While loop operator - MQL4

MQL4 while Loop Operator

Overview

The while operator executes a specified operator repeatedly as long as a checked expression remains true. The syntax is while(expression) operator;.

Behavior

The expression is evaluated before each execution of the operator.

If the expression evaluates to true, the operator is executed.

This process continues until the expression evaluates to false.

If the expression is false from the beginning, the operator will not be executed at all.

Constraints and Recommendations

For loops expected to handle a large number of iterations, it is advisable to check for forced program termination using the IsStopped() function within the loop condition to prevent infinite loops or unresponsive scripts.

Syntax

while(expression)
  operator;

Example

while(k < n && !IsStopped()) {
  y = y * x;
  k++;
}