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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <time.h>
  5.  
  6. #define MAX_TRIES 3
  7. #define MAX_NAME 50
  8. #define ACCOUNT_FILE "account.txt"
  9. #define TRANSACTION_FILE "transactions.txt"
  10.  
  11. // Structure to hold account information
  12. typedef struct {
  13.     int accountNumber;
  14.     char name[MAX_NAME];
  15.     int pin;
  16.     float balance;
  17. } Account;
  18.  
  19. // Structure to hold a transaction record
  20. typedef struct {
  21.     char type[10];    // "Deposit" or "Withdrawal"
  22.     float amount;
  23.     char date[11];    // Format: DD/MM/YYYY
  24. } Transaction;
  25.  
  26. // Function prototypes
  27. int login(Account *acc);
  28. void showMenu();
  29. void checkBalance(Account acc);
  30. void deposit(Account *acc);
  31. void withdraw(Account *acc);
  32. void miniStatement();
  33. void changePIN(Account *acc);
  34. void logTransaction(const char *type, float amount);
  35. void loadAccount(Account *acc);
  36. void saveAccount(Account acc);
  37.  
  38. // Entry point of the program
  39. int main() {
  40.     Account user;
  41.     loadAccount(&user);
  42.  
  43.     int attempts = 0;
  44.     int loggedIn = 0;
  45.     while (attempts < MAX_TRIES && !loggedIn) {
  46.         loggedIn = login(&user);
  47.         if (!loggedIn) {
  48.             printf("Incorrect PIN. Try again.\n");
  49.             attempts++;
  50.         }
  51.     }
  52.     if (!loggedIn) {
  53.         printf("Too many failed attempts. Session terminating.\n");
  54.         return 0;
  55.     }
  56.  
  57.     int choice;
  58.     do {
  59.         showMenu();
  60.         printf("Enter your choice: ");
  61.         scanf("%d", &choice);
  62.         switch (choice) {
  63.             case 1: checkBalance(user); break;
  64.             case 2: deposit(&user); break;
  65.             case 3: withdraw(&user); break;
  66.             case 4: miniStatement(); break;
  67.             case 5: changePIN(&user); break;
  68.             case 6: 
  69.                 printf("Thank you for using the ATM. Goodbye!\n");
  70.                 break;
  71.             default:
  72.                 printf("Invalid choice. Please try again.\n");
  73.         }
  74.     } while (choice != 6);
  75.  
  76.     return 0;
  77. }
  78.  
  79. // Reads account information from file into 'acc'
  80. void loadAccount(Account *acc) {
  81.     FILE *file = fopen(ACCOUNT_FILE, "r");
  82.     if (file == NULL) {
  83.         // If file does not exist, create a default user
  84.         acc->accountNumber = 12345;
  85.         strcpy(acc->name, "Huzaifah");
  86.         acc->pin = 1234;
  87.         acc->balance = 5000.0f;
  88.         saveAccount(*acc);
  89.     } else {
  90.         fscanf(file, "%d,%49[^,],%d,%f",
  91.                &acc->accountNumber, acc->name, &acc->pin, &acc->balance);
  92.         fclose(file);
  93.     }
  94. }
  95.  
  96. // Writes updated account information back to file
  97. void saveAccount(Account acc) {
  98.     FILE *file = fopen(ACCOUNT_FILE, "w");
  99.     if (file != NULL) {
  100.         fprintf(file, "%d,%s,%d,%.2f\n",
  101.                 acc.accountNumber, acc.name, acc.pin, acc.balance);
  102.         fclose(file);
  103.     }
  104. }
  105.  
  106. // Handles user login by comparing entered PIN to stored PIN
  107. int login(Account *acc) {
  108.     int inputPIN;
  109.     printf("Enter your 4-digit PIN: ");
  110.     scanf("%d", &inputPIN);
  111.     return inputPIN == acc->pin;
  112. }
  113.  
  114. // Displays the main menu options
  115. void showMenu() {
  116.     printf("\n========= ATM MENU =========\n");
  117.     printf("1. Check Balance\n");
  118.     printf("2. Deposit Money\n");
  119.     printf("3. Withdraw Money\n");
  120.     printf("4. Mini Statement\n");
  121.     printf("5. Change PIN\n");
  122.     printf("6. Exit\n");
  123.     printf("============================\n");
  124. }
  125.  
  126. // Displays the current account balance
  127. void checkBalance(Account acc) {
  128.     printf("Your current balance is ₹%.2f\n", acc.balance);
  129. }
  130.  
  131. // Processes a deposit transaction
  132. void deposit(Account *acc) {
  133.     float amount;
  134.     printf("Enter amount to deposit: ₹");
  135.     scanf("%f", &amount);
  136.     if (amount > 0) {
  137.         acc->balance += amount;
  138.         saveAccount(*acc);
  139.         logTransaction("Deposit", amount);
  140.         printf("Deposit successful. New balance: ₹%.2f\n", acc->balance);
  141.     } else {
  142.         printf("Invalid amount. Please enter a positive value.\n");
  143.     }
  144. }
  145.  
  146. // Processes a withdrawal transaction
  147. void withdraw(Account *acc) {
  148.     float amount;
  149.     printf("Enter amount to withdraw: ₹");
  150.     scanf("%f", &amount);
  151.     if (amount > 0 && amount <= acc->balance) {
  152.         acc->balance -= amount;
  153.         saveAccount(*acc);
  154.         logTransaction("Withdrawal", amount);
  155.         printf("Please collect your cash. New balance: ₹%.2f\n", acc->balance);
  156.     } else {
  157.         printf("Error: Insufficient balance or invalid amount.\n");
  158.     }
  159. }
  160.  
  161. // Displays the last 5 transactions from the transaction file
  162. void miniStatement() {
  163.     FILE *file = fopen(TRANSACTION_FILE, "r");
  164.     if (file == NULL) {
  165.         printf("No transactions found.\n");
  166.         return;
  167.     }
  168.     // Read all transactions into memory
  169.     Transaction records[100];
  170.     int count = 0;
  171.     while (fscanf(file, "%9[^,],%f,%10s\n",
  172.                   records[count].type,
  173.                   &records[count].amount,
  174.                   records[count].date) == 3 && count < 100) {
  175.         count++;
  176.     }
  177.     fclose(file);
  178.  
  179.     printf("----- Mini Statement -----\n");
  180.     int start = (count < 5) ? 0 : count - 5;
  181.     for (int i = count - 1; i >= start; i--) {
  182.         printf("%s ₹%.2f on %s\n",
  183.                records[i].type, records[i].amount, records[i].date);
  184.     }
  185.     printf("--------------------------\n");
  186. }
  187.  
  188. // Allows the user to change their PIN securely
  189. void changePIN(Account *acc) {
  190.     int oldPIN, newPIN, confirmPIN;
  191.     printf("Enter your current PIN: ");
  192.     scanf("%d", &oldPIN);
  193.     if (oldPIN != acc->pin) {
  194.         printf("Incorrect current PIN.\n");
  195.         return;
  196.     }
  197.     printf("Enter your new PIN: ");
  198.     scanf("%d", &newPIN);
  199.     printf("Confirm your new PIN: ");
  200.     scanf("%d", &confirmPIN);
  201.     if (newPIN == confirmPIN && newPIN != oldPIN) {
  202.         acc->pin = newPIN;
  203.         saveAccount(*acc);
  204.         printf("PIN changed successfully.\n");
  205.     } else {
  206.         printf("PIN change failed. PINs did not match or new PIN equals old PIN.\n");
  207.     }
  208. }
  209.  
  210. // Appends a transaction record to the transaction log file
  211. void logTransaction(const char *type, float amount) {
  212.     FILE *file = fopen(TRANSACTION_FILE, "a");
  213.     if (file != NULL) {
  214.         time_t t = time(NULL);
  215.         struct tm tm = *localtime(&t);
  216.         char date[11];
  217.         snprintf(date, sizeof(date), "%02d/%02d/%04d",
  218.                  tm.tm_mday, tm.tm_mon + 1, tm.tm_year + 1900);
  219.         fprintf(file, "%s,%.2f,%s\n", type, amount, date);
  220.         fclose(file);
  221.     }
  222. }
  223.  
  224.  
Success #stdin #stdout 0.01s 5292KB
comments (?)
stdin
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/*  Berechnung des Hamming-Abstandes zwischen zwei 128-Bit Werten in 	*/
/*	einer Textdatei. 													*/
/*  Die Werte müssen auf einer separaten Zeile gespeichert sein			*/
/* 																		*/
/*	Erstellt: 17.5.2010													*/
/*  Autor: Thomas Scheffler												*/

