balance4.c

来自「The art and science of c_source code!」· C语言 代码 · 共 48 行

/*
 * File: balance4.c
 * ----------------
 * This file contains the final version of a program to
 * balance a checkbook.
 */

#include <stdio.h>
#include "genlib.h"
#include "simpio.h"

/*
 * Constant: BouncedCheckFee
 * -------------------------
 * To change the charge assessed for bounced checks, change
 * the definition of this constant.  The constant must be a
 * floating-point value (i.e., must contain a decimal point).
 */

#define BouncedCheckFee 10.00

/* Main program */

main()
{
    double entry, balance;

    printf("This program helps you balance your checkbook.\n");
    printf("Enter each check and deposit during the month.\n");
    printf("To indicate a check, use a minus sign.\n");
    printf("Signal the end of the month with a 0 value.\n");
    printf("Enter the initial balance: ");
    balance = GetReal();
    while (TRUE) {
        printf("Enter check (-) or deposit: ");
        entry = GetReal();
        if (entry == 0) break;
        balance += entry;
        if (entry < 0 && balance < 0) {
            printf("This check bounces.  $%.2f fee deducted.\n",
                   BouncedCheckFee);
            balance -= BouncedCheckFee;
        }
        printf("Current balance = %.2f\n", balance);
    }
    printf("Final balance = %.2f\n", balance);
}