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Expressions in Scripts or Templates can contain any of the standard C operators:
- + (addition)
- - (subtraction)
- * (multiplication)
- / (division)
- ~ (binary invert)
- ^ (binary xor)
- & (binary and)
- | (binary or)
- % (modulus)
- ++ (increment)
- -- (decrement)
- ?: (ternary)
- << (shift left)
- >> (shift right)
Note that the >> operator can give different results depending if the operand is signed or unsigned. When unsigned the left-most bit will always be zero (logical shift) and when signed the left-most bit is copied from the operand (arithmetic shift). Brackets '(' or ')' can be used to group expressions. For example:
(45 + 123) * (456 ^ 16)
is a valid expression. The following comparison operators can be used:
- < (less than)
- > (greater than)
- <= (less than or equal)
- >= (greater than or equal)
- == (equal)
- != (not equal)
- ! (not)
For example,
(45 > 32)
would return the value 1. Any of the assignment operators +=, -=, *=, /=, &=, ^=, %=, |=, <<=, or >>= can also be used. A number of addition Special Keywords including sizeof can be used in expressions.
Boolean Operators
The following boolean operators can be used in expressions:
- && (AND)
- || (OR)
- ! (NOT - takes one operator only)
For example, to perform an operation if A and B are true or if C is not true, use:
if( (A && B) || !C ) ...
Brackets can be used to indicate which order the operations should be performed.
Numbers
Numbers may be entered in a number of different formats (see Introduction to Number Systems):
- Decimal - 456
- Hexadecimal - 0xff, 25h, 0EFh
- Octal - 013 (with a zero before any numbers)
- Binary - 0b011
The 'u' character can be used after a number to indicate an unsigned value (e.g. '12u'), or 'L' can be used to indicate an 8-byte int64 value (e.g. '-1L'). Floating-point numbers may contain 'e' for an exponent (e.g. 1e10). A floating-point number is automatically assumed to be an 8-byte double unless an 'f' character is located after the name (e.g. 2.0f), in which case the number is assumed to be a 4-byte float.
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