Password program

//create a program of password 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>

// A function to generate a random password of given length
char* generate_password(int length) {
  // Define the characters that can be used in the password
  char chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()_+-=";
  // Get the size of the chars array
  int size = strlen(chars);
  // Allocate memory for the password string
  char* password = (char*)malloc((length + 1) * sizeof(char));
  // Use a random seed based on the current time
  srand(time(NULL));
  // Loop through the length of the password
  for (int i = 0; i < length; i++) {
    // Generate a random index from 0 to size - 1
    int index = rand() % size;
    // Assign the corresponding character to the password string
    password[i] = chars[index];
  }
  // Add a null terminator at the end of the password string
  password[length] = '\0';
  // Return the password string
  return password;
}

// A function to check if a given password is valid or not
int check_password(char* password) {
  // Define the minimum length of the password
  int min_length = 8;
  // Define the flags for different types of characters
  int has_upper = 0;
  int has_lower = 0;
  int has_digit = 0;
  int has_symbol = 0;
  // Get the length of the password
  int length = strlen(password);
  // Loop through the password characters
  for (int i = 0; i < length; i++) {
    // Check if the character is an uppercase letter
    if (password[i] >= 'A' && password[i] <= 'Z') {
      has_upper = 1;
    }
    // Check if the character is a lowercase letter
    else if (password[i] >= 'a' && password[i] <= 'z') {
      has_lower = 1;
    }
    // Check if the character is a digit
    else if (password[i] >= '0' && password[i] <= '9') {
      has_digit = 1;
    }
    // Check if the character is a symbol
    else {
      has_symbol = 1;
    }
  }
  // Return true if the password meets all the criteria, false otherwise
  return (length >= min_length && has_upper && has_lower && has_digit && has_symbol);
}

// The main function of the program
int main() {
  // Declare a variable to store the user's choice
  int choice;
  // Declare a variable to store the user's password
  char* password;
  
   do {
     // Print the menu options
     printf("Welcome to Password Security Program\n");
     printf("1. Generate a random password\n");
     printf("2. Check your own password\n");
     printf("3. Exit\n");
     printf("Enter your choice: ");
     // Scan the user's choice
     scanf("%d", &choice);
     // Switch on the user's choice
     switch (choice) {
       case 1:
         // Generate a random password of length 10 and print it
         password = generate_password(10);
         printf("Your random password is: %s\n", password);
         // Free the memory allocated for the password
         free(password);
         break;
       case 2:
         // Ask the user to enter their own password and scan it
         printf("Enter your own password: ");
         scanf("%s", password);
         // Check if the password is valid or not and print the result
         if (check_password(password)) {
           printf("Your password is valid.\n");
         }
         else {
           printf("Your password is invalid.\n");
         }
         break;
       case 3:
         // Exit the program with a message
         printf("Thank you for using Password Security Program. Goodbye!\n");
         break;
       default:
         // Print an error message for invalid choice
         printf("Invalid choice. Please try again.\n");
         break;
     }
   } while (choice !=3); // Repeat until the user chooses to exit
   
   return(0); 
}