Why operators are needed in C - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add two numbers and store the result.

C

int a = 5, b = 3;
int sum = a [1] b;

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

A-

B/

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction - instead of addition.

The plus operator + adds two numbers together.

2fill in blank

medium

Complete the code to check if a number is greater than 10.

C

int num = 15;
if (num [1] 10) {
    // do something
}

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

A>

B<=

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than < instead of greater than.

The greater than operator > checks if the left value is bigger than the right.

3fill in blank

hard

Fix the error in the code to multiply two numbers.

C

int x = 4, y = 6;
int product = x [1] y;

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

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition + instead of multiplication.

The multiplication operator * multiplies two numbers.

4fill in blank

hard

Fill both blanks to create a condition that checks if a number is between 5 and 10 (inclusive).

C

int val = 7;
if (val [1] 5 && val [2] 10) {
    // inside range
}

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

A>=

B<

C<=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using > or < which exclude boundaries.

Use >= to check if value is at least 5, and <= to check if it is at most 10.

5fill in blank

hard

Fill all three blanks to calculate the average of three numbers.

C

int a = 4, b = 8, c = 12;
float avg = ([1] + [2] + [3]) / 3.0;

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

Aa

Bb

Cc

Davg

Attempts:

3 left

💡 Hint

Common Mistakes

Using the variable avg inside its own calculation.

The average is the sum of a, b, and c divided by 3.