This is how float works in pawn or in c++, so what i said that should be ok internally seems wrong.
You can read those interesting thread :
https://forums.alliedmods.net/showthread.php?t=53543
https://forums.alliedmods.net/showthread.php?t=53535
https://forums.alliedmods.net/showthread.php?t=47051
Anyway, in your case, multiply all by 10 and you can works with integers.
And if you want to print as Float, you can trick it like this :
PHP Code:
static iNumber = 800; // instead of 80.0
new szNumber[32];
new len = formatex(szNumber, cm(szNumber), "%d", ++iNumber); // add 1 instead of 0.1
szNumber[len] = szNumber[len-1];
szNumber[len-1] = '.';
client_print(id, print_chat, szNumber);