Software Engineering and Computer Games

22.17. Real numbers

Simulations work better with real numbers, and there is a Real type and some macros we use in our programs, so we’re going to have a file called RealNumber.h which we include in our files using real numbers. (If we didn’t want to do all those includes, we could have put the #include “realnumber.h” somewhere inside of the StdAfx.h file, for instance right before the line that says //{{AFX_INSERT_LOCATION}}.)

In our code we use Real as another word for double or for float. To give ourselves the freedom to switch between double and float, depending on whether we have a greater need for accuracy or for speed, we have a line saying typedef double Real or typedef float Real inside RealNumber.h.

 #ifndef REALNUMBER_H #define REALNUMBER_H ...