新

script.js

@@ -0,0 +1,57 @@
+let currentInput = '';
+let previousInput = '';
+let operation = null;
+
+function appendNumber(number) {
+    currentInput += number.toString();
+    document.getElementById('display').value = currentInput;
+}
+
+function appendDecimal(dot) {
+    if (!currentInput.includes(dot)) {
+        currentInput += dot;
+        document.getElementById('display').value = currentInput;
+    }
+}
+
+function chooseOperation(op) {
+    if (currentInput !== '') {
+        previousInput = currentInput;
+        operation = op;
+        currentInput = '';
+    }
+}
+
+function calculateResult(equals) {
+    let result;
+    const prev = parseFloat(previousInput);
+    const curr = parseFloat(currentInput);
+    if (isNaN(prev) || isNaN(curr)) return;
+    switch (operation) {
+        case '+':
+            result = prev + curr;
+            break;
+        case '-':
+            result = prev - curr;
+            break;
+        case '*':
+            result = prev * curr;
+            break;
+        case '/':
+            result = prev / curr;
+            break;
+        default:
+            return;
+    }
+    currentInput = result.toString();
+    document.getElementById('display').value = currentInput;
+    previousInput = '';
+    operation = null;
+}
+
+function clearDisplay() {
+    currentInput = '';
+    previousInput = '';
+    operation = null;
+    document.getElementById('display').value = '';
+}s