Expense Tracker in C

C/Expense_Tracker/Expense-tracker.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#define MAX_CATEGORY_LEN 50
+#define MAX_LINE_LEN 256
+#define FILENAME "expenses.csv"
+
+typedef struct {
+    char date[11];
+    double amount;
+    char category[MAX_CATEGORY_LEN];
+} Expense;
+
+void clearInputBuffer() {
+    int c;
+    while ((c = getchar()) != '\n' && c != EOF);
+}
+
+void getCurrentDate(char *dateStr) {
+    time_t t = time(NULL);
+    struct tm *tm_info = localtime(&t);
+    strftime(dateStr, 11, "%Y-%m-%d", tm_info);
+}
+
+void initializeFile() {
+    FILE *file = fopen(FILENAME, "r");
+    if (file == NULL) {
+        file = fopen(FILENAME, "w");
+        if (file != NULL) {
+            fprintf(file, "Date,Amount,Category\n");
+            fclose(file);
+            printf("Created new expense file: %s\n\n", FILENAME);
+        } else {
+            printf("Error creating file!\n");
+        }
+    } else {
+        fclose(file);
+    }
+}
+
+void addExpense() {
+    Expense exp;
+    FILE *file;
+
+    getCurrentDate(exp.date);
+
+    printf("\n=== Add New Expense ===\n");
+    printf("Date: %s (today)\n", exp.date);
+
+    printf("Enter amount: $");
+    if (scanf("%lf", &exp.amount) != 1 || exp.amount <= 0) {
+        printf("Invalid amount! Please enter a positive number.\n");
+        clearInputBuffer();
+        return;
+    }
+    clearInputBuffer();
+
+    printf("Enter category: ");
+    if (fgets(exp.category, MAX_CATEGORY_LEN, stdin) == NULL) {
+        printf("Error reading category!\n");
+        return;
+    }
+    exp.category[strcspn(exp.category, "\n")] = 0;
+
+    if (strlen(exp.category) == 0) {
+        printf("Category cannot be empty!\n");
+        return;
+    }
+
+    file = fopen(FILENAME, "a");
+    if (file == NULL) {
+        printf("Error opening file!\n");
+        return;
+    }
+
+    fprintf(file, "%s,%.2f,%s\n", exp.date, exp.amount, exp.category);
+    fclose(file);
+
+    printf("\n✓ Expense added successfully!\n");
+    printf("  Date: %s\n", exp.date);
+    printf("  Amount: $%.2f\n", exp.amount);
+    printf("  Category: %s\n", exp.category);
+}
+
+void viewExpenses() {
+    FILE *file;
+    char line[MAX_LINE_LEN];
+    int count = 0;
+    double total = 0.0;
+
+    file = fopen(FILENAME, "r");
+    if (file == NULL) {
+        printf("No expenses found! File doesn't exist.\n");
+        return;
+    }
+
+    printf("\n=== All Expenses ===\n");
+    printf("%-12s %-12s %-20s\n", "Date", "Amount", "Category");
+    printf("------------------------------------------------\n");
+
+    fgets(line, MAX_LINE_LEN, file);
+
+    while (fgets(line, MAX_LINE_LEN, file) != NULL) {
+        char date[11];
+        double amount;
+        char category[MAX_CATEGORY_LEN];
+
+        char *token = strtok(line, ",");
+        if (token != NULL) strcpy(date, token);
+
+        token = strtok(NULL, ",");
+        if (token != NULL) amount = atof(token);
+
+        token = strtok(NULL, "\n");
+        if (token != NULL) strcpy(category, token);
+
+        printf("%-12s $%-11.2f %-20s\n", date, amount, category);
+        total += amount;
+        count++;
+    }
+
+    fclose(file);
+
+    printf("------------------------------------------------\n");
+    printf("Total Expenses: %d\n", count);
+    printf("Total Amount: $%.2f\n", total);
+}
+
+void viewSummaryByCategory() {
+    FILE *file;
+    char line[MAX_LINE_LEN];
+
+    typedef struct {
+        char category[MAX_CATEGORY_LEN];
+        double total;
+        int count;
+    } CategorySummary;
+
+    CategorySummary summaries[100];
+    int numCategories = 0;
+
+    file = fopen(FILENAME, "r");
+    if (file == NULL) {
+        printf("No expenses found!\n");
+        return;
+    }
+
+    fgets(line, MAX_LINE_LEN, file);
+
+    while (fgets(line, MAX_LINE_LEN, file) != NULL) {
+        char category[MAX_CATEGORY_LEN];
+        double amount;
+
+        strtok(line, ",");
+        char *token = strtok(NULL, ",");
+        if (token != NULL) amount = atof(token);
+
+        token = strtok(NULL, "\n");
+        if (token != NULL) strcpy(category, token);
+
+        int found = 0;
+        for (int i = 0; i < numCategories; i++) {
+            if (strcmp(summaries[i].category, category) == 0) {
+                summaries[i].total += amount;
+                summaries[i].count++;
+                found = 1;
+                break;
+            }
+        }
+
+        if (!found && numCategories < 100) {
+            strcpy(summaries[numCategories].category, category);
+            summaries[numCategories].total = amount;
+            summaries[numCategories].count = 1;
+            numCategories++;
+        }
+    }
+
+    fclose(file);
+
+    printf("\n=== Expense Summary by Category ===\n");
+    printf("%-20s %-12s %-10s\n", "Category", "Total", "Count");
+    printf("------------------------------------------------\n");
+
+    for (int i = 0; i < numCategories; i++) {
+        printf("%-20s $%-11.2f %d\n", 
+               summaries[i].category, 
+               summaries[i].total, 
+               summaries[i].count);
+    }
+}
+
+void displayMenu() {
+    printf("\n╔════════════════════════════════════╗\n");
+    printf("║     EXPENSE TRACKER MENU          ║\n");
+    printf("╠════════════════════════════════════╣\n");
+    printf("║ 1. Add Expense                    ║\n");
+    printf("║ 2. View All Expenses              ║\n");
+    printf("║ 3. View Summary by Category       ║\n");
+    printf("║ 4. Exit                           ║\n");
+    printf("╚════════════════════════════════════╝\n");
+    printf("Choose an option: ");
+}
+
+int main() {
+    int choice;
+
+    printf("╔════════════════════════════════════╗\n");
+    printf("║   WELCOME TO EXPENSE TRACKER      ║\n");
+    printf("╚════════════════════════════════════╝\n\n");
+
+    initializeFile();
+
+    while (1) {
+        displayMenu();
+
+        if (scanf("%d", &choice) != 1) {
+            printf("Invalid input! Please enter a number.\n");
+            clearInputBuffer();
+            continue;
+        }
+        clearInputBuffer();
+
+        switch (choice) {
+            case 1:
+                addExpense();
+                break;
+            case 2:
+                viewExpenses();
+                break;
+            case 3:
+                viewSummaryByCategory();
+                break;
+            case 4:
+                printf("\nThank you for using Expense Tracker!\n");
+                printf("Your expenses are saved in '%s'\n", FILENAME);
+                return 0;
+            default:
+                printf("Invalid choice! Please select 1-4.\n");
+        }
+    }
+
+    return 0;
+}

