Define and call functions

hello/main.go

@@ -5,5 +5,35 @@ import (
 )
 
 func main() {
-	fmt.Println("Hello from Go!")
+	fmt.Println("Define and call functions")
+	doSomthing()
+	sum := addValue(4, 5)
+	fmt.Println("The sum equal to :", sum)
+
+	multiSum, multiCount := getSumAllValues(4, 5, 6)
+	fmt.Println("Sum of multiple values", multiSum)
+	fmt.Println("Count of items", multiCount)
+
+}
+func doSomthing() {
+	fmt.Println("Doing somthing")
+}
+
+// in go i could declare the type of values just once if it's the same in function parameteres
+func addValue(value1, value2 int) int {
+	return value1 + value2
+}
+
+/*this function seems the same as the function before
+func addValue(value1 int ,value2 int) int {
+	return value1 + value2
+}*/
+
+// but you can also return multiple values from a single function for Arbitrary numbers
+func getSumAllValues(values ...int) (int, int) {
+	total := 0
+	for _, v := range values {
+		total += v
+	}
+	return total, len(values)
 }