If you write your equivalency tests in C "backwards", your are much less likely to accidentally use = where you meant ==. For instance:
if (VALUE == variable)
{
/* ... */
}
rathern than:
if (variable == VALUE)
{
/* ... */
}
because the 1st method will generate an error on the compile if VALUE is not a modifiable lvalue (a variable into which you can assign a value). Using the 2nd method, you could accidentally write if (variable = VALUE) and the mistake may go unnoticed, for a while anyway.
BTW, this trick isn't really my own, but I use it.
