Accessing data imported from file into the program

[howardbc14]

Thanks for your help!

Given that I have read the following into the console,
Vladimir Ivanov 1233433 [email protected] 143343
John Cass 132232 [email protected] 1434334343

In the following function (remit_money), I want to be able to compare the file data to the user input (when he/she sends money, he/she obviously must identify the transferee by name). How would I access the string Vladimir?

#include <stdio.h>

#include <string.h>

#include <stdlib.h>
#include <time.h>
 
void startup_message();
void login_process();
void menu_and_startup();
void add_transferees();
void view_transferees();
void remit_money();
void thank_you_message();
 
int main ()
{
    startup_message();
     
    login_process();
     
    menu_and_startup();
     
    return 0;
}
 
void startup_message()
{
    printf("Welcome to the newly introduced smsTransfer© (remittances through SMS text messaging)!\n");
    printf("a joint project of PioneerBank and Globe Telecom!\n");
    printf("REMINDER: Both the transferers and the transferees must have active accounts with both companies to take part in this service.\n\n");
}
 
void login_process()
{
    char username[10];
    char correct_username[10];
    char second_part_of_correct_username[5];
    char firstname[10];
    char lastname[20];
    long long int cin;
    long long int correct_password;
    long long int password;
    short int attempts=0;
 
    printf("Enter your first name:\n");
    scanf("%s",firstname);
 
    strncpy(correct_username,firstname,2);
    correct_username[2]='\0';
 
    printf("Enter your last name:\n");
    scanf("%s",lastname);
 
    strncpy(second_part_of_correct_username,lastname,3);
    second_part_of_correct_username[3]='\0';
    strncat(correct_username,second_part_of_correct_username,5);
     
    printf("Enter your Customer Identification Number(CIN):\n");
    scanf("%llu",&cin);
    correct_password=(cin%10)+1;
     
    printf("Please note that usernames are case sensitive.\n");
    printf("Enter username:\n");
    scanf("%s",&username);
     
    printf("Enter password:\n");
    scanf("%llu",&password);
     
    if ((password==correct_password) && strcmp(username,correct_username)==0)
        {
            printf("Login successful!\n");
        }
     
    while ((password!=correct_password) || strcmp(username,correct_username)!=0)
        {
            printf("\nThe login details are invalid.Please try again.\n");
             
            printf("Enter username:\n");
            scanf("%s",&username);
 
            printf("Enter password:\n");
            scanf("%llu",&password);
             
            attempts++;
             
            if (attempts>=5)
                printf("Too many tries. Please re-enter the program and attempt to complete the login process again.\n");
            if (attempts>=5)
                exit(0);    
             
            if ((password==correct_password) && strcmp(username,correct_username)==0)
                printf("Login successful!\n");
        }
}
 
void menu_and_startup()
{
    short int option;
    do
    {
    printf("___________________________________________\n");
    printf("1. Add transferees\n");
    printf("2. View current transferee list\n");    
    printf("3. Remit money\n");
    printf("4. Account information and settings\n");
    printf("5. Exit the application\n");
    printf("____________________________________________\n");
    printf("Please choose from the above options: \n");
    scanf("%d",&option);    
    switch(option)
        {
            case 1: add_transferees();
                    break;
            case 2: view_transferees();
                    break;
            case 3: remit_money();
                    break;
            case 4: add_transferees();
                    break;
            case 5:    thank_you_message();
                    exit(0);
        }
    } while(option>0 && option<6);
}
 
void add_transferees()
{
  FILE *file;
  int i;
  char firstName[32];
  char lastName[32];
  char email_address[40];
  long long int account_number;
  long int phone_number;
  short int addchoice;
  int found = 0;
 
  file = fopen("transferee_list.txt", "a");
  if (!file)
  {
    printf("File could not be opened\n\a\a");
    getchar();
    exit(-1);
  }
   
  printf("Enter number of transferees you wish to add:\n");
  scanf("%d",&addchoice);
   
  for (i = 0; i<addchoice; ++i)
  {
    printf("Transferee #%d\n", i+1);
     
    printf("Enter first name:\n"); scanf("%s", &firstName);
    printf("Enter last name:\n"); scanf("%s", &lastName);
    printf("Enter PioneerBank account number:\n"); scanf("%llu", &account_number);
    printf("Enter e-mail address:\n"); scanf("%s", &email_address);
    printf("Enter Globe Telecom phone number:\n"); scanf("%lu",&phone_number);
    printf("\n");
 
    fprintf(file, "%s\t%s\t%llu\t%s\t%lu\n", firstName, lastName,account_number,email_address,phone_number);
  }
   
  printf("Transferee list successfully updated!\n");
   
  fclose(file);
}
 
void view_transferees()
{
  char firstName[32];
  char lastName[32];
  char email_address[40];
  long long int account_number;
  long int phone_number;
  int found=0;
   
