From c363e2814e42ed5cd66e2442a6a56d14520f17de Mon Sep 17 00:00:00 2001
From: mecca <mecca@Zipcoders-MacBook-10.local>
Date: Sun, 12 Jul 2026 14:56:08 -0400
Subject: [PATCH] Added add and subtract methods

---
 Bash                                          |  0
 src/main/TestScientificCalculator             | 44 +++++++++++++++++++
 .../ScientificCalculator.java                 | 35 +++++++++++++++
 3 files changed, 79 insertions(+)
 create mode 100644 Bash
 create mode 100644 src/main/TestScientificCalculator
 create mode 100644 src/main/java/com/zipcodewilmington/scientificcalculator/ScientificCalculator.java

diff --git a/Bash b/Bash
new file mode 100644
index 00000000..e69de29b
diff --git a/src/main/TestScientificCalculator b/src/main/TestScientificCalculator
new file mode 100644
index 00000000..a3e4f699
--- /dev/null
+++ b/src/main/TestScientificCalculator
@@ -0,0 +1,44 @@
+package com.zipcodewilmington.scientificcalculator;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class TestScientificCalculator {
+
+    @Test
+    void newCalculatorShouldStartAtZero() {
+        ScientificCalculator calculator = new ScientificCalculator();
+
+        assertEquals(0, calculator.getDisplay());
+    }
+
+    @Test
+    void setDisplayShouldChangeDisplay() {
+        ScientificCalculator calculator = new ScientificCalculator();
+
+        calculator.setDisplay(25);
+
+        assertEquals(25, calculator.getDisplay());
+    }
+
+    @Test
+    void clearShouldResetDisplayToZero() {
+        ScientificCalculator calculator = new ScientificCalculator();
+
+        calculator.setDisplay(25);
+        calculator.clear();
+
+        assertEquals(0, calculator.getDisplay());
+    }
+
+    @Test
+    void addShouldUpdateDisplay() {
+        ScientificCalculator calculator = new ScientificCalculator();
+
+        calculator.setDisplay(5);
+        calculator.add(3);
+
+        assertEquals(8, calculator.getDisplay());
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/zipcodewilmington/scientificcalculator/ScientificCalculator.java b/src/main/java/com/zipcodewilmington/scientificcalculator/ScientificCalculator.java
new file mode 100644
index 00000000..b0b76a87
--- /dev/null
+++ b/src/main/java/com/zipcodewilmington/scientificcalculator/ScientificCalculator.java
@@ -0,0 +1,35 @@
+package com.zipcodewilmington.scientificcalculator;
+
+public class ScientificCalculator {
+    
+    private double display;
+    private double memory;
+    private boolean error;
+    private String displayMode;
+    private String unitsMode;
+
+   public ScientificCalculator() { 
+   display = 0;
+   memory = 0;
+   error = false;
+   displayMode = "decimal";
+   unitsMode = "degrees";
+   }
+
+   public double getDisplay() {
+    return display;
+   }
+   public void setDisplay(double value) {
+    display = value;   }
+   public void clear() {
+    display = 0;
+    error = false;
+   }
+   public void add(double value) {
+    display = display + value;
+   }
+    public void subtract(double value) {
+    display = display - value;
+}
+
+}