I don't know for the ITDB02 library, but with the UTFT library there are the functions:
printNumI(num, x, y [, length [, filler]]);
printNumF(num, dec, x, y [, divider [, length [, filler]]]);
You use like that, for example:
myGLCD.printNumI( myInt, CENTER, 5, 4, ' ');
myGLCD.printNumF( myFloat, 1, CENTER, 5, '.', 4, ' ' );
The filler parameter is the thing you need to erase the previously displayed character ![]()