How to dereference multidimensional Array in C programming? - c

Question

I want to pass a pointer to a multidimensional Array, so the value could be kept not copied. How can I do it? I also keep tracking the int count, will it work every time? The array that I need is memory. The struct has been declared before, outside the main.
struct registers
{
int data;
} registerX, registerY;
void first(int *counter, struct registers* X1, int **m)
{
int value;
printf("Enter the value for the X\n");
scanf("%d", &value);
X1->data = value;
m[*counter][1] = X1->data;
*counter = *counter++;
}
int main()
{
int memory[SIZE][2];
int count = 0;
int choice;
printf("Enter the instruction number:\n");
while(choice != 107)
{
scanf("%d", &choice);
if(choice == 101)
{
memory[count][0] = 101;
first(&count, &registerX, &memory[count][1]);
}

Answer 1

The function signature should be:
void first(int *counter, struct registers* X1, int m[][2])
Or equivalently:
void first(int *counter, struct registers* X1, int (*m)[2])
The call should be:
first(&count, &registerX, memory);

Answer 2

First of all, apart from what Kerrek SB said, you could replace
*counter = *counter++;
with this
(*counter)++;
EDIT: Sorry, I made a mistake trying to say what's wrong with *counter = *counter++, but I got some strange results with the sentence *pointer = *pointer++.
Second, I see that you are using registerX while it's just a type, so you could first do this.
registerX *rgx = NULL;
rgx = malloc(sizeof(registerX));
and use.
first(&count, rgx, memory);
Considering what I said above, this code worked for me.
#include <stdio.h>
#include <stdlib.h>
#define SIZE 5
typedef struct registers {
int data;
} registerX, registerY;
void first(int *counter, struct registers *X1, int m[][2]) {
int value;
printf("Enter the value for the X: ");
scanf("%d", &value);
X1->data = value;
m[*counter][1] = X1->data;
(*counter)++;
return ;
}
int main() {
int memory[SIZE][2];
int count = 0;
int choice;
registerX *rgx = NULL;
rgx = malloc(sizeof(registerX));
printf("Enter the instruction number: ");
while(choice != 107) {
scanf("%d", &choice);
if (choice == 101) {
memory[count][0] = 101;
first(&count, rgx, memory);
printf("Number %d was stored in memory[%d][%d]\n\n", memory[count-1][1], count-1, 1);
}
printf("Enter more instructions: ");
}
return 0;
}