Inline functions: in exectution of normal functions compiler overhead occurs by jumping to and fro from stack to avoid this inline functions are used it executes the given functions directly without moving it to stack
Macros:macros are the functions with only few lines .
#define SquareOf(x) x*x
It defines a kind of function which, used in an actual piece of code, looks exactly like any other function call:
double yout,xin=3;
yout = SquareOf(xin);
As we shall see in a moment, the problem is that SquareOf only pretends to be a function call, while it is really something completely different.
The formal syntax of a macro is:
#define name(dummy1[,dummy2][,...]) tokenstring
The symbols dummy1, dummy2, ... are called dummy arguments (as usual, square brackets indicate optional items). There are a few additional rules such as that the macro can extend over several lines, provided one uses a backslash to indicate line continuation:
