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split a float in characters

Posted on 1998-09-15
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Last Modified: 2010-04-15
We are programming PIC16c73a with a C-Compiler (PCM). This is normal C without any special libraries.
Now we have a float (18.1235468), we have to output this number serial (I2C - Bus). We want only one number after the the point (18.1) to put this number serial, we need each numbe alone (n1 = 1; n2 = 8; n3 = 1......)
Can anybody help us???

Thank you very much!!
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Question by:zulliger
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11 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 1252727
char n[100];
#include <stdio.h>
char n1,n2,n3,n4;
sprintf(n,"%.1f",18.1235468);
n1 = n[0];
n2 = n[1];
n3 = n[2];
n4 = n[3];
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Expert Comment

by:TheMadManiac
ID: 1252728
char buffer[100];
sprintf(buffer,"%.1f".float_number);

this will give you a buffer which you can send ofcourse use byte by byte :)

hope it helps
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Expert Comment

by:TheMadManiac
ID: 1252729
It seems ozo was earlier with the answer, so i suppose he should get the points. (sorry ozo, but i hadn't even seen your comment :)
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Author Comment

by:zulliger
ID: 1252730
sorry, can someone tell me, how to get the points to the right person??

.. Thank you for your answers!
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LVL 1

Expert Comment

by:TheMadManiac
ID: 1252731
just reject mine, and then ask ozo to answer it, then you can grade it
(also place a comment that ozo should be the only one to post the answer)
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Author Comment

by:zulliger
ID: 1252732
Ozo you can now post the answer...
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LVL 84

Accepted Solution

by:
ozo earned 100 total points
ID: 1252733
Ok.
(although 2 minutes doesn't seem like much difference to exclude one of two identical answers,
we were probably typing at the same time, runnning the program to check syntax,
(although I don't know how my first two lines got swapped pasting it here)
it would seem fairer to me if there were a wayto split the points in such cases)
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Expert Comment

by:TheMadManiac
ID: 1252734
ozo, perhaps you're right, but this way is better than getting someone in the end telling me i stole their points :)
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LVL 11

Expert Comment

by:alexo
ID: 1252735
Ozo, your answer is wrong.  It will corrupt the stack (or other variables) with the terminating zero of the string.  It assumes a  maximum size of the fixed part.  It will not work on any architecture/compiler that choses to align the char variables on a word boudary, rearrange the order of the variables on the stack, put n2, n3 and/or n4 in registers, etc.

TheMadManiac's solution (except the typo - the second period should be a comma) is much safer.
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Expert Comment

by:ozo
ID: 1252736
alexo, MadManiac and I both assumed a maximum size of 100,
which I admit is sloppy, but seems safe enough on the literal constant 18.1235468
On a variable you should check that the magnitude is < 1e96
I made no assumptions about whether n2, n3, n4 are in registers or stacked.
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LVL 11

Expert Comment

by:alexo
ID: 1252737
Ozo, please disregard my comment.  I have no idea what posessed me to write what I did.  (I thought the first argument was n1 and not n.  I'm off to buy a bigger monitor, better glasses and a foot-from-mouth remover.)  Please accept my humble apologies.
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