Loops & Repetition

A loop repeats work

A loop tells the computer to repeat some instructions.

Instead of writing SHOW 1, SHOW 2, SHOW 3, and so on, we can store a counter, repeat while it is within our limit, and add one each time.

Repeat while the condition is true

The counter changes each time, eventually making the loop condition false.

CREATE count AS 1

REPEAT WHILE count LESS OR EQUAL TO 5
    SHOW count
    ADD ONE TO count
END REPEAT

The same idea in Python

Python uses while for the same repeating condition.

count = 1

while count <= 5:
    print(count)
    count += 1

The same idea in JavaScript

JavaScript uses while and ++ to add one to the counter.

let count = 1;

while (count <= 5) {
    console.log(count);
    count++;
}

The same idea in C#

C# uses the same while structure for this loop.

int count = 1;

while (count <= 5)
{
    Console.WriteLine(count);
    count++;
}

The same idea in Java

Java expresses this loop almost exactly like C# and JavaScript.

int count = 1;

while (count <= 5) {
    System.out.println(count);
    count++;
}

The same idea in C++

C++ uses the same counter and stopping condition.

int count = 1;

while (count <= 5)
{
    std::cout << count << '\n';
    count++;
}