Simple way to pass 2d arrays to a C function.

2d-arrays.c

#include <stdio.h>

#define ARRAY_SIZE 10

int test(int* array, int ys, int xs) {
	int desiredx = 5;
	int desiredy = 3;

	array[desiredy * xs + desiredx] = 1;
	array[desiredy * ys + desiredx] = 2;
}

int main() {
	int test_array[ARRAY_SIZE][ARRAY_SIZE];

	// Clear array
	for (int y = 0; y < ARRAY_SIZE; y++) {
		for (int x = 0; x < ARRAY_SIZE; x++) {
			test_array[y][x] = 0;
		}
	}
	
	// Call the test function
	test(&test_array[0][0], ARRAY_SIZE, ARRAY_SIZE);

	// Print array
	for (int y = 0; y < ARRAY_SIZE; y++) {
		for (int x = 0; x < ARRAY_SIZE; x++) {
			printf("%d", test_array[y][x]);
		}
		printf("\n");
	}
}