Making calculator using stash and cherry-picking in git

tasks/task-03/HarshitRSethi/calculator.cpp

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+#include <iostream>
+using namespace std;
+
+/*
+  Function: calculateFinalAmount
+  Purpose : Calculates final payable amount after tax and discount.
+*/
+
+double calculateFinalAmount(double amount, int customerType)
+{
+    // Part A
+    if (amount <= 0)
+    {
+        cout << "Invalid amount" << endl;
+        return -1;
+    }
+    else
+    {
+        double tax = (amount / 100) * 18;
+        double total = tax + amount;
+
+        // Part B
+        //  Discount based on customer type
+
+        if (customerType == 1)
+        {                         // Regular Customer
+            total = total * 0.95; // 5% discount
+        }
+        else if (customerType == 2)
+        {                         // Premium Customer
+            total = total * 0.85; // 15% discount
+        }
+        return total;
+    }
+}
+
+int main()
+{
+    double amount;
+    int type;
+
+    cout << "Enter bill amount: ";
+    cin >> amount;
+
+    cout << "Enter customer type (1-Regular, 2-Premium): ";
+    cin >> type;
+
+    double payable = calculateFinalAmount(amount, type);
+    if (payable == -1)
+        return 1;
+
+    cout << "Final Payable Amount: " << payable << endl;
+
+    return 0;
+}