adding my new file in github about higher order functions

Author: withgaurav

higherorderfunctions.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"fmt"
+)
+
+func calcArea(r float64) float64 {
+	return 3.14 * r * r
+}
+func calcDiameter(r float64) float64 {
+	return 2 * r
+}
+func calcPerimeter(r float64) float64 {
+	return 2 * 3.14 * r
+}
+func main() {
+	var query int
+	var radius float64
+	fmt.Print("enter the radius of the circle: ")
+	fmt.Scanf("%f", &radius)
+	fmt.Printf("ENter \n 1 - area \n 2- perimeter \n 3 - diamter: ")
+	fmt.Scanf("%d", &query)
+
+	if query == 1 {
+		fmt.Println("Result: ", calcArea(radius))
+	} else if query == 2 {
+		fmt.Println("Result: ", calcPerimeter(radius))
+	} else if query == 3 {
+		fmt.Println("Result: ", calcDiameter(radius))
+	} else {
+		fmt.Println("Invalid Query")
+	}
+
+}
+func printResult(radius float64, calcFunction func(r float64) float64) {
+	result := calcFunction(radius)
+	fmt.Println("result: ", result)
+	fmt.Println("Thankyou!")
+}