Splitting code into multiple files - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to include the header file utils.h in main.c.

C

#include [1]

int main() {
    return 0;
}

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

A<stdio.h>

B"stdio.h"

C"utils.h"

D<utils.h>

Attempts:

3 left

💡 Hint

Common Mistakes

Using angle brackets for user header files.

Forgetting to include the header file.

In C, to include a header file from the project, angle brackets < > are used for system headers, but for user headers, double quotes " " are used. Here, since utils.h is a user header, it should be included with double quotes.

2fill in blank

medium

Complete the function declaration in utils.h to declare a function named add that takes two integers and returns an integer.

C

int [1](int a, int b);

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

Aplus

Badd

Caddition

Dsum

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name than 'add'.

Omitting the semicolon at the end.

The function name should be 'add' as specified. The declaration matches the function signature.

3fill in blank

hard

Fix the error in utils.c by completing the function definition of add.

C

int [1](int a, int b) {
    return a + b;
}

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

Aadd

Bsum

Caddition

Dplus

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name in definition than declaration.

Mismatched function signatures.

The function definition must match the declaration name 'add' to link correctly.

4fill in blank

hard

Fill both blanks to correctly compile main.c and utils.c into an executable named program.

C

gcc [1] [2] -o program

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

Amain.c

Butils.c

Cprogram.c

Dlib.c

Attempts:

3 left

💡 Hint

Common Mistakes

Compiling only one source file.

Using wrong file names.

To compile multiple source files, list them all in the gcc command. Here, main.c and utils.c are compiled together.

5fill in blank

hard

Fill all three blanks to create a header guard in utils.h to prevent multiple inclusions.

C

#ifndef [1]
#define [2]

// function declarations

#endif // [3]

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

AUTILS_H

BUTILS_H_

CUTILS_H_INCLUDED

DUTILS_H_GUARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using different macro names in the guard.

Forgetting to add header guards.

Header guards use a unique macro name. Using the same macro name in all three places prevents multiple inclusions.