From 3dd9723271f8b9d06593ecfd2bcbc5744b79682e Mon Sep 17 00:00:00 2001
From: JonKazama-Hellion <f.wathling@gmail.com>
Date: Thu, 16 Apr 2026 22:03:02 +0200
Subject: [PATCH] fix(calc-scientific): sqrt/square mit lastResult,
 Negate-Regex
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sqrt und x² transferieren _lastResult in _currentExpr wenn Expression leer.
handleNegate Regex akzeptiert auch dezimal-first Zahlen (.5).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 src/js/calc-scientific.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/js/calc-scientific.js b/src/js/calc-scientific.js
index ba3824b..8092306 100644
--- a/src/js/calc-scientific.js
+++ b/src/js/calc-scientific.js
@@ -69,10 +69,20 @@
   function handleSciKey(key) {
     switch (key) {
       case 'sqrt':
+        if (!Calculator._currentExpr && Calculator._lastResult) {
+          Calculator._currentExpr = 'sqrt(' + Calculator._lastResult + ')';
+          Calculator._lastResult = '';
+          Calculator._updateDisplay();
+          break;
+        }
         Calculator._currentExpr += 'sqrt(';
         Calculator._updateDisplay();
         break;
       case 'square':
+        if (!Calculator._currentExpr && Calculator._lastResult) {
+          Calculator._currentExpr = Calculator._lastResult;
+          Calculator._lastResult = '';
+        }
         Calculator._currentExpr += '^2';
         Calculator._updateDisplay();
         break;
@@ -104,7 +114,7 @@
       }
       return;
     }
-    const match = expr.match(/(-?\d+\.?\d*)$/);
+    const match = expr.match(/(-?\d*\.?\d+)$/);
     if (match) {
       const num = parseFloat(match[1]);
       const negated = String(-num);