Why C is widely used - Test Your Understanding

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'

Aprint

Bprintf

Cecho

Dcout

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'print' or 'echo' which are not C functions.

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 'count' in C.

C

[1] count = 10;

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

Aint

Bfloat

Cstring

Dchar

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'float' for integers or 'string' which is not a C type.

In C, int is used to declare integer variables.

3fill in blank

hard

Fix the error in the code to correctly include the standard input/output header.

C

#include [1]

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

A<stdio>

B"stdio"

C"stdio.h"

D<stdio.h>

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes instead of angle brackets or missing '.h' extension.

The correct way to include the standard input/output header in C is #include <stdio.h>.

4fill in blank

hard

Fill both blanks to declare a pointer to an integer and assign it the address of variable 'num'.

C

int num = 5;
[1] *ptr;
ptr = [2];

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

Aint

B&num

Cnum

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning the value instead of the address to the pointer.

To declare a pointer to an integer, use int *ptr;. To assign it the address of 'num', use ptr = #.

5fill in blank

hard

Fill all three blanks to define a function named 'add' that takes two integers and returns their sum.

C

[1] add([2] a, [3] b) {
    return a + b;
}

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

Aint

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'void' as return type or parameter types.

The function 'add' returns an integer and takes two integer parameters.