Why loop control is required - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

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

C

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

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

A>=

B<

C>

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' will stop the loop before printing 5.

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

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

2fill in blank

medium

Complete the code to skip printing the number 3 in the loop.

C

for(int i = 1; i <= 5; i++) {
    if(i [1] 3) {
        continue;
    }
    printf("%d\n", i);
}

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

A==

B<

C>

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' will skip all numbers except 3.

Using '>' or '<' will skip wrong numbers.

The continue statement skips the current iteration when i equals 3, so 3 is not printed.

3fill in blank

hard

Fix the error in the loop to avoid an infinite loop.

C

int i = 1;
while(i [1] 5) {
    printf("%d\n", i);
    // Missing increment
    i++;
}

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

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Not incrementing the loop variable causes infinite loops.

Using wrong comparison operators can cause the loop to never run or run infinitely.

The loop condition should be i < 5 and the loop must include an increment to avoid infinite looping. Here, the condition i < 5 is correct but the increment is missing, so the loop never ends.

4fill in blank

hard

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

C

for(int i = [1]; i [2] 10; i += 2) {
    printf("%d\n", i);
}

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

A2

B1

C<=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 1 will print odd numbers.

Using '<' will stop before printing 10.

The loop starts at 2 and runs while i <= 10, incrementing by 2 each time to print even numbers.

5fill in blank

hard

Fill all three blanks to create a loop that prints numbers from 10 down to 1.

C

for(int i = [1]; i [2] 1; i[3]) {
    printf("%d\n", i);
}

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

A10

B>=

C--

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' will cause the loop to never run.

Using '++' will cause an infinite loop counting up.

The loop starts at 10, runs while i >= 1, and decrements i by 1 each time to print numbers from 10 down to 1.