Citer : Posté le 10/11/2020 08:51 | #

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There are two main ways to use arrays in C

The first is to allocate the array on the stack - this is useful for smaller arrays. The size of the array must be known at compile time, through constants or literals. The declaration is <type> <name>[<size>][<size2>][<size3>] ... for arrays of any dimension.
They can be initialised through a literal upon declaration (in which case the size can be omitted), e.g. int arr[] = {0, 1, 2, 3, 4}; or char arr[2][3] = { {'a', 'b', 'c'}, {'d', 'e', 'f'} };.
They can also have each element set individually, in which case the initial data will be garbage, e.g.

The second is to allocate memory on the heap for an array. This is the better way to do it for large arrays or arrays where the size is not known at compilation time. The declaration is <type> *<name> = malloc(<size> * <size2> * <size3> ... * sizeof(<type>)) for arrays of any dimension.
One-dimensional arrays of this type can be accessed as normal, e.g.

The downside of using the heap to store an array (or indeed passing an array to any function, which will decay it into a pointer to that array) is that the array is always one-dimensional, therefore multi-dimensional arrays must be manually accessed, e.g.

You must also manually free allocated arrays when you are finished with them, through free(<name>).

These are the basics of the main types of array, there are nuances with more complex arrays such as arrays of pointers to allocated objects, but for basic types this should cover you.

(These resources are in English, feel free to translate or find some in French )
https://www.tutorialspoint.com/cprogramming/c_arrays.htm
https://www.embedded.com/allocating-arrays/

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Citer : Posté le 10/11/2020 13:17 | #

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donc je suis obligé d'utiliser malloc? ou je peu utiliser ma technique?

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