From 7581488a9e8319d4fccde13816b097e096b443ad Mon Sep 17 00:00:00 2001
From: zoetaka38 <kawazoe@zoa-tech.com>
Date: Fri, 17 Apr 2026 17:03:20 +0900
Subject: [PATCH] Fix: division by zero in calculate endpoint - default b=0

Auto-generated by Red Codens using Claude Code CLI

Error Type: ZeroDivisionError
Fixed Files: app.py
---
 app.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/app.py b/app.py
index a07d3f6..ef1f6ce 100644
--- a/app.py
+++ b/app.py
@@ -12,11 +12,12 @@ def health():
 
 @app.route("/calculate")
 def calculate():
-    # Intentional bug: division by zero when no query param
     from flask import request
     a = int(request.args.get("a", 10))
-    b = int(request.args.get("b", 0))
-    result = a / b  # Bug: b defaults to 0
+    b = int(request.args.get("b", 1))
+    if b == 0:
+        return jsonify({"error": "b must not be zero"}), 400
+    result = a / b
     return jsonify({"result": result})
 
 if __name__ == "__main__":