first commit

Calc.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/Knetic/govaluate"
+)
+
+var exp string = ""
+var ver string = ""
+var vsn bool = false
+
+func init() {
+	flag.BoolVar(&vsn, "v", false, "Show Program Version")
+	flag.StringVar(&exp, "e", "", "Evaluable Expression")
+	flag.Parse()
+}
+
+func main() {
+	if vsn {
+		_ShowVersion()
+		os.Exit(0)
+	}
+
+	if exp == "" {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	expression, err := govaluate.NewEvaluableExpression(exp)
+	if err != nil {
+		fmt.Printf("[ERR]  %v\r\n", err)
+		os.Exit(1)
+	}
+	result, err := expression.Evaluate(nil)
+	if err != nil {
+		fmt.Printf("[ERR]  %v\r\n", err)
+		os.Exit(1)
+	}
+	fmt.Printf("Result=%v\r\n", result)
+}
+
+func _ShowVersion() {
+	fmt.Printf("%s\r\nAuthor: %s\r\nVersion: %s\r\n", os.Args[0], "TE / Vayne Tan", ver)
+}

go.mod

@@ -0,0 +1,5 @@
+module Calc
+
+go 1.20
+
+require github.com/Knetic/govaluate v3.0.0+incompatible

go.sum

@@ -0,0 +1,2 @@
+github.com/Knetic/govaluate v3.0.0+incompatible h1:7o6+MAPhYTCF0+fdvoz1xDedhRb4f6s9Tn1Tt7/WTEg=
+github.com/Knetic/govaluate v3.0.0+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=