Updated README

Author: Pramod-Devireddy

README.md

@@ -1,3 +1,87 @@
 <p align="center">
-    <h1 align="center"> Go Mathematical Expression Toolkit </h1>
+    <h1 align="center"> Go Mathematical Expression Toolkit</h1>
 </p>
+
+The Go Expression Toolkit (Go-ExprTk) is a wrapper library based on C++ Mathematical Expression Toolkit Library ([ExprTk](http://www.partow.net/programming/exprtk/)). It is a simple to use, easy to integrate and extremely efficient run-time mathematical expression parser and evaluation engine. Go-ExprTk supports numerous forms of functional, logical and vector processing semantics and is very easily extendible.
+
+## Installation
+
+```bash
+go get github.com/Pramod-Devireddy/go-exprtk
+```
+
+## Examples
+
+```Go
+package main
+
+import (
+	"fmt"
+
+	"github.com/Pramod-Devireddy/go-exprtk"
+)
+
+func main() {
+	exprtkObj := exprtk.NewExprtk()
+
+	exprtkObj.SetExpression("(x + 2)*(y-2)")
+
+	exprtkObj.AddDoubleVariable("x")
+	exprtkObj.AddDoubleVariable("y")
+
+	err := exprtkObj.CompileExpression()
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+
+	exprtkObj.SetDoubleVariableValue("x", 18)
+	exprtkObj.SetDoubleVariableValue("y", 32)
+
+	fmt.Println(exprtkObj.GetEvaluatedValue())
+}
+```
+
+Check out more [Examples](https://github.com/Pramod-Devireddy/go-exprtk/tree/main/examples) 
+
+
+## ⚡ Features
+
+The Go-ExprTk library has the following capabilities:
+
+* Mathematical operators (+, -, *, /, %, ^)
+
+* Functions (min, max, avg, sum, abs, ceil, floor, round, roundn, exp, log, log10, logn, pow, root, sqrt, clamp, inrange, swap)
+
+* Trigonometry (sin, cos, tan, acos, asin, atan, atan2, cosh, cot, csc, sec, sinh, tanh, d2r, r2d, d2g, g2d, hyp)
+
+* Equalities & Inequalities (=, ==, <>, !=, <, <=, >, >=)
+
+* Assignment (:=, +=, -=, *=, /=, %=)
+
+* Logical operators (and, nand, nor, not, or, xor, xnor, mand, mor)
+
+* Control structures (if-then-else, ternary conditional, switch case, return-statement)
+
+* Loop structures (while loop, for loop, repeat until loop, break, continue)
+
+* Optimization of expressions (constant folding, strength reduction, operator coupling, special functions and dead code elimination)
+
+* String operations (equalities, inequalities, logical operators, concatenation and sub-ranges)
+
+* Expression local variables, vectors and strings
+
+* User defined variables, vectors, strings, constants and function support
+
+* Multivariate function composition
+
+* Multiple sequence point and sub expression support
+
+* Numeric integration and differentiation
+
+* Vector Processing: BLAS-L1 (axpy, axpby, axpb), all/any-true/false, count, rotate-left/right, shift-left/right, sort, nth_element, iota, sum, kahan-sum, dot-product, copy
+
+
+## ❤️ Credits
+
+This module could not be possible without the [ExprTk](http://www.partow.net/programming/exprtk/) library by [Arash Partow](https://github.com/ArashPartow) and the idea of creating the wrapper module by [Narayana Rao G S](https://twitter.com/narayanraogs)

examples/example-01.go

@@ -18,7 +18,11 @@ func main() {
 	exprtkObj.AddDoubleVariable("y")
 
 	// Compile the expression after expression and variables declaration
-	exprtkObj.CompileExpression()
+	err := exprtkObj.CompileExpression()
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
 
 	// Set values for the variables
 	exprtkObj.SetDoubleVariableValue("x", 18)