cplusplus:pointers_1_slides
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| cplusplus:pointers_1_slides [2019/03/28 16:14] – mithat | cplusplus:pointers_1_slides [2021/10/19 19:28] – [Pointer operators] mithat | ||
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| ~~NOTOC~~ | ~~NOTOC~~ | ||
| - | ====== Pointers 1 ====== | + | ====== Pointers 1 slides |
| Pointer fundamentals, | Pointer fundamentals, | ||
| Deitel, Harvey M., and Paul J. Deitel. " | Deitel, Harvey M., and Paul J. Deitel. " | ||
| Mithat Konar\\ | Mithat Konar\\ | ||
| - | March 28, 2019 | + | October 19, 2021 |
| ===== Introduction ===== | ===== Introduction ===== | ||
| Line 23: | Line 23: | ||
| ===== Pointer hardware model ===== | ===== Pointer hardware model ===== | ||
| - | Assume an '' | + | * Assume an '' |
| ^ Variable name ^ Memory location ^ Memory contents across all four bytes (32 bits)^ | ^ Variable name ^ Memory location ^ Memory contents across all four bytes (32 bits)^ | ||
| Line 31: | Line 31: | ||
| |::: | |::: | ||
| - | The address of '' | + | * The address of '' |
| ===== Pointer hardware model ===== | ===== Pointer hardware model ===== | ||
| - | A //pointer// variable set to point to '' | + | |
| + | * A //pointer// variable set to point to '' | ||
| ^ Variable name ^ Memory location ^ Memory contents across all 8 bytes (64 bits) ^ | ^ Variable name ^ Memory location ^ Memory contents across all 8 bytes (64 bits) ^ | ||
| - | |'' | + | |'' |
| |::: | |::: | ||
| |::: | |::: | ||
| |::: | |::: | ||
| - | The //value// of the pointer variable is the base address | + | * The //value// of a pointer variable is the base address |
| ===== Pointer visual model ===== | ===== Pointer visual model ===== | ||
| Line 60: | Line 61: | ||
| ===== Pointer syntax basics ===== | ===== Pointer syntax basics ===== | ||
| - | ===== Declaration | + | ===== Pointer declaration |
| * '' | * '' | ||
| * Type of data being pointed to must also be indicated. | * Type of data being pointed to must also be indicated. | ||
| Line 77: | Line 78: | ||
| </ | </ | ||
| - | ===== Declaration | + | ===== Pointer declaration |
| * You can declare more than one pointer variable at a time: | * You can declare more than one pointer variable at a time: | ||
| Line 99: | Line 100: | ||
| * Most environments show base addresses as [[http:// | * Most environments show base addresses as [[http:// | ||
| - | ===== Assignment | + | ===== Pointer assignment |
| * Declare an integer variable '' | * Declare an integer variable '' | ||
| Line 110: | Line 111: | ||
| {{: | {{: | ||
| - | ===== Assignment | + | ===== Pointer assignment |
| * Declare an integer variable '' | * Declare an integer variable '' | ||
| Line 129: | Line 130: | ||
| - | ===== Assignment | + | ===== Pointer assignment |
| - | * Chaning | + | * Changing |
| <code cpp> | <code cpp> | ||
| Line 142: | Line 143: | ||
| </ | </ | ||
| - | ===== Initialization | + | ===== Pinter initialization |
| * Local pointer variables in C++ are not automatically initialized. | * Local pointer variables in C++ are not automatically initialized. | ||
| * Uninitialized pointers point to arbitrary memory. //Very dangerous.// | * Uninitialized pointers point to arbitrary memory. //Very dangerous.// | ||
| Line 154: | Line 155: | ||
| ===== nullptr/ | ===== nullptr/ | ||
| - | * You can set a pointer to a value that indicates that it is //pointing to nothing//: '' | + | * You can set a pointer to a value that indicates that it is //pointing to nothing//: '' |
| - | * Otherwise uninitialized pointers should be set to '' | + | * Otherwise uninitialized pointers should be set to '' |
| <code cpp> | <code cpp> | ||
| Line 164: | Line 165: | ||
| * '' | * '' | ||
| - | ===== Pointer operators | + | ===== Operators for pointers |
| - | * **address operator** ''&'' | + | * **address operator** ''&'' |
| - | * **indirection** or **dereferencing operator** '' | + | * **indirection** or **dereferencing operator** '' |
| ===== Indirection/ | ===== Indirection/ | ||
| - | * **indirection** or **dereferencing** operator, '' | + | * **indirection** or **dereferencing** operator, '' |
| <code cpp> | <code cpp> | ||
| Line 181: | Line 182: | ||
| ===== Indirection/ | ===== Indirection/ | ||
| - | * Dereferencing can be used to assign a value to a location in memory: | + | |
| <code cpp> | <code cpp> | ||
| Line 189: | Line 190: | ||
| *myPtr = 7; // change value in y to 7 | *myPtr = 7; // change value in y to 7 | ||
| cout << y; // prints 7</ | cout << y; // prints 7</ | ||
| - | |||
| - | ===== Indirection/ | ||
| * You can think of the indirection/ | * You can think of the indirection/ | ||
cplusplus/pointers_1_slides.txt · Last modified: 2021/10/19 19:29 by mithat