Revision as of 23:39, 28 January 2013

For As

Description

Loop based on an expression.

for ( <expression1> ; <expression2> ; <expression3> )
{
    statements
    ...
}

Parameters

expression1

An expression to execute before starting the loop.

expression2

An expression to evaulate and check if its TRUE.

If it is not TRUE the loop will end (Or not even begin).

expression3

An expression to execute after each cycle of the loop.

Usually $i++ or $i += something

Remarks

For statements may be nested.

The expression2 can contain the boolean operators of &&, ||, ! as well as the logical operators <, <=, >, >=, ==, !=, <>, eq, eqi, neq and neqi as needed grouped with parentheses as needed.

Example

Count up to from 1 to 10

for ( $i = 1; $i <= 10; $i++ )
{
	println( "Value is $i" );
}

Count down to from 10 to 1

for ( $i = 10; $i > 0; $i-- )
{
	println( "Value is $i" );
}

Count up to from 2 to 20 counting in 2s

for ( $i = 2; $i <= 20; $i += 2 )
{
	println( "Value is $i" );
}

Print all array elements Method 1

$arr = array( "One", "Two", "Three", "Four", "Five" );
for ( $i = 0; $i < UBound($arr); $i++ )
{
	$item = $arr[$i];
	println( "Value is " . $item );
}

Print all array elements Method 2

$arr = array( "One", "Two", "Three", "Four", "Five" );
for ( $i = 0; $i < UBound($arr); $i++ )
{
	println( "Value is $arr[$i]" );
}

A perl style number to number for

for( 0 .. 10 )
{
	println("Value $_");
}

Another perl style but this time using variables

$a = 1;
$b = 30;
 
for( $a..$b )
{
	println("Value $_");
}