While

While allows you to repeat a loop of instructions as long as a condition is true.

Syntax

While EXPRESSIONINSTRUCTION_LISTWend

• INSTRUCTION_LIST is a list of instructions in a script.
• EXPRESSION is a numeric expression that is considered as true if it is not equal to 0.

Examples

# Example 1 : let's perform a computation with successive approximationsVARIA=INIT_VALUEWhile abs(func COMPUTE(VARIA)-TARGET)>EXPECTED_PRECISIONVARIA=func ITERATE(VARIA)Wend# Example 2 : let's wait until the database is updated or until a limit hour is reachedTIMEOUT="22:00:00"While time$<TIMEOUTSleep 1Break func DATABASE_UPDATED=1Wend

Description

While allows to perform loops as long as the following occurs:

• A condition is true, that is the numeric expression returns a not null value.
• A Break instruction has not been executed to interrupt the loop.

If the condition is false at the beginning, no iteration is done, and the execution resumes after the Wend.

Associated errors

See also

For, To, Next, Step, Break, Repeat, Until, Wend, If, Then, Else, Elsif, Endif.