Hi Everybody
the compiler throws an error when it runs this function in my code, I couldn't figure out what is wrong with my code, please assist me, thanks :). - void SMAC::IncreaseCW() {
-
init rI=2;
-
DATA_CW=DATA_CW*rI;
-
double cw = (Random::random() % DATA_CW) * slotTime_sec_;
-
mhCS_.sched(CLKTICK2SEC(difs_) + cw);
-
- mac/smac.cc: In member function `void SMAC::IncreaseCW()':
-
mac/smac.cc:463: error: non-lvalue in assignment
-
10 10527 Banfa 9,065
Recognized Expert Moderator Expert
init rI=2;
Did you mean int?
JosAH 11,448
Recognized Expert MVP @Banfa
DATA_CW suggests to be a macro name ... who knows?
kind regards,
Jos
sorry folks, i meant
int rI = 2;
im still facing the same error, any help? thx :)
Your error says line 463. Which of those lines is 463?
You have an assignment involving something called DATA_CW, but you didn't post the code which defines DATA_CW.
More info == more help.
JosAH 11,448
Recognized Expert MVP @muby
Did you read the error message and did you check the line your compiler complained about? Learn how to read error messages; it'll be a lot faster than posting here everytime you see one.
kind regards,
Jos
Thanks for your reply, the line where im getting error is shown below,
I defined DATA_CW in header file as
#define DATA_CW 63
- # void SMAC::IncreaseCW() {
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# int rI=2;
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# DATA_CW=DATA_CW*rI; # error is in this line (line 463)
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# double cw = (Random::random() % DATA_CW) * slotTime_sec_;
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# mhCS_.sched(CLKTICK2SEC(difs_) + cw);
-
}
After preprocessing it's expanded to
63 = 63*2;
Left part is a number here, you can't assign to numbers. What are you trying to do?
IncreaseCW should increases the value of DATA_CW by doubling the old value of DATA_CW, and assigne the new value back to DATA_CW. this new value will be used in other functions.
I changed it as shown below, but im still getting the same error. - void SMAC::IncreaseCW() {
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int DATA_CW_new;
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DATA_CW_new = (DATA_CW*rateincrease);
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DATA_CW = DATA_CW_new;
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double cw = (Random::random() % DATA_CW) * slotTime_sec_;
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mhCS_.sched(CLKTICK2SEC(difs_) + cw);
-
}
Read newb16's post again.
DATA_CW is a macro, not a variable. It is replaced by the compiler with '63' wherever it occurs in your code. You cannot assign to it. Use a variable.
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