fgh

go/01-basics/calculator.go

@@ -58,3 +58,80 @@ func main() {
 		}
 	}
 }
+
+
+
+package main
+ 
+import (
+	"fmt"
+)
+ 
+const (
+	opAdd      = "add"
+	opSubtract = "subtract"
+	opMultiply = "multiply"
+	opDivide   = "divide"
+	opExit     = "exit"
+)
+ 
+var result float64
+ 
+func add(a, b float64) {
+	result = a + b
+}
+func multiply(a, b float64) {
+	result = a * b
+}
+func subtract(a, b float64) {
+	result = a - b
+}
+func divide(a, b float64) {
+	result = a / b
+}
+ 
+func main() {
+	var x float64
+	var y float64
+
+	//TODO: implement according to README.md 
+
+	//the following code just demonstrates how to use fmt.Scan
+
+		for {
+		fmt.Print("What would you like to do? (add|subtract|divide|multiply|exit)")
+		var str string
+		fmt.Scan(&str)
+		if str == opExit {
+			break
+		} else {
+ 
+			fmt.Print("Please enter a float: ")
+			fmt.Scan(&x)
+ 
+			fmt.Print("Please enter a float: ")
+			fmt.Scan(&y)
+ 
+			switch str {
+			case opAdd:
+				add(x, y)
+				fmt.Println(result)
+			case opMultiply:
+				multiply(x, y)
+				fmt.Println(result)
+			case opDivide:
+				if y == 0 {
+					fmt.Println("Division by 0 is not possible")
+					continue
+				}
+				divide(x, y)
+				fmt.Println(result)
+			case opSubtract:
+				subtract(x, y)
+				fmt.Println(result)
+			default:
+				fmt.Println("Unknown operation")
+			}
+		}
+	}
+}