✨Feat: 函数声明

main.go

@@ -5,6 +5,11 @@ import (
 	"math"
 )
 
+func add(x int, y int) int {
+	return x + y
+}
+
 func main() {
 	fmt.Println("You know Pi =", math.Pi)
+	fmt.Println("And You know 1+2 =", add(1, 2))
 }