convert define string to char code example

Example 1: string to char*

std::string str = "string";
const char *cstr = str.c_str();

Example 2: java convert a string to char[]

String string =  "ABCDEF" ;
 
char[] charsFromString = string.toCharArray(); // { 'A', 'B', 'C', 'D', 'E', 'F' }