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[[Begin]] should not be followed by a semicolon (;), code lines within an instruction group should end with a semicolon (;), and [[End]] should be followed by a semicolon (;). ==== Usage ====
[[:'''E''' - a true/false expression.:'''I]] ''' - conditional instructions .
<syntaxhighlight>BarBackNo=0;
While BarBackNo<10 Begin
HighPriceSum=HighPriceSum+High[BarBackNo];
BarBackNo=BarBackNo+1;
Used in combination with [[Begin]] and [[End]] to form a conditional loop statement that will execute a set of instructions repeatedly as long as a logical expression is true. If the logical expression is not true, the instructions will not be executed.
[[Begin]] and [[End]] statements are used to group instructions for conditional execution; a [[Begin]] must always be followed by an [[End.]].
<syntaxhighlight>While E Begin
I1; I2; I3;
End;</syntaxhighlight>
Where: [[E]] - a true/false expression
==Notes == Example * [[Begin]] should not be followed by a semicolon (;), code lines within an instruction group should end with a semicolon (;), and [[End]] should be followed by a semicolon (;). * Important: if the loop doesn't contain code that will cause the logical expression to evaluate to false, you'll be stuck in an ''infinite loop'', which will cause MultiCharts to freeze. For example, the code below '''is not correct''':<syntaxhighlight>while (value1 < 10) begin Print("Value1 is: ", value1); end; value1 = value1 + 1; // This should be placed in the while-loop, not outside of it</syntaxhighlight> ==Example ==Add the high prices of the last 10 bars to the [[''HighPriceSum]] '' variable: <syntaxhighlight>BarBackNo = 0; While BarBackNo < 10 Begin HighPriceSum = HighPriceSum + High[BarBackNo]; BarBackNo = BarBackNo + 1;
End;</syntaxhighlight>
[[Category:Comparisons and Loops]]