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Operators

OVM supports the usual operators found in most 3GL languages. The OVM operators in precendence order are (highest first, left to right equal).

(,) Open bracket and close bracket
[,] Array open bracket and close bracket
{,} Variable substitution open bracket and close bracket
-, ~ , NOT Integer unary minus, Bitwise not, Boolean not
*, /, %, MOD Multiply, Divide, Modulus (%,'MOD')
+, - Add, Subract
<, >, <=, >=, =, <> Less than, Greater than, Less than or equal, Greater than or equal, Equal to, Not equal to
& Bitwise and
^ Bitwise exclusive or
| Bitwise or
AND Boolean and
XOR Boolean exclusive or
OR Boolean or

The operator precedence determines the order in which OVM evaluates subexpressions.

The addition operator + can also be used to concatenate strings together.

Unlike DOS Ozterm, OVM observes the correct precendence of operators. This can lead to subtle errors if a DOS Ozterm script is used unmodified in the OVM environment. Eg. In DOS Ozterm 1 + 2 * 3 = 9, In OVM 1 + 2 * 3 = 7. When in doubt use the () operators to ensure the expression is evaluated in the required order. Eg. (1 + 2) * 3 = 9.

The symbol for the equality operator = also doubles as the symbol for the assignment operator =. This is unlike C, and Pascal which have different symbols to distinguish between the assignment operator, and the equality operator.

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