/* input a 2D array from a file, then output values from a 2D array to a file,
	but in reverse column-order  */

#include<stdio.h>

int main()
{
	int i, j;
	float values[3][4];
	FILE *fptr;

	/* first, input the data as usual */
	fptr = fopen("05_input.dat", "r");

	for (i=0; i<3; i++)
		for (j=0; j<4; j++)
			fscanf(fptr, "%f", &values[i][j]);

	fclose(fptr);


	/* now, output the data.  However, we'll reverse the
		row loop */

	fptr = fopen("07_output.txt", "w");

	/* print out the values */
	for (i=0; i<3; i++)
	{
		for (j=3; j>=0; j--)
		{
			fprintf(fptr, "%4.2f ", values[i][j]);
		}
		fprintf(fptr, "\n");
	}

	fclose(fptr);
}