/*
 * SelfTest1.3.c
 * Chapter 7
 * John Stile
 * Purpose:  Modify a previous program to produce the following output:
 *                        Aa
 *                      AaBb
 *                    AaBbCc
 *                  AaBbCcDd
 *                AaBbCcDdEe
 *              AaBbCcDdEeFf
 *            AaBbCcDdEeFfGg
 *          AaBbCcDdEeFfGgHh
 *        AaBbCcDdEeFfGgHhIi
 *      AaBbCcDdEeFfGgHhIiJj
 *    AaBbCcDdEeFfGgHhIiJjKk
 *  AaBbCcDdEeFfGgHhIiJjKkLl
 *AaBbCcDdEeFfGgHhIiJjKkLlMm
 *           
 *      I choose to modify forloop6.c 
 */
#include <stdio.h> // include functions in stdio.h when compiling
#define NUM 13      // Set macro NUM to be replaced by 13
#define SPACES "  " // Two spaces inside double quotes
#define CHARS "!!" // Two exclamination points inside double quotes

int main(void)
{
  int ii,jj;

  for(ii=0; ii<= NUM; ii=(ii+1) ) // Loop through 13 letters of the aphabet
  {
    for(jj=NUM; jj>ii; jj=jj-1) // We want to create spaces
                                // Each iteration adds one more space
                                // stop when we reach 13
    {
      printf("%s", SPACES); // print a space
    }
    for(jj=0; jj<ii; jj=(jj+1) ) // Add letters A to M
                                 // Each line adds prvious+next 
    {
      printf("%c%c", (65+jj) ,(32+65+jj) ); // print ascii upper and lower case of letters
    }
    
    printf("\n"); // Add a newline at end of loop
  } 
  return 0;  // return 0 to calling program
}