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

#define ARRAY_SIZE 32

unsigned Hamdist(unsigned x, unsigned y)
{
  unsigned dist = 0, val = x ^ y;
 
  // Count the number of set bits
  while(val)
  {
    ++dist; 
    val &= val - 1;
  }
 
  return dist;
}



int main (void)
{
	char hex;
	int i;
	int a[ARRAY_SIZE];
	int b[ARRAY_SIZE];
	int hamDist = 0;
	FILE* fp;
	
	//Arrays mit 0 initialisieren
	for (i = 0; i < ARRAY_SIZE; ++i)
	{
  		a[i] = 0;
  		b[i] = 0;
	}

	
	fp = fopen("hex.txt","r");
	if (fp == NULL) 
	{
		printf("Die Datei hex.txt wurde nicht gefunden!");
		exit(EXIT_FAILURE);
	}

	i=0;
	printf("1.Zeile einlesen.\n");

 	while((hex=fgetc(fp))!='\n' && hex != EOF)
    {
        a[i]=strtol(&hex,0,16);
		i++;
    }
	i=0;
	printf("2.Zeile einlesen.\n");

 	while((hex=fgetc(fp))!='\n' && hex != EOF)
    {
    	b[i]=strtol(&hex,0,16);
        i++;
    }
	fclose(fp);

	printf("Hamming-Abweichung pro Nibble:\n");
	for (i = 0; i < ARRAY_SIZE; ++i)
	{
		printf ("%i\t%i\t%i\n",a[i],b[i],Hamdist(a[i],b[i]));
		hamDist += Hamdist(a[i],b[i]);
	}
	printf ("\nHamming-Abweichung der Hash-Werte:%d\n",hamDist);
}
stdout
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Enter your 4-digit PIN: Incorrect PIN. Try again.
Enter your 4-digit PIN: Incorrect PIN. Try again.
Enter your 4-digit PIN: Incorrect PIN. Try again.
Too many failed attempts. Session terminating.
https://ideone.com/yL9gjQ
language:
C (clang 8.0)
created:
8 hours ago
visibility:
public

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