Thread: Error in showMatrix function.

On the very last row of showMatrix I get an error that says: error C2109: subscript requires array or pointer typ. How do I fix this.

Code:

#ifndef _MATRIX_H_
#define _MATRIX_H_

struct matrix
{
	int * mat;
	int numRows;
	int numColumns;
};

void createMatrix(struct matrix * m);
void destroyMatrix(struct matrix * m);
void showMatrix(struct matrix * m);

#endif

/////////////////////////////////////////////////////////////////////

#include <stdlib.h>
#include <stdio.h>
#include "Matrix.h"

void createMatrix(struct matrix * m)
{
	int i;
	int j;
	printf("Enter dimensions.\n");
	printf("Rows: ");
	scanf("%d", &m->numRows);
	printf("Columns: ");
	scanf("%d", &m->numColumns);
	printf("Enter matrix values.\n");
	m->mat = (int *) malloc(m->numRows * m->numColumns * sizeof(int));
	for (i = 0; i < m->numRows; i++)
		for (j = 0; j < m->numColumns; j++)
			scanf("%d", &m->mat[i * m->numColumns + j]);
}

void destroyMatrix(struct matrix * m)
{
	free(m->mat);
}

void showMatrix(struct matrix * m)
{
	int i;
	int j;
	for (i = 0; i < m->numRows; i++)
		for (j = 0; j < m->numColumns; j++)
			printf("matrix[%d][%d] = %d\n", m->numRows, m->numColumns, m->mat[m->numRows][m->numColumns]);
}

Compiler: MS Visual Studio.net
OS: Windows XP Pro sp1

Oh I see now what I did wrong, thanks.