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ye
Joined: 11 May 2005
Posts: 57
Location: london
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| A strange problem... |
 Posted: Fri Oct 21, 2005 5:53 am |
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Hi, all,
I post this strange thing here and hope ppl help
| Code: |
void StopConditionExamination( void )
{
int count_loop;
const char bottom[22]=" CANCEL NEXT ";
/*
fprintf(COM_B,"\n*****I am here 1******\n");
fprintf(COM_B,"\nTEtest_done = %d\n",TEtest_done);
fprintf(COM_B,"\nTEtest_checkfit = %d\n",TEtest_checkfit);
fprintf(COM_B,"\nmode = %d\n",mode);
*/
///////////////////////////////////////////////////////////////
////////////// Successful Test Done! /////////////////
///////////////////////////////////////////////////////////////
if( (lastresult == IPCOMMS_LASTRESULT_VALIDRESULT) && (last_mode == MODE_TEDATACOLLECT) )
{
TEtest_timeout = 0;
TEtest_done = 1;
TEtest_stop = 0;
TEtest_cancel = 0;
TEtest_checkfit = 0;
fprintf(COM_B,"\n*****I am here 2******\n");
fprintf(COM_B,"\nTEtest_done = %d\n",TEtest_done);
fprintf(COM_B,"\nTEtest_checkfit = %d\n",TEtest_checkfit);
fprintf(COM_B,"\nmode = %d\n",mode);
}
///////////////////////////////////////////////////////////////
////////// Stimulus level falls out of range //////////
///////////////////////////////////////////////////////////////
else if( (((targetstimoklevel - targetstimokrange) > stimdb) || ((targetstimoklevel + targetstimokrange) < stimdb))
&& (mode == MODE_TEDATACOLLECT) )
{
/*
fprintf(COM_B,"\n*****I am here 3******\n");
fprintf(COM_B,"\nTEtest_done = %d\n",TEtest_done);
fprintf(COM_B,"\nTEtest_checkfit = %d\n",TEtest_checkfit);
fprintf(COM_B,"\nmode = %d\n",mode);
*/
TEtest_timeout = 0;
TEtest_done = 0;
TEtest_stop = 0;
TEtest_cancel = 0;
TEtest_checkfit = 1;
}
fprintf(COM_B,"\n*****I am here 4******\n");
fprintf(COM_B,"\nTEtest_done = %d\n",TEtest_done);
fprintf(COM_B,"\nTEtest_checkfit = %d\n",TEtest_checkfit);
fprintf(COM_B,"\nmode = %d\n",mode);
....................................................
....................................................
}
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The code above is basically a single function. I hide other part of the function and only 2 IF statements are given here. You can see there are groups of FPRINTFs around. They are for testing purpose and do not impose any significance to the actual operation of the code.
Fundamentally, you can see conditions of the 2 IF statements are irrelevant and the variables in the conditions are all global variables.
The weird thing is here:
When this function is called, conditions for the 1st IF are met and those for the 2nd one are not met at all. So supposedly, the result should be:
TEtest_done =1;
TEtest_checkfit = 0;
However the result I got from Hyperterminal is:
TEtest_done =1;
TEtest_checkfit = 1;
The strange thing here is:
Since the 1st IF works and the 2nd one doesn't, TEtest_checkfit shouldn't be 1 !! It apears like the 2nd IF works when conditons are not met at all! Even if the 2nd IF works, it is impossible for both variables to be 1. But I can say the second IF didn' work by looking at the hyperterminal.
The even more strange thing is:
The problem can only solved by putting the second group of FRINTFs, i.e., the group begins with 'I am here 2'. As long as they are there, the problem is gone and TEtest_checkfit becomes 0; as soon as I comment them out, problem happens!
People, please help! I am so puzzled! |
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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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| Posted: Fri Oct 21, 2005 7:25 am |
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Take out the else statement and replace it for another single if.
I canīt see any correspondence in the variables involved inside the two if statements
for being using else statement. Donīt see why should be exclusive.
Would be like this:
| Code: |
if( (lastresult == IPCOMMS_LASTRESULT_VALIDRESULT) && (last_mode == MODE_TEDATACOLLECT) )
{
.......
.......
}
if( (((targetstimoklevel - targetstimokrange) > stimdb) || ((targetstimoklevel + targetstimokrange) < stimdb))
&& (mode == MODE_TEDATACOLLECT) )
{
.......
.......
}
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Humberto |
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ye
Joined: 11 May 2005
Posts: 57
Location: london
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| Posted: Fri Oct 21, 2005 8:01 am |
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I can't take awy the else here.
Before continue, I am wondering whether a loop like
if()
else if()
else if()
can only alow only IF to be executed like SWITCH CASE does?
If the answer is yes, i must keep the ELSE because though the conditons in the IF statements are totally irrelevant, at a time the code only alow one event to happen. If more than one event happens simultaneously, i,e,, two IFs are met, the operation of the code will be messed up. |
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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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| Posted: Fri Oct 21, 2005 8:15 am |
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| Quote: |
If more than one event happens simultaneously, i,e,, two IFs are met, the operation of the code will be messed up.
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The code posted didnīt give us enough visibility to know what your intention is, but if the quoted phrase is true, you must use a switch() and NOT the else statement.
Humberto |
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ye
Joined: 11 May 2005
Posts: 57
Location: london
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| Posted: Fri Oct 21, 2005 9:04 am |
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thanks humberto,
...................................
Let's forget about IF or SWITCH here and go back to the problem.
Obviously the conditons for the second IF are not met and there is no way for TEtest_checkfit to be 1! And I don't think it has anything to do with the IFs
I am suspecting memory collision but really not sure.
Still nobady can answer what's going wrong here? |
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ye
Joined: 11 May 2005
Posts: 57
Location: london
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| Posted: Fri Oct 21, 2005 9:05 am |
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thanks humberto,
...................................
Let's forget about IF or SWITCH here and go back to the problem.
Obviously the conditons for the second IF are not met and there is no way for TEtest_checkfit to be 1! And I don't think it has anything to do with the IFs
I am suspecting memory collision but really not sure.
Still nobady can answer what's going wrong here? |
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ye
Joined: 11 May 2005
Posts: 57
Location: london
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| Posted: Fri Oct 21, 2005 9:06 am |
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thanks humberto,
...................................
Let's forget about IF or SWITCH here and go back to the problem.
Obviously the conditons for the second IF are not met and there is no way for TEtest_checkfit to be 1! And I don't think it has anything to do with the IFs
I am suspecting memory collision but really not sure.
Still nobady can answer what's going wrong here? |
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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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| Posted: Fri Oct 21, 2005 3:03 pm |
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| Quote: |
I am suspecting memory collision but really not sure
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We doesnīt know how are you are testing this code nor the tools you are using
nor the whole enviroment, but if this is your conclusion,  I give up here.
Humberto |
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