extract the integer part of the real number

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fasmnewbie

Joined: 01 Mar 2011
Posts: 555

fasmnewbie 08 Nov 2015, 08:04

mns wrote:

thank you fasmnewbie for your valuable insights.
by the way i thought in c it's compiler first convert the source to assembly code before generating the machine code.if that's correct that mean if we use c, we use someone's assembly routines(no offence for c programmers) over and over again without understanding really what's happening?
actually, i like c also and trying to learn it in these days side by side with assembly.

Good for you. In the hand of a crafty programmer, a C program can be a very powerful tool. For example, many assembly programmers do rely on C people to write them debugging code so that they can see what's wrong with their own so-called 'low-level' assembly code. Just can't live without it.

But in your particular case, no debugger out there can help you because all FPU environment (stack, control flags, status flags, tag words, fxam) shows normal output on the debugger. You just have to gain more technical knowledge on FPU. Read "Simply FPU" by Raymond. Highly recommended.

08 Nov 2015, 08:04

mns

Joined: 20 Dec 2007
Posts: 150
Location: Piliyandala,Sri lanka

mns 08 Nov 2015, 11:21

thanks fasmnewbie.
i'm already using SIMPLY FPU and it is very easy to understand. Smile

08 Nov 2015, 11:21

AsmGuru62

Joined: 28 Jan 2004
Posts: 1708
Location: Toronto, Canada

AsmGuru62 08 Nov 2015, 11:43

@fasmnewbie:
Great insights, but I respectfully disagree about the debugger.
When you load ST0 with "4789640.889" the debugger must show ST0 as 4789640.889.
And if ST0 shows 4789641.000000000 - then something is strange about the declaration of the variable.
So, I think, debugger always helps.

08 Nov 2015, 11:43

fasmnewbie

Joined: 01 Mar 2011
Posts: 555

fasmnewbie 10 Nov 2015, 13:35

AsmGuru62 wrote:

@fasmnewbie:
Great insights, but I respectfully disagree about the debugger.
When you load ST0 with "4789640.889" the debugger must show ST0 as 4789640.889.
And if ST0 shows 4789641.000000000 - then something is strange about the declaration of the variable.
So, I think, debugger always helps.

Guru, I don't want to extend the argument with you. You are my favorite guru. I was once as confused as mns when you and others came to my rescue and attended to my beginners questions Very Happy

10 Nov 2015, 13:35

mns

Joined: 20 Dec 2007
Posts: 150
Location: Piliyandala,Sri lanka

mns 01 Dec 2015, 11:51

thank you very much guys.with the valuable opinions and ideas of you all i manage to write a programme which can out put floating point value to the screen.
it can write only(had to make the limitation to have the correct number) floating point values below 999999999999999999.0 up to 4 decimals.
i hope you have time to suggest corrections and improvements.thank you

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01 Dec 2015, 11:51

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