# Parameters Manager Expressions [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [User Guide](Help%20System/GSTARCAD/2021/User%20Guide/(User%20Guide).md) → [Additional Pages](Help%20System/GSTARCAD/2021/User%20Guide/Additional%20Pages/(Additional%20Pages).md) ## Parameters Manager Expressions **Used Operators in Expressions** The following operators within expressions are supported by dimensional constraint parameters and user variables: | Operator | Description | | --- | --- | | \+ | Addition | | － | Subtraction or unary negation | | % | Floating point modulo | | \* | Multiplication | | / | Division | | ^ | Exponentiation | | ( ) | Parenthesis, expression delimiter | | . | Decimal separator | **Functions Supported in Expressions** The following functions are available for use in expressions: | Syntax | Function | | --- | --- | | cos(expression) | Cosine | | sin(expression) | Sine | | tan(expression) | Tangent | | acos(expression) | Arc cosine | | asin(expression) | Arc sine | | atan(expression) | Arc tangent | | cosh(expression) | Hyperbolic cosine | | sinh(expression) | Hyperbolic sine | | tanh(expression) | Hyperbolic tangent | | acosh(expression) | Arc hyperbolic cosine | | asinh(expression) | Arc hyperbolic sine | | atanh(expression) | Arc hyperbolic tangent | | sqrt(expression) | Square root | | sign(expression) | Signum function (-1,0,1) | | round(expression) | Round to nearest integer | | trunc(expression) | Truncate decimal | | floor(expression) | Round down | | ceil(expression) | Round up | | abs(expression) | Absolute value | | max(expression1;expression2) | Largest element in array | | min(expression1;expression2) | Smallest element in array | | d2r(expression) | Degrees to radians | | r2d(expression) | Radians to degrees | | ln(expression) | Logarithm, base *e* | | log(expression) | Logarithm, base 10 | | exp(expression) | Exponent, base e | | exp10(expression) | Exponent, base 10 | | pow(expression1;expression2) | Power function | | Random | Random decimal, 0-1 | --- Gstarsoft Co.,Ltd ## Other versions with matching text [GstarCAD 2017](../../../2017/User%20Guide/Additional%20Pages/Parameters%20Manager%20Expressions.md) · [GstarCAD 2018](Help%20System/GSTARCAD/2018/User%20Guide/Additional%20Pages/Parameters%20Manager%20Expressions.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/User%20Guide/Additional%20Pages/Parameters%20Manager%20Expressions.md) · [GstarCAD 2020](Help%20System/GSTARCAD/2020/User%20Guide/Additional%20Pages/Parameters%20Manager%20Expressions.md)