Using printf for output in C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the text "Hello, World!".

C

#include <stdio.h>

int main() {
    [1]("Hello, World!\n");
    return 0;
}

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

Aprintf

Bprint

Ccout

Decho

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'print' which is not a C function.

Using 'cout' which is from C++.

Using 'echo' which is from shell scripting.

The printf function is used in C to print formatted output to the screen.

2fill in blank

medium

Complete the code to print the integer variable 'num' 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%f

B%d

C%s

D%c

Attempts:

3 left

💡 Hint

Common Mistakes

Using %s which is for strings.

Using %f which is for floating-point numbers.

Using %c which is for characters.

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

3fill in blank

hard

Fix the error in the printf statement to correctly print a float variable 'pi'.

C

#include <stdio.h>

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

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

A%c

B%s

C%d

D%f

Attempts:

3 left

💡 Hint

Common Mistakes

Using %d which is for integers.

Using %s which is for strings.

Using %c which is for characters.

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

4fill in blank

hard

Fill both blanks to print a character and an integer using printf.

C

#include <stdio.h>

int main() {
    char letter = 'A';
    int number = 5;
    printf("Character: [1], Number: [2]\n", letter, number);
    return 0;
}

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

A%c

B%d

C%f

D%s

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping %c and %d.

Using %f or %s incorrectly.

%c prints a character and %d prints an integer in C.

5fill in blank

hard

Fill all three blanks to print a string, an integer, and a float using printf.

C

#include <stdio.h>

int main() {
    char name[] = "Bob";
    int age = 25;
    float height = 5.9;
    printf("Name: [1], Age: [2], Height: [3]\n", name, age, height);
    return 0;
}

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

A%d

B%s

C%f

D%c

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up format specifiers.

Using %c for strings or floats.

%s prints strings, %d prints integers, and %f prints floats in C.