Dummy

[Lost.at.C]

What would a definition for a dummy be in C and were should it be used Thanks!

[anduril462]

#define DUMMY

I'm not totally sure what you're asking, but I think you're referring to a dummy variable. A dummy variable is just a variable that you don't need, but that you use to make the calculation more clear. You would declare it like any other variable. In the following example, time is a dummy variable

// calculate position: x = x0 + v0 * t + 1/2 * a * t^2
// no dummy variable
x = x0 + v0 * (end_time - start_time) + 0.5 * a * (end_time - start_time) * (end_time - start_time);

// calculate position: x = x0 + v0 * t + 1/2 * a * t^2
// with dummy variable, much cleaner
int    time = end_time - start_time;
x = x0 + v0 * time + 0.5 * a * time * time;

[iMalc]

A dummy variable would be used in the case a function takes for example, an out reference parameter, where the caller has no interest in that particular bit of information.

Windows message handlers and the bHandled parameter, are a place it commonly comes up.

[nonoob]

What would a definition for a dummy be in C and were should it be used Thanks!

I think it already contains the punch line!
(Not meant against the OP Lost.at.C, but in general. There are lots.)