Merge pull request mouredev#4078 from blackriper/main

Reto#28-go

Retos/Reto #28 - EXPRESIÓN MATEMÁTICA [Media]/go/blackriper.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+// funcion para comprobar si es un numero
+func IsNumber(n string) bool {
+	_, err := strconv.Atoi(n)
+	if err != nil {
+		return false
+	}
+	return true
+}
+
+// funcion para validar si tiene algun operador
+func IsOperator(n string) bool {
+	validOperators := []string{"+", "-", "*", "/", "%"}
+	for _, exp := range validOperators {
+		if n == exp {
+			return true
+		}
+	}
+	return false
+}
+
+// funcion para validar la expresion
+func ValidExpression(express string, isexpr *bool) {
+	for _, cr := range express {
+		if IsNumber(string(cr)) || IsOperator(string(cr)) || string(cr) == " " {
+			*isexpr = true
+		} else {
+			*isexpr = false
+			break
+		}
+	}
+}
+
+func main() {
+	express := "5 + 6 / 7 * 8"
+	var isexpr bool
+
+	ValidExpression(express, &isexpr)
+
+	if isexpr {
+		fmt.Printf("the expression %v is a math expression \n", express)
+	} else {
+		fmt.Printf("the expression %v is not math expression \n", express)
+	}
+}