  FILE *file;
  file = fopen("transferee_list.txt", "r");
  if (!file)
  {
    printf("File could not be opened\n\a\a");
    exit(-1);
  }
 
  else
  {
    fscanf(file, "%s\t%s\t%llu\t%s\t%lu", &firstName,&lastName,&account_number,&email_address,&phone_number);
    {
      printf("Current transferees:\n First Name:%s\n Last Name:%s\n Account Number:%llu\n E-mail address:%s\n Phone Number:%lu\n", firstName, lastName, account_number, email_address, phone_number);
      found = 1;
    }
  }
  if (!found)
    printf("Record could not be found");
 
  fclose(file);
}
 
void remit_money()
{
    char transferee_name[30];
    float current_balance;
    float transfer_amount;
     
    printf("\nCurrent chequing amount balance:%.2f",current_balance);
    printf("Please enter the transferee name:");
    scanf("%s",&transferee_name);
    printf("\nEnter the desired transfer amount:$");
    scanf("%.2f",&transfer_amount);
     
    if (transfer_amount<5000 && transfer_amount<current_balance && current_balance-transfer_amount>=10000)    
        current_balance-=transfer_amount;
    while (transfer_amount>=5000)
    {
        printf("In accordance with the Mobile Banking Act of 2024, customers are prohibited from sending amounts in excess of $5,000 per transaction.");
        printf("\nEnter the desired transfer amount:$");
        scanf("%.2f",&transfer_amount);
         
        if (transfer_amount<5000 && transfer_amount<current_balance && current_balance-transfer_amount>=10000)    
                current_balance-=transfer_amount;
    }    
}
 
void thank_you_message()
{
    printf("Thanks for choosing and using smsTransfer©!\n");
}

[Absurd]

You can:
1. open the file with fopen()
2. loop through the lines in the file with fgets()
3. compare first word in line to the given string

BTW, I don't know if you noticed, but I tried to compile your code and there were a lot of warnings.
I personally prefer a code clean from warnings, and I would advice not to ignore them.

main.c: In function ‘login_process’:
main.c:64:2: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[10]’ [-Wformat=]
  scanf("%s", &username);
  ^
main.c:79:3: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[10]’ [-Wformat=]
   scanf("%s", &username);
   ^
main.c: In function ‘menu_and_startup’:
main.c:108:3: warning: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘short int *’ [-Wformat=]
   scanf("%d", &option);
   ^
main.c: In function ‘add_transferees’:
main.c:148:2: warning: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘short int *’ [-Wformat=]
  scanf("%d", &addchoice);
  ^
main.c:154:3: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[32]’ [-Wformat=]
   scanf("%s", &firstName);
   ^
main.c:156:3: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[32]’ [-Wformat=]
   scanf("%s", &lastName);
   ^
main.c:160:3: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[40]’ [-Wformat=]
   scanf("%s", &email_address);
   ^
main.c:138:6: warning: unused variable ‘found’ [-Wunused-variable]
  int found = 0;
      ^
main.c: In function ‘view_transferees’:
main.c:191:5: warning: format ‘%s’ expects argument of type ‘char *’, but argument 3 has type ‘char (*)[32]’ [-Wformat=]
     &account_number, &email_address, &phone_number);
     ^
main.c:191:5: warning: format ‘%s’ expects argument of type ‘char *’, but argument 4 has type ‘char (*)[32]’ [-Wformat=]
main.c:191:5: warning: format ‘%s’ expects argument of type ‘char *’, but argument 6 has type ‘char (*)[40]’ [-Wformat=]
main.c: In function ‘remit_money’:
main.c:213:2: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[30]’ [-Wformat=]
  scanf("%s", &transferee_name);
  ^
main.c:215:2: warning: unknown conversion type character ‘.’ in format [-Wformat=]
  scanf("%.2f", &transfer_amount);
  ^
main.c:215:2: warning: too many arguments for format [-Wformat-extra-args]
main.c:223:3: warning: unknown conversion type character ‘.’ in format [-Wformat=]
   scanf("%.2f", &transfer_amount);
   ^
main.c:223:3: warning: too many arguments for format [-Wformat-extra-args]
main.c:211:8: warning: ‘current_balance’ is used uninitialized in this function [-Wuninitialized]
  printf("\nCurrent chequing amount balance:%.2f", current_balance);