error: lvalue required as left operand of assignment (C)

Question

I see many different answers to this question and have looked at many of them yet I cannot find the answer to my problem.

The error im getting is

bitarray.c:27:19: error: lvalue required as left operand of assignment

(newArr << i) ^= 1;

Any ideas? Thanks

Did you mean `newArr = (newArr << i) ^ 1` ? If you clarify what you want, you will probably solve your own problem. — CB Bailey, Nov 14 '13 at 08:58

score 4 · Accepted Answer · edited May 23 '17 at 12:23

You are trying to assign to a result from an operation another result. Try the following right way to do it:

newArr = (newArr << i) ^ 1;

The idea is that you have to have a valid lvvalue and the temporary result of the "<<" is not a valid one. You need a variable like newArr. The following answer on SO explains many terms related to this situation:

What are rvalues, lvalues, xvalues, glvalues, and prvalues?

Hope I shed some light on the problem!

score 0 · Answer 2 · answered Nov 14 '13 at 09:10

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"<<" is a binary operator just like "+" or a "-". It needs to be assigned to a variable. For Eg. you cannot just write this a+b; Correct way is c = a+b;

answered Nov 14 '13 at 09:10

Dushyant Gupta

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You do not need to assign it. You *can* write `a+b`. – leemes Nov 14 '13 at 09:27

error: lvalue required as left operand of assignment (C)

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