update

Author: jincheng9

workspace/lesson5/readme.md

@@ -45,8 +45,14 @@
 
 * Go没有三目运算符`?:`
 
+## 运算符优先级
 
+参考：https://go.dev/ref/spec#Operator_precedence
 
 ## References
 
 * https://github.com/jincheng9/golang-cheat-sheet-cn#%E6%93%8D%E4%BD%9C%E7%AC%A6
+
+* https://go.dev/ref/spec#Operator_precedence
+
+  

workspace/test/file/main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	if file_info, err := os.Stat("main.go"); os.IsNotExist(err) {
+		fmt.Println(file_info, err)
+	} else {
+		fmt.Println(err)
+	}
+}

workspace/test/operator/main.go

@@ -0,0 +1,10 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	result := false && true || true
+	fmt.Println(result)
+}