C/Expense_Tracker/Readme.md

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+Expense Tracker (C Program)
+
+A simple and lightweight command-line Expense Tracker written in C.
+It allows you to record, view, and summarize expenses by category — all stored in a CSV file for easy access.
+
+Features
+
+Automatically records the current date
+Add new expenses with amount and category
+Stores data in a expenses.csv file
+View all recorded expenses in a tabular format
+
+Summary of expenses grouped by category
+
+Persistent data across sessions (CSV-based)
+
+File Structure
+.
+├─ expense_tracker.c    # Source code
+└─ readme.md
+
+How to Compile & Run
+
+Make sure you have a C compiler installed (like GCC).
+
+Compile:
+gcc expense_tracker.c -o expense_tracker
+
+Run:
+./expense_tracker
+
+CSV Format
+
+The program automatically generates expenses.csv (if not present) with the following header:
+
+Date,Amount,Category
+2025-10-30,199.99,Groceries
+2025-10-31,550.00,Travel
+...
+
+
+This means you can open it directly in Excel, Google Sheets, or any data analytics tool.
+
+Menu Options
+
+When you run the program, you'll see:
+
+1. Add Expense
+2. View All Expenses
+3. View Summary by Category
+4. Exit
+
+Add Expense
+
+Enter amount
+
+Enter category
+
+Date auto-fills to today
+
+Example:
+
+Enter amount: $250
+Enter category: Utilities
+Expense added successfully!
+View All Expenses
+
+Displays all recorded entries:
+
+Date         Amount       Category
+2025-10-30   $250.00      Utilities
+
+
+Additionally shows:
+
+Total expense count
+
+Overall amount spent
+
+Summary by Category
+
+Groups expenses by category:
+
+Category             Total        Count
+Groceries            $500.00      3
+Travel               $550.00      1
+
+Persistent Storage
+
+All expenses are permanently saved inside expenses.csv, so nothing is lost when the program closes.
+
+Concepts Used
+
+File handling (fopen, fprintf, fgets)
+
+String tokenization (strtok)
+
+Structs for data modeling
+
+Looping, conditions, and input validation
+
+Basic memory-safe input cleanup
+Input Validation
+
+The program prevents:
+
+Negative/zero amounts
+Empty categories
+Invalid main menu input
+
+Future Enhancements (Ideas)
+
+Delete/Update expenses
+
+Filter by date range
+
+Export monthly/annual summaries
+
+Category-wise budgeting
+
+Graphical visualization using Python integration
+
+Author
+
+Developed as a simple terminal-based expense management utility written in C.