Error msg: "invalid lvalue in assignment"

[mike00800]

Hi everyone, this is my first time using the forum.

I get the error msg "invalid lvalue in assignment". The line it refers to is as follows:

for(counter1=counter-5;counter1<=counter+5;counter1++){if(CONTACTS[counter1][0]=j && CONTACTS[counter1][1]=j_voisine){
counter2=counter2+1;                                                                                                       }
                                                      }

'counter' and 'counter1' have been declared outside main() and the code above is called within main(). I have used 'counter' as follows:

if(CONTACTS[counter-1][0]!=0 && (CONTACTS[counter-1][0]!=1052 || CONTACTS[counter-1][0]!=1053))

and there was no problems.

Has anybody encountered anything like this before?

Thanks,

Mike00800

[matsp]

I don't see what is wrong in your code, but "invalid lvalue in assignment" usually means that "the compiler can't figure out what it's assigning to", and usually it's caused by trying to do "stupid" things like:

   int i, j;
   ... 
   i + 1 = j;

What is "CONTACTS"?

--
Mats

[ElemenT.usha]

if(CONTACTS[counter1][0] = j && CONTACTS[counter1][1] = j_voisine

i suppose it suld be == not =
by using = u r assignig j to CoNTACTS[........er1][0] .......

wat r u doin in this???? plssss tell wat r j and j_visine......
if u wanna equate replace = with ==

[mike00800]

Hi Mats,

Thanks for your help. "CONTACTS" is an int array that contains the list of pairs of grains that are in contact with each other i.e. 'j' and 'j_voisine'.

1 5
1 8
2 27
etc.

I'm at a complete loss as I've perfromed similar operations before without any trouble

Mike00800

[mike00800]

Hi ElemenT.usha,

If I replace '=' with '==' as you suggested, do I need to replace '!=' with '!==' ???
Stupid question, I know

mike00800

[matsp]

No, you use one equal to assign something. Two equals to compare something. I didn't notice that the if-statement was suspicious, I think this is the right thing. !== is not a valid token in C.

--
Mats