Operators Operators The following sections discuss the valid operators. Assignment Operator The equal sign (=) is used to assign a value to a numeric or string variable. The variable being assigned a value must appear by itself on the left side of the equal sign. The right side of the equal sign can contain any variable or value of the same data type as the left side, or any expression that resolves to the same data type as the left side. Any variables used on the right side of an assignment operator must have been previously initialized. Location variables require the use of the SET instruction for a valid assignment statement. The instruction:
loc_var1 = loc_var2 is unacceptable for location and precision-point variables. Mathematical Operators eV+ uses the standard mathematical operators shown in the following table. Mathematical Operators Relational Operators Relational operators are used in expressions that yield a Boolean value. The resolution of an expression containing a relational operator is always -1 (true) or 0 (false) and tells you if the specific relation stated in the expression is true or false. The most common use of relational expressions is with the control structures. eV+ uses the standard relational operators shown in the following table.
eV+Language User's Guide, v2.x, 18318-000 Rev A Page 51 Symbol Function + addition - subtraction or unary minus * multiplication / division MOD modular (remainder) division