Arduino Uno ds18b20 and sure 2416 dor matrix display

if i write float TempC = 2250;
show 22500 °C

in serial monitor
show the temperature in this way : 19.4375000000

I think the problem is the decimal

I must divide 19 from 43 without the dot ( or comma )

put 19 into a buffer and the 43 into another buffer

then show it

Right ???

thanks