr1<\/strong> is a pointer variable that holds the address of var. <\/span>ptr2<\/strong> is a pointer-to-pointer variable that holds the address of ptr1.<\/span><\/p>\n
Double Pointer Code Example<\/strong><\/span><\/h3>\n
#include <stdio.h><\/span>\r\nint main() {<\/span>\r\n \u00a0\u00a0 int var = 20;<\/span>\r\n \u00a0\u00a0 int *ptr1 = &var;\u00a0\u00a0 \/\/ Pointer to var<\/span>\r\n \u00a0\u00a0 int **ptr2 = &ptr1; \/\/ Pointer to ptr1<\/span>\r\n \u00a0\u00a0 printf(\"Value pointed to by ptr: %d\\n\", *ptr1); \/\/ Prints 20<\/span>\r\n \u00a0\u00a0 printf(\"Value pointed to by pptr: %d\\n\", **ptr2); \/\/ Prints 20<\/span>\r\n \u00a0\u00a0 return 0;\r\n<\/span>}<\/span><\/pre>\n
Output:<\/strong><\/span><\/p>\n
Value pointed to by ptr: 20<\/span>\r\nValue pointed to by pptr: 20<\/span><\/pre>\n
Use of Pointer<\/span><\/h2>\n
Pointers are very powerful and useful in programming, especially in languages like C and C++. Here are some key uses of pointers:<\/span><\/p>\n
1. Dynamic Memory Allocation<\/strong><\/span><\/h3>\n
Pointers are essential for managing memory dynamically. Functions like malloc<\/code>, calloc<\/code>, and free<\/code> use pointers to allocate and deallocate memory.<\/span><\/p>\n
Example:<\/strong><\/span><\/p>\n
\n
int<\/span> *ptr = (int<\/span>*) malloc<\/span>(sizeof<\/span>(int<\/span>) * 5<\/span>);  \/\/ Allocates memory for 5 integers<\/span>\u00a0<\/code><\/span><\/pre>\n<\/div>\n
2. Efficient Array and String Handling<\/strong><\/span><\/h3>\n
Pointers provide direct access to array elements and can optimize string manipulation, as arrays are essentially pointers to the first element.<\/span><\/p>\n
Example:<\/strong><\/span><\/p>\n
\n
int<\/span> arr[] = {41<\/span>, 25<\/span>, 33<\/span>, 41<\/span>, 50<\/span>};<\/code><\/span>\r\nint<\/span> *ptr = arr;  \/\/ Pointer to the first element of the array\r\n<\/span><\/code><\/span>printf(\"%d \\n\", *(ptr)); \/\/ Dereferencing pointer (output 41)\r\nprintf<\/span>(\"%d\\n\"<\/span>, *(ptr + 2<\/span>));  \/\/ Access the third element: 33\r\n<\/span><\/code>\/\/ Accessing and printing each element using pointer\r\nfor (int i = 0; i < 5; i++) {\r\nprintf(\"%d \", *(ptr + i)); \/\/ Dereferencing pointer to access elements\r\n}\r\nprintf(\"\\n\"); \/\/ Output: 41<\/span>, 25<\/span>, 33<\/span>, 41<\/span>, 50\r\n<\/span><\/code><\/span>return 0;\r\n}<\/pre>\n<\/div>\n
3. Function Arguments (Passing by Reference)<\/strong><\/span><\/h3>\n
Pointers allow passing by reference, enabling functions to modify the original data, which is efficient in terms of memory and performance.<\/span><\/p>\n
Example:<\/strong><\/span><\/p>\n
void updateValue(int *ptr) {\r\n<\/span>*ptr = 20; \/\/ Dereference and modify the original value\r\n}\r\nint main() {\r\nint number = 10;\r\nupdateValue(&number); \/\/ Pass the address of 'number'\r\nprintf(\"%d\", number); \/\/ Prints 20\r\nreturn 0;\r\n}<\/pre>\n
\n
\n
4. <\/span>Building Data Structures (Linked Lists, Trees, Graphs)<\/strong><\/h3>\n<\/div>\n<\/div>\n
Pointers are crucial for building complex data structures like linked lists, trees, and graphs, where each element points to others.<\/span><\/p>\n
Example (Linked List):<\/strong><\/span><\/p>\n
\n
struct<\/span> Node<\/span> {<\/span><\/code><\/span>\r\n    int<\/span> data;<\/code><\/span>\r\n    struct<\/span> Node<\/span> *next<\/span>;<\/span>  \/\/ Pointer to the next node<\/span><\/code><\/span>\r\n};\r\n<\/code><\/span><\/pre>\n<\/div>\n
5. Accessing Hardware and Memory Directly<\/strong><\/span><\/h3>\n
In low-level programming (e.g., embedded systems), pointers can access hardware memory directly, useful for controlling hardware registers.<\/span><\/p>\n
Example:<\/strong><\/span><\/p>\n
\n
int<\/span> *port = (int<\/span> *) 0x4000<\/span>;  \/\/ Pointer to a memory-mapped register<\/span><\/code><\/span>\r\n*port = 1<\/span>;  \/\/ Set the register value to 1<\/span>\r\n<\/code><\/span><\/pre>\n<\/div>\n
6. Pointer Arithmetic<\/strong><\/span><\/h3>\n
Pointers allow arithmetic operations (like incrementing or decrementing) to traverse arrays or other memory blocks efficiently.<\/span><\/p>\n
Example:<\/strong><\/span><\/p>\n
\n
int<\/span> arr[] = {1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>};<\/code><\/span>\r\nint<\/span> *ptr = arr;\r\nprintf<\/span>(\"%d\\n\"<\/span>, *(ptr + 1<\/span>));<\/code><\/span>  \/\/ Prints 2, accessing the second element<\/span><\/code><\/span><\/pre>\n<\/div>\n
7. Pointers to Functions<\/strong><\/span><\/h3>\n
Function pointers allow you to store addresses of functions, enabling callback mechanisms and flexible programming patterns.<\/span><\/p>\n
Example:<\/strong><\/span><\/p>\n
\n
void<\/span> printMessage<\/span>()<\/span> {<\/code><\/span>\r\n    printf<\/span>(\"Hello, world!\\n\"<\/span>);<\/code><\/span>\r\n}<\/code><\/span>\r\nint<\/span> main<\/span>()<\/span> {<\/code><\/span>\r\n    void<\/span> (*funcPtr)() = printMessage;  \/\/ Pointer to 'printMessage'<\/span><\/code><\/span>\r\n    funcPtr();  \/\/ Calls 'printMessage' via the pointer<\/span><\/code><\/span>\r\n    return<\/span> 0<\/span>;\r\n<\/code><\/span>}<\/code><\/span><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Pointer In C Programming Examples | Double Pointer & Use A pointer is also a variable that stores the memory address of another variable. The pointer variable itself also contains the address of memory. Pointers cannot store direct values; they only store memory addresses of where values are located. This is useful for various reasons, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1365,1362],"tags":[],"class_list":["post-11175","post","type-post","status-publish","format-standard","hentry","category-c-pointers","category-c-programming"],"yoast_head":"\nPointer In C Programming Examples | Double Pointer & Use » CS Taleem<\/title>\n<meta name=\"description\" content=\"A pointer is also a variable that stores the memory address of another variable. 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