Difference between revisions of "Control:While"
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'''while''' <[[LavishScript:Mathematical Formulae|formula]]> | '''while''' <[[LavishScript:Mathematical Formulae|formula]]> | ||
This form is very similar to the first form. The difference is simply that the code will always execute at least once, and the repeat condition is checked afterwards. | This form is very similar to the first form. The difference is simply that the code will always execute at least once, and the repeat condition is checked afterwards. | ||
| + | |||
| + | === Break === | ||
| + | break | ||
| + | Break is used to immediately abort from the current loop, and continue execution outside of the loop. | ||
| + | |||
| + | === Continue === | ||
| + | continue | ||
| + | Continue is used to immediately skip ''to'' the end of the loop, where the repeat condition is checked and may loop again if the condition is met. | ||
== Examples == | == Examples == | ||
| − | + | Examples 1 and 2 both produce the following output: | |
1 | 1 | ||
2 | 2 | ||
| Line 24: | Line 32: | ||
10 | 10 | ||
| − | === While === | + | === Example 1: While === |
delcare Count int 0 | delcare Count int 0 | ||
while ${Count:Inc}<=10 | while ${Count:Inc}<=10 | ||
echo ${Count} | echo ${Count} | ||
| − | === Do-While === | + | === Example 2: Do-While === |
declare Count int 1 | declare Count int 1 | ||
do | do | ||
| Line 37: | Line 45: | ||
while ${Count:Inc}<=10 | while ${Count:Inc}<=10 | ||
| + | === Example 3: Continue === | ||
| + | declare Count int 0 | ||
| + | while ${Count:Inc}<=10 | ||
| + | { | ||
| + | ; skip if Count is odd | ||
| + | if ${Count}%2==1 | ||
| + | continue | ||
| + | echo ${Count} | ||
| + | } | ||
| + | |||
| + | === Example 4: Break === | ||
| + | declare Count int 0 | ||
| + | while ${Count:Inc}<=10 | ||
| + | { | ||
| + | ; Break early if session number ${Count} exists | ||
| + | if ${Session[${Count}](exists)} | ||
| + | break | ||
| + | echo ${Count} | ||
| + | } | ||
| + | echo Done. Session[${Count}] is ${Session[${Count}]} | ||
== See Also == | == See Also == | ||
Revision as of 02:19, 13 September 2005
Contents
Forms
While
while <formula> <command or code block>
This form will conditionally execute the following command or code block. The command or code block must begin on the following line. The command or code block will be executed if the result of the calculation is not equal to zero (0), which means it will be skipped if the result of the calculation is equal to zero (0). After executing the command or code block, execution will return to the while, where the entire process repeats (formula is evaluated, code is either executed or skipped, ad infinitum).
Do-While
do <command or code block> while <formula>
This form is very similar to the first form. The difference is simply that the code will always execute at least once, and the repeat condition is checked afterwards.
Break
break
Break is used to immediately abort from the current loop, and continue execution outside of the loop.
Continue
continue
Continue is used to immediately skip to the end of the loop, where the repeat condition is checked and may loop again if the condition is met.
Examples
Examples 1 and 2 both produce the following output:
1 2 3 4 5 6 7 8 9 10
Example 1: While
delcare Count int 0
while ${Count:Inc}<=10
echo ${Count}
Example 2: Do-While
declare Count int 1
do
{
echo ${Count}
}
while ${Count:Inc}<=10
Example 3: Continue
declare Count int 0
while ${Count:Inc}<=10
{
; skip if Count is odd
if ${Count}%2==1
continue
echo ${Count}
}
Example 4: Break
declare Count int 0
while ${Count:Inc}<=10
{
; Break early if session number ${Count} exists
if ${Session[${Count}](exists)}
break
echo ${Count}
}
echo Done. Session[${Count}] is ${Session[${Count}]}
