num2Str example AX 2012/Dynamics 365

Below is sample example for the function num2str

static void dtformatNum(Args _args)
{
    real lineNum = 5.69;
    int d = 0;
    ;
    while ((d < 10) && (lineNum != str2num( num2str(lineNum,1,d,1,0) ) ))
        d++;

    info(num2str(lineNum, 1, d, 1, 0));

}