#include<stdio.h>

int xd, yd;
void *vpCoord;

void testfunc(){
	char (*pCoord)[xd][yd] = (char (*)[xd][yd])vpCoord;
	(*pCoord)[3][8] = 100;
}

int main(){
	xd = 10;
	yd = 10;
	char coord[10][10];
	vpCoord = &coord;
	testfunc();
	printf("coord[3][8] = %d\n", coord[3][8]);

	return 0;
}