### /**/ Preprocessor Macro Operator

The /**/ operator differs from the ## operator only in the way that the preprocessor treats white space between the operator and its arguments.

For example, the macro definition:

>     #define XY(x, y) x /**/y

does not give the same result as:

>     #define XY(x, y) x ##y

because the preprocessor preserves white space with the /**/ operator. With the ## operator, arguments are concatenated without white space.

The following examples demonstrate the use of the /**/ operator:

Sample Preprocessor Macro Definitions
`#define ws1(x, y) x /**/y``` `#define ws2(x, y) x/**/ y``` `#define nws1(x, y) x ##y``` `#define nws2(x, y) x##y`
Invocation | Result of Macro Expansion
--- | ---
`ws1(Turtle, neck)` | `Turtle neck`
`ws2(Turtle, neck)` | `Turtle neck`
`nws1(Turtle, neck)` | `Turtleneck`
`nws2(Turtle, neck)` | `Turtleneck`

For /**/ to function the same way as ## in ANSI/ISO C, there can be no spaces between the operator and the arguments.

Preprocessor Directives
Preprocessor Macros

Preprocessor Macro Operators
#define Preprocessor Directive