test.ino

#include <avr/pgmspace.h>

prog_char string_0[] PROGMEM = "String 0";   // "String 0" etc are strings to store - change to suit.
prog_char string_1[] PROGMEM = "String 1";
prog_char string_2[] PROGMEM = "String 2";
prog_char string_3[] PROGMEM = "String 3";
prog_char string_4[] PROGMEM = "String 4";
prog_char string_5[] PROGMEM = "String 5";
char buffer[30];

PROGMEM prog_char *string_table[] =      // change "string_table" name to suit
{   
  string_0,
  string_1,
  string_2,
  string_3,
  string_4,
  string_5 };

PROGMEM  prog_char *string_table1[] = 	   // change "string_table" name to suit
{   
  string_5,
  string_4,
  string_3,
  string_2,
  string_1,
  string_0 };

int count=0;

 prog_char **charPtr;
void setup()			  
{
  Serial.begin(9600);
}
void loop()			  
{
  /* Using the string table in program memory requires the use of special functions to retrieve the data.
   The strcpy_P function copies a string from program space to a string in RAM ("buffer"). 
   Make sure your receiving string in RAM  is large enough to hold whatever
   you are retrieving from program space. */
  if(count%2==0){
    charPtr = &(string_table[0]);
  }
  else{
    charPtr =  &(string_table1[1]);
  }
//  Serial.println(charPtr);
//  Serial.println(string_table[0]);
  Serial.println("======");
  strcpy_P(buffer, (char*)pgm_read_word((charPtr)));
  Serial.println( buffer );
//  Serial.println("====");
  delay( 500 );
  //  for (int i = 0; i < 6; i++)
  //  {
  //    strcpy_P(buffer, (char*)pgm_read_word(&(string_table[i]))); // Necessary casts and dereferencing, just copy. 
  //    Serial.println( buffer );
  //    delay( 500 );
  //  }
  count++;
}