MQL4 Reference 
Math & Trig MathAbs
| double MathAbs( |
double value) |
Returns the absolute value (modulus) of the specified numeric value.
Parameters:
Sample:
double dx=-3.141593, dy;
// calc MathAbs
dy=MathAbs(dx);
Print("The absolute value of ",dx," is ",dy);
// Output: The absolute value of -3.141593 is 3.141593
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