From 6ac882699aedacd004643b7466443924d866878f Mon Sep 17 00:00:00 2001
From: Tanner Collin <git@tannercollin.com>
Date: Sat, 14 Mar 2026 13:43:07 -0600
Subject: [PATCH] fix: Correct floating point precision for trig functions

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
---
 calculator/calculator.app.js | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/calculator/calculator.app.js b/calculator/calculator.app.js
index 4a0f464..c97bca5 100644
--- a/calculator/calculator.app.js
+++ b/calculator/calculator.app.js
@@ -206,6 +206,11 @@ function subtract(x, y) {
   return sum(x, -y);
 }
 
+function fixFloat(n) {
+  if (Math.abs(n) < 1e-10) return 0;
+  return n;
+}
+
 function doMath(x, y, operator) {
   switch (operator) {
     case '/':
@@ -366,14 +371,14 @@ function buttonPress(val) {
         if (angleMode === 'deg') {
           angle = angle * Math.PI / 180;
         }
-        results = Math.sin(angle);
+        results = fixFloat(Math.sin(angle));
         displayOutput(results);
       } else if (currNumber != null) {
         let angle = currNumber;
         if (angleMode === 'deg') {
           angle = angle * Math.PI / 180;
         }
-        currNumber = Math.sin(angle);
+        currNumber = fixFloat(Math.sin(angle));
         displayOutput(currNumber);
       }
       hasPressedNumber = false;
@@ -384,14 +389,14 @@ function buttonPress(val) {
         if (angleMode === 'deg') {
           angle = angle * Math.PI / 180;
         }
-        results = Math.cos(angle);
+        results = fixFloat(Math.cos(angle));
         displayOutput(results);
       } else if (currNumber != null) {
         let angle = currNumber;
         if (angleMode === 'deg') {
           angle = angle * Math.PI / 180;
         }
-        currNumber = Math.cos(angle);
+        currNumber = fixFloat(Math.cos(angle));
         displayOutput(currNumber);
       }
       hasPressedNumber = false;
@@ -402,14 +407,14 @@ function buttonPress(val) {
         if (angleMode === 'deg') {
           angle = angle * Math.PI / 180;
         }
-        results = Math.tan(angle);
+        results = fixFloat(Math.tan(angle));
         displayOutput(results);
       } else if (currNumber != null) {
         let angle = currNumber;
         if (angleMode === 'deg') {
           angle = angle * Math.PI / 180;
         }
-        currNumber = Math.tan(angle);
+        currNumber = fixFloat(Math.tan(angle));
         displayOutput(currNumber);
       }
       hasPressedNumber = false;