Do-while loop execution model in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a do-while loop that prints "Hello" once.

C Sharp (C#)

do {
    Console.WriteLine("Hello");
} while ([1]);

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

Afalse

Btrue

C0

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'true' causes an infinite loop.

Using '0' or 'null' is invalid for a boolean condition.

The do-while loop runs the block once before checking the condition. Using false stops the loop after one iteration.

2fill in blank

medium

Complete the code to repeat the loop while the variable count is less than 3.

C Sharp (C#)

int count = 0;
do {
    Console.WriteLine(count);
    count++;
} while ([1]);

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

Acount > 3

Bcount >= 3

Ccount == 3

Dcount < 3

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'count > 3' causes the loop to never run.

Using 'count == 3' runs only when count equals 3, which is after the loop.

The loop continues while count is less than 3, printing 0, 1, and 2.

3fill in blank

hard

Fix the error in the do-while loop condition to compile correctly.

C Sharp (C#)

int i = 0;
do {
    Console.WriteLine(i);
    i++;
} while ([1]);

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

Ai < 5

Bi = 5

Ci++ < 5

Di => 5

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' assigns instead of compares.

Using '=>' is invalid syntax here.

The condition must be a boolean expression. i < 5 correctly checks if i is less than 5.

4fill in blank

hard

Fill both blanks to create a do-while loop that prints numbers 1 to 3.

C Sharp (C#)

int num = 1;
do {
    Console.WriteLine(num);
    num[1]1;
} while (num [2] 4);

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

A++

B--

C<

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '--' decreases the number, causing an infinite loop.

Using '>' in the condition stops the loop immediately.

Increment num with ++ and loop while num < 4 to print 1, 2, 3.

5fill in blank

hard

Fill all three blanks to create a do-while loop that prints even numbers from 2 to 6.

C Sharp (C#)

int val = [1];
do {
    Console.WriteLine(val);
    val [2] 2;
} while (val [3] 8);

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

A2

B+=

C<

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' decreases the value, causing an infinite loop.

Using '>' in the condition stops the loop too early.

Start val at 2, add 2 each time with +=, and loop while val < 8 to print 2, 4, 6.