balance1.c

The art and science of c_source code!

/*
 * File: balance1.c
 * ----------------
 * This file contains the first version of a program to
 * balance a checkbook.  The user enters checks and deposits
 * throughout the month (checks are entered as negative
 * numbers).  The end of the input is indicated by entering
 * 0 as a sentinel value.
 */

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

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;
        printf("Current balance = %g\n", balance);
    }
    printf("Final balance = %g\n", balance);
}