Apprendre Connexion entre Tableaux et Pointers

Arrays and pointers are closely connected. The name of an array can be treated as a pointer to its first element.

main.cpp


              12345678
            
#include <iostream>

int main()
{
	int arr[5] { 12, 21, 27, 10, 11 };
	// Using dereference operator (`*`) to access the value
	std::cout << *(arr);
}

Arrays are typically formed by arranging elements in contiguous memory blocks, where each element is stored in consecutive memory locations. This enables the application of pointer arithmetic to access any element within the array.

main.cpp


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#include <iostream>

int main()
{
    float arr[5] { 2.7, 9.9, 1.0, 0.3, 2.2 };
    std::cout << arr[3] << std::endl;
 	std::cout << *(arr + 3) << std::endl;
}

In fact, the compiler automatically performs this operation. It translates array brackets into the dereference operator with pointer arithmetic with an array name. This implies that the order can be changed, allowing the index to be placed outside the brackets while the array name remains inside the brackets (index[array_name]).

main.cpp


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#include <iostream>

int main()
{
    float arr[5] { 2.7, 9.9, 1.0, 0.3, 2.2 };
    std::cout << 3[arr] << std::endl;
}

Note

Stick to conventional syntax for clarity, this form may confuse unfamiliar readers.

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Section 2. Chapitre 3

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Arrays and pointers are closely connected. The name of an array can be treated as a pointer to its first element.

main.cpp


              12345678
            
#include <iostream>

int main()
{
	int arr[5] { 12, 21, 27, 10, 11 };
	// Using dereference operator (`*`) to access the value
	std::cout << *(arr);
}

main.cpp


              12345678
            
#include <iostream>

int main()
{
    float arr[5] { 2.7, 9.9, 1.0, 0.3, 2.2 };
    std::cout << arr[3] << std::endl;
 	std::cout << *(arr + 3) << std::endl;
}

main.cpp


              1234567
            
#include <iostream>

int main()
{
    float arr[5] { 2.7, 9.9, 1.0, 0.3, 2.2 };
    std::cout << 3[arr] << std::endl;
}

Note

Stick to conventional syntax for clarity, this form may confuse unfamiliar readers.

Tout était clair ?

Merci pour vos commentaires !

Section 2. Chapitre 3