cplusplus:pointers_2_slides
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cplusplus:pointers_2_slides [2021/10/19 19:34] – [Calling functions by reference] mithat | cplusplus:pointers_2_slides [2021/10/19 19:42] – [Pointers as function parameters] mithat | ||
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* Arguments can be anything that can be assigned to a pointer (i.e., addresses or pointers). | * Arguments can be anything that can be assigned to a pointer (i.e., addresses or pointers). | ||
- | ===== Pointers as function parameters | + | ===== Example |
<file cpp function-with-pointer.cpp> | <file cpp function-with-pointer.cpp> | ||
/** Demonstrates how to pass pointers to functions. */ | /** Demonstrates how to pass pointers to functions. */ | ||
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* Pointers can be used to implement //pass by reference// in functions. | * Pointers can be used to implement //pass by reference// in functions. | ||
* The '' | * The '' | ||
- | | + | * Strictly speaking, the passing mechanism is //call by value//. But functionality is pass by reference. |
- | | + | * Syntax |
- | * The syntax | + | |
- | ===== Calling functions by reference | + | ===== Example |
<file cpp cube-by-reference.cpp> | <file cpp cube-by-reference.cpp> | ||
/** Cube a variable using pass by reference with a pointer. */ | /** Cube a variable using pass by reference with a pointer. */ | ||
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void cubeByReference(int *nPtr) | void cubeByReference(int *nPtr) | ||
{ | { | ||
+ | // *nptr'' | ||
*nPtr = (*nPtr) * (*nPtr) * (*nPtr); // parenthesis for readability | *nPtr = (*nPtr) * (*nPtr) * (*nPtr); // parenthesis for readability | ||
} | } | ||
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* A **constant pointer** is a pointer whose value cannot change. | * A **constant pointer** is a pointer whose value cannot change. | ||
- | * Constant pointers store a memory location that cannot be changed. | + | * Constant pointers |
* Must be initialized when declared. | * Must be initialized when declared. | ||
- | * Use the '' | + | * '' |
<code c++> | <code c++> |
cplusplus/pointers_2_slides.txt · Last modified: 2021/10/19 19:46 by mithat