C Preprocessor

Macros have a local scope.

A:

True

B:

False

C:

D:

Answer: B

False, The scope of macros is globals and functions. Also the scope of macros is only from the point of definition to the end of the file.

📖

A macro must always be defined in capital letters.

A:

True

B:

False

C:

D:

Answer: B

FALSE, The macro is case insensitive.

📖

Macro calls and function calls work exactly similarly.

A:

True

B:

False

C:

D:

Answer: B

False, A macro just replaces each occurrence with the code assigned to it. e.g. SQUARE(3) with ((3)*(3)) in the program.

A function is compiled once and can be called from anywhere that has visibility to the funciton.

📖

A preprocessor directive is a message from programmer to the preprocessor.

A:

True

B:

False

C:

D:

Answer: A

True, the programmer tells the compiler to include the preprocessor when compiling.

📖

There exists a way to prevent the same file from getting #included twice in the same program.

A:

True

B:

False

C:

D:

Answer: A

True, We can prevent the same file from getting included again by using a preprocessor directive called #ifndef (short for "if not defined") to determine whether we've already defined a preprocessor symbol called XSTRING_H. If we have already defined this symbol, the compiler will ignore the rest of the file until it sees a #endif (which in this case is at the end of the file).

#ifndef XSTRING_H

#define XSTRING_H defines the same preprocessor symbol,

Finally, the last line of the file, #endif

📖

Questions for: C Preprocessor