What is C - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print "Hello, World!" in C.

C

#include <stdio.h>

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

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

Aecho

Bprint

Cprintf

Dcout

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'print' instead of 'printf'.

Using 'cout' which is from C++.

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

2fill in blank

medium

Complete the code to declare an integer variable named 'age' in C.

C

[1] age = 25;

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Avar

Bnum

Cinteger

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'var' which is not valid in C.

Using 'integer' which is not a C keyword.

In C, int is used to declare integer variables.

3fill in blank

hard

Fix the error in the code to correctly declare a character variable named 'letter'.

C

char [1] = 'A';

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Aletter

B1letter

Cchar

Dlet

Attempts:

3 left

💡 Hint

Common Mistakes

Starting variable name with a digit.

Using reserved keywords as variable names.

Variable names cannot start with a number. 'letter' is a valid name.

4fill in blank

hard

Fill both blanks to create a for loop that counts from 0 to 4 in C.

C

for (int i = [1]; i [2] 5; i++) {
    printf("%d\n", i);
}

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

A0

B<

C<=

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' causes the loop to run one extra time.

Starting the loop at 1 instead of 0.

The loop starts at 0 and continues while i is less than 5.

5fill in blank

hard

Fill all three blanks to declare and initialize an array of 3 integers in C.

C

int [1][[2]] = [3];

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

Anumbers

B3

C{1, 2, 3}

Darray

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid variable names.

Not using curly braces to initialize the array.

This declares an integer array named 'numbers' with 3 elements initialized to 1, 2, and 3.