Nested loops in C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 3 using a for loop.

C

for(int i = 1; i [1] 3; 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 > or >= will not run the loop as expected.

Using < will stop before printing 3.

The loop should run while i is less than or equal to 3, so it prints 1, 2 and 3.

2fill in blank

medium

Complete the code to print a 3x3 grid of stars using nested loops.

C

for(int i = 0; i < 3; i++) {
    for(int j = 0; j [1] 3; j++) {
        printf("*");
    }
    printf("\n");
}

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

A<

B>

C>=

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= will print 4 stars instead of 3.

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

The inner loop should run while j is less than 3 to print 3 stars per line.

3fill in blank

hard

Fix the error in the nested loops to correctly print a 4x4 grid of numbers.

C

for(int row = 1; row <= 4; row++) {
    for(int col = 1; col [1] 4; col++) {
        printf("%d ", col);
    }
    printf("\n");
}

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

A>=

B<

C>

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < will stop before printing 4.

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

The inner loop should run while col is less than or equal to 4 to print numbers 1 to 4.

4fill in blank

hard

Fill both blanks to create a nested loop that prints a right triangle of stars.

C

for(int i = 1; i [1] 5; i++) {
    for(int j = 1; j [2] i; j++) {
        printf("*");
    }
    printf("\n");
}

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

A<=

B<

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < in the outer loop will print only 4 lines.

Using < in the inner loop will print one less star per line.

Both loops use <= to include the last number and print the correct number of stars per line.

5fill in blank

hard

Fill all three blanks to create a nested loop that prints a multiplication table from 1 to 3.

C

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

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

A<=

B<

Cy

Dx

Attempts:

3 left

💡 Hint

Common Mistakes

Using < will exclude the number 3.

Using x instead of y in multiplication will print squares.

The loops run from 1 to 3 inclusive, and the multiplication uses y to multiply with x.