BroBank Project

A command-line banking app you build in C — step by step, week by week. No graphics, just pure code that works.

Project information

5 weeks

Project duration

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C

Language

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CLI

Interface

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Project walkthrough

Open the original interactive BroBank explainer

Startup and login

User launches the program. The program greets the user and asks for a PIN to authenticate.

$ ./brobank
==============================
Welcome to BroBank CLI!
Enter PIN:

Main menu

A switch-driven menu appears. Built with a switch() statement — each number maps to one feature.

1  Create account
2  Deposit
3  Withdraw
4  View balance
5  Transfer
6  View history
0  Exit

Deposit flow

User types 2, then enters an amount → the C function deposit() validates input → the balance is updated.

Enter deposit amount:

Input validation

What happens when users make mistakes?

Data modeling — Week 4

Structs hold each account’s data. An array of Account structs stores all users in memory — saved to a file in Week 5.

struct Account {
    int id;
    char name[50];
    float balance;
    int pin;
};

Save and load — Week 5

Data survives after the program exits. Accounts, balances and transaction history move between program memory (RAM) and the disk file brobank.dat using fwrite() and fread().

fwrite(&accounts, sizeof(Account), count, file);

Final product

By Week 5 you have a fully working CLI banking app with accounts, transactions, validation, and file persistence.

5 weeks · 6 features · 1 app

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