Basic User Authentication System in C

Introduction:

• Introduce the concept of user authentication systems.

• Mention the importance of user authentication in software applications.

• Briefly describe the purpose and functionality of the code.

Code Overview:

• Explain the purpose of each header file included (stdio.h, stdlib.h, string.h).

• Define the maximum number of users, maximum username length, and maximum password length using #define.

• Define a structure User to store user information (username and password).

• Declare an array of User structs to hold user data and a variable numUsers to track the number of registered users.

Functions:

Signup Function:

1. Check if the maximum user limit has been reached.

2. Prompt the user to enter a username and password.

3. Store the user's information in the array of users.

4. Increment numUsers and display a success message.

void signup() {
    // Code for signup function
}

Login Function

1. Prompt the user to enter their username and password.

2. Iterate through the array of users to find a matching username and password.

3. If found, display a success message; otherwise, indicate a failed login.

int login() {
    // Code for login function
}

Title: Building a Basic User Authentication System in C

Subtitle: A Beginner's Guide to Building a Secure User Authentication System in C

Introduction

• Introduce the concept of user authentication systems.

• Mention the importance of user authentication in software applications.

• Briefly describe the purpose and functionality of the code.

Code Overview

• Explain the purpose of each header file included (stdio.h, stdlib.h, string.h).

• Define the maximum number of users, maximum username length, and maximum password length using #define.

• Define a structure User to store user information (username and password).

• Declare an array of User structs to hold user data and a variable numUsers to track the number of registered users.

Functions

1. Signup Function

   • Check if the maximum user limit has been reached.

   • Prompt the user to enter a username and password.

   • Store the user's information in the array of users.

   • Increment numUsers and display a success message.

        void signup() {
            // Code for signup function
        }

2. Login Function

   • Prompt the user to enter their username and password.

   • Iterate through the array of users to find a matching username and password.

   • If found, display a success message; otherwise, indicate a failed login.

      int login() {
          // Code for login function
      }

Main Function:

1. Present a menu to the user with options for signup, login, and exit.

2. Handle user input using a do-while loop and a switch statement.

3. Call the appropriate functions based on the user's choice.

Explain
int main() {
    int choice, accountNumber, toAccount;
    float amount;

    do {
        printf("\nBanking System Menu:\n");
        printf("1. Create Account\n");
        printf("2. Deposit\n");
        printf("3. Withdraw\n");
        printf("4. Transfer\n");
        printf("5. View Transactions\n");
        printf("6. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
}

Conclusion:

1. Summarize the purpose and functionality of the code.

2. Highlight the importance of user authentication in software development.

3. Encourage further exploration and customization of the code for real-world applications.

Final Thoughts:

• Share any additional resources or references related to user authentication in C.

• Invite feedback and questions from readers.

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