diff --git a/src/main/java/com/github/hcsp/Main.java b/src/main/java/com/github/hcsp/Main.java
index 9b33bac..7211a3d 100644
--- a/src/main/java/com/github/hcsp/Main.java
+++ b/src/main/java/com/github/hcsp/Main.java
@@ -12,12 +12,13 @@ public static void main(String[] args) {
     // 修复编译错误
     // 在a<b时返回字符串"a<b"，在a>b时返回字符串"a>b"，否则返回"a=b"
     public static String relation(int a, int b) {
+        String sign;
         if (a > b) {
-            String sign = ">";
+            sign = ">";
         } else if (a < b) {
-            String sign = "<";
+            sign = "<";
         } else {
-            String sign = "=";
+            sign = "=";
         }
 
         return "" + a + sign + b;