For loop in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 0 to 4 using a for loop.

C++

#include <iostream>

int main() {
    for (int i = 0; i [1] 5; i++) {
        std::cout << i << std::endl;
    }
    return 0;
}

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

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>=' instead of '<' causes the loop not to run.

Using '<=' prints one extra number.

The loop should run while i is less than 5 to print numbers 0 to 4.

2fill in blank

medium

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

C++

#include <iostream>

int main() {
    int sum = 0;
    for (int i = 1; i [1] 5; i++) {
        sum += i;
    }
    std::cout << sum << std::endl;
    return 0;
}

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

A<

B>=

C<=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' excludes 5 from the sum.

Using '>=' causes the loop not to run.

The loop should include 5, so use '<=' to sum numbers 1 through 5.

3fill in blank

hard

Fix the error in the for loop condition to count down from 5 to 1.

C++

#include <iostream>

int main() {
    for (int i = 5; i [1] 1; i--) {
        std::cout << i << std::endl;
    }
    return 0;
}

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

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' or '<=' causes the loop not to run.

Using '>' excludes 1 from the output.

To count down from 5 to 1, the loop should run while i is greater than or equal to 1.

4fill in blank

hard

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

C++

#include <iostream>

int main() {
    for (int i = [1]; i [2] 10; i += 2) {
        std::cout << i << std::endl;
    }
    return 0;
}

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

A2

B1

C<=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 1 prints odd numbers.

Using '<' excludes 10 from the output.

Start at 2 and continue while i is less than or equal to 10 to print even numbers.

5fill in blank

hard

Fill all three blanks to create a for loop that prints squares of numbers from 1 to 4.

C++

#include <iostream>

int main() {
    for (int [1] = 1; [2] [3] 5; i++) {
        std::cout << i * i << std::endl;
    }
    return 0;
}

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

Ai

C<=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names causes errors.

Using '<=' prints one extra square.

Use 'i' as the variable, and loop while i is less than 5 to print squares from 1 to 4.