C Preprocessor Test 3

The correct option is (d).

Explanation:

There is no such operator called $. The second and third operator are used for stringize and token pasting operators respectively.

Therefore the operator '\' is used for continue the definition of macro in the next line.

The correct option is (c).

Explanation:

There is no such macro defined with the name __C++__, but the __cplusplus__ is predefined macro as per ANSI C specification.

Therefore the __C++__ is invalid predefined macro as per ANSI C.

The correct option is (b).

Explanation:

The conditional macro statement #if must have an #endif statement. In the program there is no #endif statement used.

Therefore the program returns an Error: unexpected end of file because there is no matching #endif.

The correct option is (d).

Explanation:

The macro statement #undef undefined the previously declared macro symbol.

The macro statement #if #ifdef #elif are called conditional macros.

Hence all the given statements are correct macro preprocessor directives in C language.

The correct option is (a).

Explanation:

In a program the macro MEAN is defined with an expansion.

During preprocessing, the occurrence of MEAN is replaced with their expansion, then send to compiler and program is executed as below:

Therefore the output of the above program is "Mean of 5 numbers=3".