diff --git a/src/small_computer/Main.java b/src/small_computer/Main.java
index ab48a1c..adcf423 100644
--- a/src/small_computer/Main.java
+++ b/src/small_computer/Main.java
@@ -6,6 +6,7 @@ public class Main {
 		Subtraction ss=new Subtraction();
 		Division dd=new Division();
 		MUL mm=new MUL();
+		Addition aa=new Addition();
 		System.out.println("1-加法计算      2-减法运算");
 		System.out.println("3-乘法运算      4-除法计算");
 		System.out.println("请输入选择：");
@@ -14,7 +15,11 @@ public class Main {
 		System.out.println("请输入两个运算数：");
 		int a=sc.nextInt();
 		int b=sc.nextInt();
-		if(n==2) {
+		if(n==1) {
+			int c=(int) aa.add(a, b);
+			System.out.println(c);
+		}
+		else if(n==2) {
 			int c=(int) ss.sub(a, b);
 			System.out.println(c);
 		}