+ 12

How memory is allocated for multidimensional arrays in c and different languages?

if you know explain briefly

16th Mar 2017, 5:53 PM
SUJITH
SUJITH - avatar
2 ответов
+ 5
In C, you allow a memory space of a certain size (which create a mono dimensional array). As for what you put as a value of your array, it is of your choice. If you put an array as the array's value, then it will create a two dimensional array, and you can continue like that recursively. In C#, multi dimensional arrays ([,], [,,], ...) are in fact just one array and when you enter the indexes, the language translate them in a unique index which will be the corresponding for the uni dimensional array. Other multi dimensional arrays ([][], [][][],...) are like in C. In C++, it is the same as in C. There are no arrays in python, all there is are lists. I am not sure for other languages but I assume that it is the same but it is hidden.
16th Mar 2017, 7:19 PM
Baptiste E. Prunier
Baptiste E. Prunier - avatar
0
In most programming languages there are no multidimensional arrays (C, C++, Java, Javascript, PHP. I don't know the others). However, arrays are supported that contain more arrays which is a way to "simulate" multidimensional arrays. This means that the array contains references or pointers to other arrays. These arrays can have different sizes, like { {1, 2, 5}, {3, 3}, {5, 2, 2, 4} } Another way to "simulate" a two-dimensional array is to store the values in a one-dimensional array and remember the width and height. Instead of { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} } just write {1, 2, 3, 4, 5, 6, 7, 8, 9} To get the value at row 2 column 2, you can calculate the proper index in the one-dimensional array: index = row * width + column in this example: index = 1 * 3 + 1 = 4; //remember to start counting at 0
16th Mar 2017, 7:32 PM
Ludwig Stecher
Ludwig Stecher - avatar