[Pointer Access Operators]
Referencing is one of the features specifically for use with pointers. The ampersand operator
& is used for this purpose. If
x is a variable, then
&x represents the address of the variable
int *p; // declare a pointer to an int data type int i = 5; int result = 0; p = &i; // now 'p' contains the address of 'i' result = *p; // 'result' gets the value at the address pointed by 'p' // i.e., it gets the value of 'i' which is 5
Pointers are one of the complicated subjects for beginners in learning C, and it is possible to write the vast majority of Arduino sketches without ever encountering pointers. However for manipulating certain data structures, the use of pointers can simplify the code, and knowledge of manipulating pointers is handy to have in one’s toolkit.
- [Definition] Pointers
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The text of the 86Duino reference is a modification of the Arduino reference and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.