Listing 9 3 TwoDimensionalArrayPointers

/* Listing 9-3. Modified two-dimensional array program to use pointers.

  Purpose: To illustrate the relationship between two-dimensional
    arrays and pointers.
    
    Dr. Purdum, December 21, 2014
  */
#define DAYSINWEEK 7
#define CHARSINDAY 10

void setup() {
  Serial.begin(9600);
}

void loop() {
  static char days[DAYSINWEEK][CHARSINDAY] =
     {"Sunday", "Monday", "Tuesday","Wednesday",
      "Thursday", "Friday", "Saturday"};

  int i, j;          // Note the dual definitions in one statement 
  char *ptr, *base;  // Some programmers hate these. Your choice.

  base = days[0];    // Different for N-rank arrays where N > 1

  for (i = 0; i < DAYSINWEEK; i++) {
    ptr = base + (i * CHARSINDAY);
    Serial.print((int) ptr);  // Show the lvalue
    Serial.print(" ");
    for (j = 0; *ptr; j++) {
      Serial.print(*ptr++);    // Show one char
    }
    Serial.println();
  }
  Serial.flush();
  exit(0);
}