math-expression-evaluator

Parses, compiles and evaluates mathematical expressions

Examples

// Import class
import com.gkozlenko.math.Expression;

// Compile the expression
Expression expression = Expression.parse("(10 - :x) * (5 + :y)");

// Set parameters
expression.setParameter(":x", 2).setParameter(":y", 3);

// Calculate
System.out.println(expression.calculate()); // Outputs 64

// Set other parameters
expression.setParameter(":x", 4.5).setParameter(":y", -1.5);

// Calculate again
System.out.println(expression.calculate()); // Outputs 19.25

Supported symbols

Symbol	Explanation	Example
+	Addition operator	1 + 2 results 3
-	Subtraction operator	10 - 3 results 7
*	Multiplication operator	5 * 2 results 10
/	Division operator	6 / 3 results 2
(	Opening parenthesis	(5 - 2) * 2 results 6
)	Closing parenthesis	(5 - 2) * 2 results 6
:	Parameter prefix	:name