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Asked: 2026-05-15T23:10:10+00:00

I have a quick question about the following expression: int a_variable = 0; if(0!=a_variable)

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I have a quick question about the following expression:

int a_variable = 0;
if(0!=a_variable)
   a_variable=1;

what is the difference between “(0 != a_variable)” and “(a_variable != 0)” ?
I dont have any errors for now but is this a wrong way to use it??

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1 Answer

  1. Editorial Team

    if you forget the !, the first will give an error (0 = a_variable) and the second will wreak havoc (a_variable = 0).

    Also, with user-defined operators the second form can be implemented with a member function while the first can only be a non-member (possibly friend) function. And it’s possible, although a REALLY bad idea, to define the two forms in different ways. Of course since a_variable is an int then there are no user-defined operators in effect in this example.

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