From 9ecca33be534d3319d875a03b0e8a6da2f0b80ec Mon Sep 17 00:00:00 2001
From: Sahil karmakar <157059634+sahil43karmakar@users.noreply.github.com>
Date: Thu, 30 Oct 2025 02:26:17 +0530
Subject: [PATCH] Smart functionality in Smartcalc.cpp

Implement a  calculator with addition, subtraction, multiplication, and division functionalities, including error handling for division by zero and invalid operators.
---
 C++_calculator/Smartcalc.cpp | 54 ++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 C++_calculator/Smartcalc.cpp

diff --git a/C++_calculator/Smartcalc.cpp b/C++_calculator/Smartcalc.cpp
new file mode 100644
index 00000000..2e9102f7
--- /dev/null
+++ b/C++_calculator/Smartcalc.cpp
@@ -0,0 +1,54 @@
+#include <iostream>
+#include <stdexcept>
+using namespace std;
+
+// One-word logic summary: Encapsulation
+class Calculator {
+public:
+    double add(double a, double b) { return a + b; }           // Addition
+    double subtract(double a, double b) { return a - b; }      // Subtraction
+    double multiply(double a, double b) { return a * b; }      // Multiplication
+    double divide(double a, double b) {                        // Division with zero check
+        if (b == 0) throw runtime_error("Division by zero");
+        return a / b;
+    }
+};
+
+int main() {
+    Calculator calc;           // Object creation
+    double num1, num2, result; // Input and result variables
+    char op, choice;           // Operator and loop control
+
+    cout << "=== SmartCalcCPP ===" << endl;
+
+    do {
+        // INPUT BLOCK
+        cout << "\nEnter first number: ";
+        cin >> num1;
+        cout << "Enter operator (+ - * /): ";
+        cin >> op;
+        cout << "Enter second number: ";
+        cin >> num2;
+
+        // OPERATION BLOCK
+        try {
+            switch (op) {
+                case '+': result = calc.add(num1, num2); break;       // ADD
+                case '-': result = calc.subtract(num1, num2); break;  // SUBTRACT
+                case '*': result = calc.multiply(num1, num2); break;  // MULTIPLY
+                case '/': result = calc.divide(num1, num2); break;    // DIVIDE
+                default: throw invalid_argument("Invalid operator");
+            }
+            cout << "Result: " << result << endl;
+        } catch (exception& e) {
+            cout << "Error: " << e.what() << endl;
+        }
+
+        // LOOP CONTROL
+        cout << "\nDo another calculation? (y/n): ";
+        cin >> choice;
+    } while (choice == 'y' || choice == 'Y');
+
+    cout << "\nThank you for using SmartCalcCPP!" << endl;
+    return 0;
+}