mathparser

mathparser is a simple Go package that provides a mathematical expression parser. It can parse and evaluate mathematical expressions with basic operators and functions.

Installation

To use this package in your Go project, you can install it using the following go get command:

go get github.com/AmrMady/mathparser/parser

Example 1

package main

import (
"fmt"
"github.com/AmrMady/mathparser/parser"
)

func main() {
	// Simple mathematical expression to be evaluated
	expression := "(2 + 3) * 4 ^ 2 / (5 - 1)"

	// Parse and evaluate the expression using ParseSimple
	result, err := parser.ParseSimple(expression)
	if err != nil {
		fmt.Println("Error:", err)
		return
	}

	// Print the result: 20.000000
	fmt.Printf("Result of '%s': %f\n", expression, result)


	// Simple mathematical expression to be evaluated
	expression2 := fmt.Sprintf("(%d + %f) * 4 ^ 2 / (%f - %f)", 2, 3.5, 5.7, 1.0)
	
	// Parse and evaluate the expression
	result2, err := parser.ParseSimple(expression2)
	if err != nil {
		fmt.Println("Error:", err)
		return
	}

	// Print the result: 18.723404255
	fmt.Printf("Result of '%s': %.9f\n", expression2, result2)
}

Example 2

package main

import (
	"fmt"
	"github.com/AmrMady/mathparser/parser"
)

func main() {
	// Mathematical expression with variables to be evaluated
	expression := "x * y + (z - w) / a"

	// Define variables and their values
	variables := map[string]float64{
		"x": 5.5,
		"y": 4,
		"z": 20,
		"w": 15,
		"a": 2.5,
	}

	// Parse and evaluate the expression with variables
	result, err := parser.ParseWithVariables(expression, variables)
	if err != nil {
		fmt.Println("Error:", err)
		return
	}

	// Print the result: 110
	fmt.Printf("Result of '%s': %f\n", expression, result)
}