/*********************************************************
 * From C PROGRAMMING: A MODERN APPROACH, Second Edition *
 * By K. N. King                                         *
 * Copyright (c) 2008, 1996 W. W. Norton & Company, Inc. *
 * All rights reserved.                                  *
 * This program may be freely distributed for class use, *
 * provided that this copyright notice is retained.      *
 *********************************************************/

/* checking.c (Chapter 6, page 115) */
/* Balances a checkbook */

#include <stdio.h>

int main(void)
{
  int cmd;
  float balance = 0.0f, credit, debit;

  printf("*** ACME checkbook-balancing program ***\n");
  printf("Commands: 0=clear, 1=credit, 2=debit, ");
  printf("3=balance, 4=exit\n\n");

  for (;;) {
    printf("Enter command: ");
    scanf("%d", &cmd);
    switch (cmd) {
      case 0:
        balance = 0.0f;
        break;
      case 1:
        printf("Enter amount of credit: ");
        scanf("%f", &credit);
        balance += credit;
        break;
      case 2:
        printf("Enter amount of debit: ");
        scanf("%f", &debit);
        balance -= debit;
        break;
      case 3:
        printf("Current balance: $%.2f\n", balance);
        break;
      case 4:
        return 0;
      default:
        printf("Commands: 0=clear, 1=credit, 2=debit, ");
        printf("3=balance, 4=exit\n\n");
        break;
    }
  }
}