Arduino Uno - EEPROM locations not consistant -

i trying write items eeprom , later read them out. finding reading not getting same put in @ times. narrow down example can show you. below read variables 2 address.

const int start_add_type = (eeprom.length() - 10); const int start_add_id = (eeprom.length() - 4); 

i @ value (via rs232)

serial.begin(9600); serial.println(start_add_type); serial.println(start_add_id); 

of them @ start of setup() , see get

 1014  1020 

i again @ end

serial.println(start_add_type); serial.println(start_add_id); 

and get

1014 818 

i cannot see why should change. did try calling them const e.g. const

const int start_add_type = (eeprom.length() - 10); const int start_add_id = (eeprom.length() - 4); 

but gave same result. here sit puzzled @ must have missed. got idea?

#include "eeprom.h"   int start_add_type = (eeprom.length() - 10); int start_add_id = (eeprom.length() - 4); char id[7] = "encpg2"; char stored_id[5]; char input[10]; //string type;  void setup() {   serial.begin(9600);    serial.println(start_add_type);   serial.println(start_add_id);   // start_add = (eeprom.length() - 10);                      // use method pcb independent.     (int = 0; < 6; i++)   {     stored_id[i] = eeprom.read(start_add_type + i);             // read id eeprom.    }    if (stored_id != id)                                    // check if 1 have got same 1 in code id[7]   {     (int = 0; < 6; i++)     {       eeprom.write(start_add_type + i, id[i]);                 // write     id eeprom.     }   } serial.println(start_add_type); serial.println(start_add_id); }   void loop() { } 

you overwriting memory in loop:

for (int = 0; < 6; i++) {     stored_id[i] = eeprom.read(start_add_type + i);   } 

stored_id array 5 bytes long, writing stored_id[5] rewrite start_add_id variable, weird value 818, equals 0x0332 hex , 0x32 '2' character of id

for fixing issue, declare stored_id in way:

char stored_id[6];