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A multidimensional array question in C:
I need to create a 2D array as follows:
A 2 dimensional array can be malloced. Inside each value i.e. array[1][1] I need another 1 dimensional array that can hold 2 integers and a pointer to another array that will hold sepearate values.
How would I implement this?
s
O 30 io int | int |
Expert Answer
typedef struct my_struct{
int a[2];
int *ptr;
} STRUCT;
STRUCT** alocate(int row, int col) {
STRUCT** arr;
int i;
arr = (STRUCT**)malloc(sizeof(STRUCT*) * row);
for (i = 0; i < row; i++) {
arr[i] = (STRUCT*)malloc(sizeof(STRUCT) * col);
}
}
/*
row = 2, col = 4
malloc(sizeof(STRUCT*) * row);
==========
| |
| |
| arr[0] |
| |
==========
| |
| |
| arr[1] |
| |
==========
for (int i = 0; i < row; i++) {
arr[i] = (STRUCT*)malloc(sizeof(STRUCT) * col);
========== ========================================
| | | | | | |
| <==============| | | | |
| arr[0] | |arr[0][0]|arr[0][1]|arr[0][2]|arr[0][3]|
| | | | | | |
========== =========================================
| | | | | | |
| <==============| | | | |
| arr[1] | |arr[1][0]|arr[1][1]|arr[1][2]|arr[1][3]|
| | | | | | |
========== ==========================^==============
|———–int, int, int*
*/
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