diff --git a/main.go b/main.go
index 3eb89bc..9881d9e 100644
--- a/main.go
+++ b/main.go
@@ -7,10 +7,18 @@ func main() {
 	//普通for循环
 	for i := 0; i < len(a); i++ {
 		fmt.Printf("输入第%d位学生的成绩：", i+1)
-		fmt.Scanln(&a[i])
+		_, err := fmt.Scanln(&a[i])
+		if err != nil {
+			return
+		}
 	}
 	//for range循环
 	for a, b := range a {
 		fmt.Printf("第%d个学生成绩为%d\n", a, b)
 	}
+	Grades := 1
+	for _, b := range a {
+		Grades = Grades + b
+	}
+	fmt.Printf("平均成绩为%d", Grades/len(a))
 }