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bookChallenge: How to Work with Nested For Loops in C++

A nested for loops are almost the same as a nested while loops. They allow you to create a set of iterations within another set of iterations, but in more convenient way. It is particularly useful when dealing with two-dimensional or multi-dimensional data structures with elements your want to iterate through.

You had a task that involved creating a rectangle in a console using three loops. As you already could guess there is a more straightforward and flexible way to accomplish this.

main.cpp

main.cpp

copy

              
12345678910111213

            
#include <iostream>

int main()
{
    for (int i = 0; i < 5; i++)
    {
        for (int j = 0; j < 5; j++)
        {
            std::cout << '#';
        }
        std::cout << std::endl;
    }
}

Understanding nested loops may be challenging initially, but once you grasp the concept, it becomes easy. So, let's try to practice.

Task

Swipe to start coding

You need to generate a multiplication table of a given size. The table should display all products for numbers from 1 up to the given size.

All the code should be implemented inside the multiplicationTable function.

  1. Use a for loop to iterate over rows, with the iterator i starting from 1 up to size.
  2. Inside the row loop, use another for loop to iterate over columns, with the iterator j also running from 1 up to size.
  3. For each pair (i, j), calculate the product i * j.
  4. After finishing each row, print an empty line to separate rows visually.

Solution

solution.cpp

solution.cpp

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Thanks for your feedback!

SectionΒ 3. ChapterΒ 3
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bookChallenge: How to Work with Nested For Loops in C++

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A nested for loops are almost the same as a nested while loops. They allow you to create a set of iterations within another set of iterations, but in more convenient way. It is particularly useful when dealing with two-dimensional or multi-dimensional data structures with elements your want to iterate through.

You had a task that involved creating a rectangle in a console using three loops. As you already could guess there is a more straightforward and flexible way to accomplish this.

main.cpp

main.cpp

copy

              
12345678910111213

            
#include <iostream>

int main()
{
    for (int i = 0; i < 5; i++)
    {
        for (int j = 0; j < 5; j++)
        {
            std::cout << '#';
        }
        std::cout << std::endl;
    }
}

Understanding nested loops may be challenging initially, but once you grasp the concept, it becomes easy. So, let's try to practice.

Task

Swipe to start coding

You need to generate a multiplication table of a given size. The table should display all products for numbers from 1 up to the given size.

All the code should be implemented inside the multiplicationTable function.

  1. Use a for loop to iterate over rows, with the iterator i starting from 1 up to size.
  2. Inside the row loop, use another for loop to iterate over columns, with the iterator j also running from 1 up to size.
  3. For each pair (i, j), calculate the product i * j.
  4. After finishing each row, print an empty line to separate rows visually.

Solution

solution.cpp

solution.cpp

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Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 3
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