Format specifiers - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print an integer variable using printf.

C

#include <stdio.h>

int main() {
    int num = 10;
    printf("[1]\n", num);
    return 0;
}

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

A%d

B%c

C%f

D%s

Attempts:

3 left

💡 Hint

Common Mistakes

Using %f for integers causes incorrect output.

Using %c prints a single character, not an integer.

The %d format specifier is used to print integers in C.

2fill in blank

medium

Complete the code to print a floating-point number with printf.

C

#include <stdio.h>

int main() {
    float pi = 3.14f;
    printf("[1]\n", pi);
    return 0;
}

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

A%d

B%s

C%c

D%f

Attempts:

3 left

💡 Hint

Common Mistakes

Using %d prints only the integer part, not the decimal.

Using %c or %s is incorrect for numbers.

The %f format specifier is used to print floating-point numbers in C.

3fill in blank

hard

Fix the error in the code to correctly print a character.

C

#include <stdio.h>

int main() {
    char letter = 'A';
    printf("[1]\n", letter);
    return 0;
}

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

A%d

B%f

C%c

D%s

Attempts:

3 left

💡 Hint

Common Mistakes

Using %d prints the ASCII code, not the character.

Using %s expects a string, not a single char.

The %c format specifier is used to print a single character in C.

4fill in blank

hard

Fill both blanks to print a string and an integer correctly.

C

#include <stdio.h>

int main() {
    char name[] = "Bob";
    int age = 25;
    printf("Name: [1], Age: [2]\n", name, age);
    return 0;
}

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

A%s

B%d

C%f

D%c

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the format specifiers causes wrong output.

Using %f for integers or strings causes errors.

%s prints strings and %d prints integers in C.

5fill in blank

hard

Fill all three blanks to print a float with two decimals, a character, and a string.

C

#include <stdio.h>

int main() {
    float price = 9.99f;
    char grade = 'A';
    char product[] = "Book";
    printf("Price: [1], Grade: [2], Product: [3]\n", price, grade, product);
    return 0;
}

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

A%.2f

B%c

C%s

D%d

Attempts:

3 left

💡 Hint

Common Mistakes

Using %f without precision prints many decimals.

Mixing up %c and %s causes wrong output.

%.2f prints a float with 2 decimal places, %c prints a character, and %s prints a string.