Merge pull request #41 from harshsankhla18/main

feat: added Expense Tracker

Author: prajwal3114

README.md

@@ -38,7 +38,7 @@
 
 - **Semester Grade Calculator**: Calculate grades, GPA, and provide detailed semester summaries based on marks and credits.
 
-
+- **Expense Tracker**: Tracks your expenses where one can add, delete and view transactions .
 ---
 
 ## 🧱 Tech Stack

Src/Expense_Tracker/expenses.txt

@@ -0,0 +1 @@
+Food,1205.690000,PyC Dinner

Src/Expense_Tracker/main.cpp

@@ -0,0 +1,198 @@
+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <iomanip>
+#include <string>
+
+using namespace std;
+
+class Transaction {
+private:
+    string category;
+    double amount;
+    string note;
+
+public:
+    Transaction(string c, double a, string n) {
+        category = c;
+        amount = a;
+        note = n;
+    }
+
+    string getCategory() const { return category; }
+    double getAmount() const { return amount; }
+    string getNote() const { return note; }
+
+    void display() const {
+        cout << left << setw(15) << category
+             << setw(10) << fixed << setprecision(2) << amount
+             << setw(25) << note << endl;
+    }
+
+    string toFileString() const {
+        return category + "," + to_string(amount) + "," + note + "\n";
+    }
+
+    static Transaction fromFileString(const string &line) {
+        string c, a, n;
+        size_t pos1 = line.find(',');
+        size_t pos2 = line.find(',', pos1 + 1);
+
+        if (pos1 == string::npos || pos2 == string::npos)
+            return Transaction("Invalid", 0.0, "Corrupt");
+
+        c = line.substr(0, pos1);
+        a = line.substr(pos1 + 1, pos2 - pos1 - 1);
+        n = line.substr(pos2 + 1);
+        return Transaction(c, stod(a), n);
+    }
+};
+
+class ExpenseTracker {
+private:
+    vector<Transaction> transactions;
+    const string filename = "expenses.txt";
+
+    void loadFromFile() {
+        ifstream fin(filename);
+        if (!fin.is_open()) return;
+
+        string line;
+        while (getline(fin, line)) {
+            if (!line.empty())
+                transactions.push_back(Transaction::fromFileString(line));
+        }
+        fin.close();
+    }
+
+    void saveToFile() const {
+        ofstream fout(filename);
+        for (const auto &t : transactions)
+            fout << t.toFileString();
+        fout.close();
+    }
+
+public:
+    ExpenseTracker() {
+        loadFromFile();
+    }
+
+    void addTransaction() {
+        string category, note;
+        double amount;
+        cout << "\nEnter category: ";
+        cin.ignore();
+        getline(cin, category);
+        cout << "Enter amount: ";
+        cin >> amount;
+        cin.ignore();
+        cout << "Enter note: ";
+        getline(cin, note);
+
+        transactions.push_back(Transaction(category, amount, note));
+        saveToFile();
+        cout << "\n✅ Transaction added successfully!\n";
+    }
+
+    void viewAll() const {
+        if (transactions.empty()) {
+            cout << "\nNo transactions recorded yet.\n";
+            return;
+        }
+        cout << "\n================= All Transactions =================\n";
+        cout << left << setw(15) << "Category" << setw(10) << "Amount" << setw(25) << "Note" << endl;
+        cout << "----------------------------------------------------\n";
+        for (const auto &t : transactions)
+            t.display();
+    }
+
+    void viewSummary() const {
+        if (transactions.empty()) {
+            cout << "\nNo transactions available.\n";
+            return;
+        }
+        double total = 0;
+        for (const auto &t : transactions)
+            total += t.getAmount();
+
+        cout << "\nTotal Transactions: " << transactions.size();
+        cout << "\nTotal Amount: ₹" << fixed << setprecision(2) << total << endl;
+    }
+
+    void searchByCategory() const {
+        if (transactions.empty()) {
+            cout << "\nNo transactions available.\n";
+            return;
+        }
+
+        string search;
+        cout << "\nEnter category to search: ";
+        cin.ignore();
+        getline(cin, search);
+
+        bool found = false;
+        cout << "\nTransactions in category \"" << search << "\":\n";
+        cout << left << setw(15) << "Category" << setw(10) << "Amount" << setw(25) << "Note" << endl;
+        cout << "----------------------------------------------------\n";
+        for (const auto &t : transactions) {
+            if (t.getCategory() == search) {
+                t.display();
+                found = true;
+            }
+        }
+        if (!found)
+            cout << "No transactions found in this category.\n";
+    }
+
+    void deleteTransaction() {
+        if (transactions.empty()) {
+            cout << "\nNo transactions to delete.\n";
+            return;
+        }
+
+        viewAll();
+        cout << "\nEnter transaction number to delete (1 - " << transactions.size() << "): ";
+        int index;
+        cin >> index;
+
+        if (index < 1 || index > (int)transactions.size()) {
+            cout << "❌ Invalid index!\n";
+            return;
+        }
+
+        transactions.erase(transactions.begin() + index - 1);
+        saveToFile();
+        cout << "✅ Transaction deleted successfully.\n";
+    }
+};
+
+int main() {
+    ExpenseTracker tracker;
+    int choice;
+
+    while (true) {
+        cout << "\n================= Expense Tracker =================";
+        cout << "\n1. Add Transaction";
+        cout << "\n2. View All Transactions";
+        cout << "\n3. View Summary";
+        cout << "\n4. Search by Category";
+        cout << "\n5. Delete a Transaction";
+        cout << "\n6. Exit";
+        cout << "\n===================================================";
+        cout << "\nEnter your choice: ";
+        cin >> choice;
+
+        switch (choice) {
+            case 1: tracker.addTransaction(); break;
+            case 2: tracker.viewAll(); break;
+            case 3: tracker.viewSummary(); break;
+            case 4: tracker.searchByCategory(); break;
+            case 5: tracker.deleteTransaction(); break;
+            case 6:
+                cout << "\n💾 Data saved. Exiting... Goodbye!\n";
+                return 0;
+            default:
+                cout << "\nInvalid choice! Try again.\n";
+        }
+    }
+}