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I have a problem with a project. I have to make a variable size 2D array for storing some prediction error..so this is about images. The trouble is that I have to load images of different sizes so for each image I would have to get into a file the 2D array with the coresponding number of pixels..I've searched among your questions but it's not what I'm looking for.Can anyone help me?
Thank you
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We can declare a two-dimensional integer array say 'x' of size 10,20 as: int x[10][20]; Elements in two-dimensional arrays are commonly referred to by x[i][j] where i is the row number and 'j' is the column number.
To declare a 2D array, specify the type of elements that will be stored in the array, then ( [][] ) to show that it is a 2D array of that type, then at least one space, and then a name for the array. Note that the declarations below just name the variable and say what type of array it will reference.
Variable length arrays is a feature where we can allocate an auto array (on stack) of variable size. It can be used in a typedef statement. C supports variable sized arrays from C99 standard.
We can pass the 2D array as an argument to the function in C in two ways; by passing the entire array as an argument, or passing the array as a dynamic pointer to the function.
If you have a modern C compiler (at least C99) in function scope it is as simple as:
unsigned arr[n][m];
this is called a variable length array (VLA). It may have problems if the array is too large. So if you have large images you could do:
unsigned (*arr)[m] = malloc(sizeof(unsigned[n][m]));
and later
free(arr);
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