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 Index > Tutorials and Examples > FPU example with accuracy up to 8 digits
Author
CampTheBoss

Joined: 02 Feb 2015
Posts: 42
Location: A chair
CampTheBoss 10 Mar 2015, 18:53
Hey, it's me. I just want to show you the latest project I have done; I used the FPU to calculate division up to 8 digits. Here is the source if you want to have a look at it.
Code:
```format PE console 6.0
include 'win32a.inc'
entry start

format_f db "%2.8f",10,0
val1 dd 1,0
val2 dd 4,0
decnum dd 1110000.0,0
decnum2 dd 0.2,0
divnum dd 1000000.0,0

start:
push 5
finit
fild dword[esp]
fst st1
fmul st0,st1
fmul st0,st0
fdiv dword[divnum]
fnop    ;Mnemonic for "FPU no operation"
sub esp,4
fstp qword[esp]
push format_f
call [printf]
invoke ExitProcess,0

library msvcrt,'msvcrt.dll',\
kernel,'kernel32.dll'

import msvcrt,\
printf,'printf'

import kernel,\
ExitProcess,'ExitProcess'
```

If there is anything i should improve, give me feedback
10 Mar 2015, 18:53
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20142
revolution 11 Mar 2015, 01:10
One thing to note about single precision floating point numbers in IEEE754 format is that they don't provide 8 digits of precision. The most you can achieve is 7 decimal digits because the mantissa is only 23+1 bits.

Also, what is the purpose of the fnop?
11 Mar 2015, 01:10
CampTheBoss

Joined: 02 Feb 2015
Posts: 42
Location: A chair
CampTheBoss 11 Mar 2015, 20:11
aah is that why i always get a '15' for no reason? First about the single precision floating-point thing: i use over 8 digits so i can see the whole result, I have already read about the FPU and know about that . about the fnop.. I just put it in for no reason o.o
11 Mar 2015, 20:11
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