Lære Challenge: 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.

Remember like in the previous section, we 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


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#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.

Opgave

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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.

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

Løsning

solution.cpp

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Sektion 3. Kapitel 3

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Suggested prompts:

Can you give me an example of a nested for loop?

What kind of practice exercises can I try with nested loops?

Can you explain the difference between nested for and nested while loops?

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