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array[i][j] = counter--; 

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#include <stdio.h>

int main()
{
	int i,j;
	int counter = 0;
	int array[2][3];
	for (i = 0; i < 2; i++)
		for (j = 0; j < 3; j++)
			array[i][j] = ++counter;
	array[i][j] = counter--; //schreiben in nicht reservierten Speicher

	printf("array[0][0] = %d\n", array[0][0]); //1
	printf("array[0][1] = %d\n", array[0][1]); //2
	printf("array[0][2] = %d\n", array[0][2]); //3
	printf("array[1][0] = %d\n", array[1][0]); //4
	printf("array[1][1] = %d\n", array[1][1]); //5
	printf("array[1][2] = %d\n", array[1][2]); //6
}

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for (i = 0; i < 2; i++)
    for (j = 0; j < 3; j++)
    {
        array[i][j] = ++counter;
        array[i][j] = counter--; 
    }