While

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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.

Usage

While E Begin
  I1;
  I2;
  I3;
End;

Where:

E - a true/false expression.
I - conditional instructions.

Notes

  • 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:
while (value1 < 10) begin
 
	Print("Value1 is: ", value1);
 
end;	
value1 = value1 + 1; 	// This should be placed in the while-loop, not outside of it

Example

Add the high prices of the last 10 bars to the HighPriceSum variable:

BarBackNo = 0;
 
While BarBackNo < 10 Begin
 
  HighPriceSum = HighPriceSum + High[BarBackNo];
  BarBackNo = BarBackNo + 1;
 
End;