authentication_system.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int check_authentication(char* password)
{
    int auth_flag = 0;
    char password_buffer[30];
    
    strcpy(password_buffer, password);
    
    if (strcmp(password_buffer, "ihaveaverystrongpassword") == 0)
        auth_flag = 1;
    
    if (strcmp(password_buffer, "thisisasuperstrongpassword") == 0)
        auth_flag = 1;
    
    return auth_flag;
}


int main(int argc, char* argv[])
{
    // Checking for correct input format
    if (argc < 2) {
        printf("Usage: %s <password>\n", argv[0]);
        exit(0);
    }
    
    // Authenticating the password
    if (check_authentication(argv[1])) {
        printf("Access Granted.\n");
    }
    else {
        printf("Access Denied.\n");
    }
}