/*****************************************************************************\
 * Exercise 8-1: a program that prints a grid from user-entered dimensions
 *
 * Author: Suzi Anvin
 *
 * Purpose: practice using for statements in C
\*****************************************************************************/

#include <stdio.h>

int main()
{
  char line[50];
  int width = 0;		/* user selected width of grid */
  int height = 0;		/* heigth of grid */
  int i;			/* counters */
  int j;
  int k;
  int l;
  char noquit;			/* y or n to restart program */

  /* getting user dimensions for grid */
  for (;;) {
    printf("Enter the size of desired grid A x B : ");
    fgets(line, sizeof(line), stdin);
    sscanf(line, "%d %*[^-0-9] %d", &width, &height);
    /* limiting grid size */
    if (width > 12 || width <= 0 || height > 12 || height <= 0 ) { 
      printf("Please enter positive values of 12 or smaller.\n");
      continue;			/* re-input dimensions */
    }
    /* setting up the loop to draw a grid of the specified height, 
     * avoiding the fencepost error by using height + 1 */
    for (i = 0; i < (height + 1); i++) {

      /* setting up loops to draw a grid of the specified width.  */
      for (j = 0; j < width; j++) {
	/* print height + 1 vertical lines that are width long */
	putchar('+');		
        for (k = 0; k < 5; k++) {
	  putchar('-');
	}
      }
      putchar('+');
      putchar('\n');

      /* setting up loop to draw the vertical sides */
      if (i < height) {
	for (l = 0; l < 3; l++) {
	  for (j = 0; j < width; j++) {
	    putchar('|');
	    for (k = 0; k < 5; k++) {
	      putchar(' ');
	    }
	  }
	  putchar('|');
	  putchar('\n');
	}
      }
    }
    printf("Would you like to print another grid? (y/n): ");
    fgets(line, sizeof(line), stdin);
    sscanf(line, "%c", &noquit);
    if (noquit == 'y')
      continue;
    else
      break;
  }
  return (0);
}