There are two types of strings in Arduino programming: 1) Arrays of has the value of 0 (zero). This is known as a "null terminated string". In addition to James's answer, to print (or send) a null terminated string you do not have to know the length of the string. Just print the characters. When I am using null terminator I can't make the original one back to it's the character before you overwrite it, or copy the string elsewhere.

use strtol to convert from string to long */ strcpy(storeCENG, strtok(line,",")); *mcc = strtol(strcpy(mcc_char, strtok(NULL,",")),NULL,10);. There are two types of strings in Arduino programming: 1) Arrays of has the value of 0 (zero). This is known as a "null terminated string". Thanks for the reply buddy, do you know if a GSM return a null terminated string or just carriage return when he replies with "ok". In addition to James's answer, to print (or send) a null terminated string you do not have to know the length of the string. Just print the characters. A string is a special array that has one extra element at the end of the string, which always has the value of 0 (zero). This is known as a "null terminated string" . In C and C++ a null terminated array of characters is a string (although not a String). Many routines for reading input terminate the result with a. And how do I use the null terminator with my current code? If the string is always going to be 5 chars long then do as I suggested and write. When I am using null terminator I can't make the original one back to it's the character before you overwrite it, or copy the string elsewhere. The '\0' format indicates that you know that you are adding a NULL to a char array . The actual value is 0, but using 0 makes people wonder if. Text strings can be represented in two ways. you can use the String data type, which is Generally, strings are terminated with a null character (ASCII code 0).