Predefined macros - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the current line number using a predefined macro.

C

#include <stdio.h>

int main() {
    printf("Line number: %d\n", [1]);
    return 0;
}

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

A__DATE__

B__FILE__

C__TIME__

D__LINE__

Attempts:

3 left

💡 Hint

Common Mistakes

Using __FILE__ instead of __LINE__ which prints the file name.

Using __DATE__ or __TIME__ which print date or time, not line number.

The __LINE__ macro expands to the current line number in the source file.

2fill in blank

medium

Complete the code to print the current file name using a predefined macro.

C

#include <stdio.h>

int main() {
    printf("File name: %s\n", [1]);
    return 0;
}

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

A__FILE__

B__LINE__

C__DATE__

D__TIME__

Attempts:

3 left

💡 Hint

Common Mistakes

Using __LINE__ which gives a number, not a string.

Using __DATE__ or __TIME__ which give date or time, not file name.

The __FILE__ macro expands to the current source file name as a string.

3fill in blank

hard

Fix the error in the code to print the compilation date using a predefined macro.

C

#include <stdio.h>

int main() {
    printf("Compiled on: %s\n", [1]);
    return 0;
}

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

A__DATE__

B__LINE__

C__FILE__

D__TIME__

Attempts:

3 left

💡 Hint

Common Mistakes

Using __TIME__ which gives time, not date.

Using __FILE__ or __LINE__ which give file name or line number.

The __DATE__ macro expands to the compilation date as a string.

4fill in blank

hard

Fill both blanks to print the compilation date and time using predefined macros.

C

#include <stdio.h>

int main() {
    printf("Compiled on: %s at %s\n", [1], [2]);
    return 0;
}

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

A__DATE__

B__TIME__

C__FILE__

D__LINE__

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of date and time macros.

Using __FILE__ or __LINE__ instead of date/time macros.

__DATE__ gives the compilation date and __TIME__ gives the compilation time.

5fill in blank

hard

Fill all three blanks to print the file name, line number, and compilation time using predefined macros.

C

#include <stdio.h>

int main() {
    printf("File: %s, Line: %d, Time: %s\n", [1], [2], [3]);
    return 0;
}

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

A__FILE__

B__LINE__

C__TIME__

D__DATE__

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of macros.

Using __DATE__ instead of __TIME__ for the time.

__FILE__ gives the file name, __LINE__ the line number, and __TIME__ the compilation time.