Why loops are needed in C Sharp (C#) - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 5 using a loop.

C Sharp (C#)

for (int i = 1; i [1] 5; i++)
{
    Console.WriteLine(i);
}

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

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using > or >= will not run the loop correctly.

Using < will exclude 5 from printing.

The loop should run while i is less than or equal to 5 to print numbers 1 to 5.

2fill in blank

medium

Complete the code to sum numbers from 1 to 10 using a loop.

C Sharp (C#)

int sum = 0;
for (int num = 1; num [1] 10; num++)
{
    sum += num;
}
Console.WriteLine(sum);

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

A<

B>=

C>

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < will exclude 10 from the sum.

Using > or >= will cause the loop not to run as expected.

The loop should include 10, so use <= to sum numbers 1 through 10.

3fill in blank

hard

Fix the error in the loop condition to print all elements of the array.

C Sharp (C#)

string[] fruits = {"apple", "banana", "cherry"};
for (int i = 0; i [1] fruits.Length; i++)
{
    Console.WriteLine(fruits[i]);
}

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

A<=

B>

C<

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= causes an index out of range error.

Using > or >= will not enter the loop correctly.

Array indexes go from 0 to Length - 1, so the loop should run while i < fruits.Length.

4fill in blank

hard

Fill both blanks to create a loop that prints even numbers from 2 to 10.

C Sharp (C#)

for (int num = [1]; num [2] 10; num += 2)
{
    Console.WriteLine(num);
}

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

A2

B<

C<=

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 1 will print odd numbers.

Using < will exclude 10 from printing.

The loop starts at 2 and runs while num <= 10 to include 10.

5fill in blank

hard

Fill all three blanks to create a loop that prints numbers from 5 down to 1.

C Sharp (C#)

for (int i = [1]; i [2] 1; i [3])
{
    Console.WriteLine(i);
}

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

A5

B>=

C--

D++

Attempts:

3 left

💡 Hint

Common Mistakes

Using ++ will increase i and cause an infinite loop.

Using < instead of >= will skip printing 1.

The loop starts at 5, runs while i >= 1, and decreases i by 1 each time.