Include guards - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start an include guard with the correct directive.

C

#[1] MY_HEADER_H

Drag options to blanks, or click blank then click option'

Ainclude

Bdefine

Cifndef

Dendif

Attempts:

3 left

💡 Hint

Common Mistakes

Using #define instead of #ifndef to start the guard.

Using #include instead of a preprocessor directive.

The include guard starts with #ifndef to check if the macro is not defined.

2fill in blank

medium

Complete the code to define the macro for the include guard.

C

#ifndef MY_HEADER_H
#[1] MY_HEADER_H

Drag options to blanks, or click blank then click option'

Aifndef

Bdefine

Cinclude

Dendif

Attempts:

3 left

💡 Hint

Common Mistakes

Using #ifndef again instead of #define.

Using #endif instead of #define.

After checking if the macro is not defined, we define it with #define.

3fill in blank

hard

Fix the error in the code to properly close the include guard.

C

#ifndef MY_HEADER_H
#define MY_HEADER_H
// header content
#[1]

Drag options to blanks, or click blank then click option'

Aendif

Binclude

Cifndef

Ddefine

Attempts:

3 left

💡 Hint

Common Mistakes

Using #define or #ifndef instead of #endif at the end.

Omitting the closing directive.

The include guard ends with #endif to close the conditional.

4fill in blank

hard

Fill both blanks to complete a proper include guard.

C

#[1] MY_HEADER_H
#[2] MY_HEADER_H
// header content
#endif

Drag options to blanks, or click blank then click option'

Aifndef

Bdefine

Cinclude

Dendif

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of #ifndef and #define.

Using #include or #endif in these positions.

The include guard starts with #ifndef and then #define to define the macro.

5fill in blank

hard

Fill all three blanks to write a complete include guard.

C

#[1] MY_HEADER_H
#[2] MY_HEADER_H
// content
#[3]

Drag options to blanks, or click blank then click option'

Aifndef

Bdefine

Cendif

Dinclude

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to close the guard with #endif.

Using #include instead of #define or #endif.

The include guard starts with #ifndef, then #define, and ends with #endif.