Loops

Loops.

I don't think it'll be possible for a programming language to survive without a loop feature. In simple-lang, all loop types are practiced: do..while, for loops and while loop.

For loops.

This is the basic type of loop and most commonly used one. It is used widely in Arrays and other scenarios where the need arise. Let's see how the syntax look like:

for # A condition passed,
    # Do something. 
end # Close loop.

<!-- The loop below displays  from 8 to 12.-->

for n = 8 to 12 
	display "number "+n+" "
end

The for loop statement looks quite different right ?. Well, the to word there is just a faster representation of this : n < 12; n++ as we''ll have in other languages.

The for loop also has a feature that allows it to jump / loop over a certain number e.g

for a = 2 to 10 step 2
	display crlf + a
end

The above example, loops even number from 2 to 10. This is possible using the step word in the loop argument. A little complex code will be required in other languages.

The While loop.

Th e while loop, performs an action when a requirement is fulfilled. Let's view the syntax:

n = 1

while n < 10  
	display " "+n + " "
	n++
end

The above example, loops n while it's value is less than 10. The while loop can also have it's actions embedded in curly braces ({}). This is only when a complex argument is passed or will have multiple return statements. Take for example:

while ( n <= 100 ) {
	display " " +n + " "
	n = n + 10
}

Note that For and while loops should have their sub statements enclosed in curly brackets only when the supplied argument is enclosed in parenthesis ().

The do..while loop.

This loops executes an action when there's a fulfillment of requirement. Like the name, do a particular action while the supplied requirement is satisfied. Example of this:

n = 1

do {
	display " "+n + " "
	n++
} while  n < 10 

The above example, loops througn n while n is less than 10. The do..while loops is very useful in complex algorithm building.