### Operators for Expressions

The following basic operators are available inside PC-DMIS:

+ Addition: <Expression> + <Expression>
Adds the two expressions together. In the case of strings, strings are concatenated.

- Subtraction: <Expression> - <Expression>
Subtracts the first expression from the second expression.

* Multiplication: <Expression> * <Expression>
Multiplies the two expressions.

/ Division: <Expression> / <Expression>
Divides first expression by the second expression.

^ Exponentiation: <Expression> ^ <Expression>
Raises the first expression to the power of the second expression.

% Modulo: <Expression> % <Expression>
Returns the remainder of one expression divided by the other.

- Additive Inverse -<Expression>
Returns the additive inverse of the expression.

! Logical Not: !<Expression>
Returns the logical not of the expression.

== Equal To: <Expression> == <Expression>
Evaluates to 1 if expressions are equal. Otherwise, it evaluates to 0. ( Two equal signs are used to distinguish from the assignment operator = in the assignment statement).

<> Not Equal To: <Expression> <> <Expression>
Evaluates to 1 if expression are not equal. Otherwise, it evaluates to 0.

> Greater Than: <Expression> > <Expression>
Evaluates to 1 if first expression is greater than second expression. Otherwise, it evaluates to 0.

>= Greater Than or Equal To: <Expression> >= <Expression>
Evaluates to 1 if the first expression is greater than or equal to the second expression. Otherwise, it evaluates to 0.

< Less Than: <Expression> < <Expression>
Evaluates to 1 if first expression is less than the second expression. Otherwise, it evaluates to 0.

<= Less Than or Equal To: <Expression> <= <Expression>
Evaluates to 1 if the first expression is less than or equal to the second expression. Otherwise, it evaluates to 0.

AND Logical And: <Expression> AND <Expression>
Evaluates to 1 if both expressions does not evaluate to 0. Otherwise, it evaluates to 0.

OR Logical Or: <Expression> OR <Expression> Evaluates to 1 if either expressions does not evaluate to 0. Otherwise, it evaluates to 0.

() Parenthesis: ( <Expression> )
Gives evaluation to precedence to expression inside of parenthesis.