Question

Java programming...

How can I use the same method with the same variables to calculate different sales in one transaction?
I mean I made a method that ask for info and calculate the info to make one sale, but I want to use it again to make multiple sales... The thing is that the variable will be store just the last sale so the first sale wont appear in the print screen? What should I do?

Answer 1

Load the individual sales into an array local to that method, then return that array of sales to a print function at the end of the loop.

Answer 2

What exactly are you trying to make? Like a cash register?

Answer 3

yeah exactly..

Answer 4

Gimme a second.

Answer 5

Sorry, had to find an old program.


//this function calculates the net sale
public void CalcNetsale (int count, double tax[], double sale[],
double net_sale[]) {
int C; //loop control variable
for(C = 0; C < count; C++)
net_sale[C] = tax[C] + value[C];
}


You could insert a print in the loop if you want.

Answer 6

this is part of the code... that's the code I want to reuse..

Answer 7

//* This class ask for info and calculate the transaction*/

import java.util.Scanner;


public class Transaction {
//* asking cashier for info*/
public void info(){

String title;
double code , price, quantity, dsct, total;

Scanner sc = new Scanner(System.in);

System.out.println("Enter DVD TITLE: ");
title = sc.nextLine();

System.out.println("Enter DVD ID CODE: ID#");
code = sc.nextDouble();

System.out.println("Enter DVD PRICE: $");
price = sc.nextDouble();

System.out.println("Enter DVD QUANTITY: x");
quantity = sc.nextDouble();

//* Finding the Total*/

total = (price * quantity);

if ((quantity >= 5 )&(quantity <= 9)){ dsct = (total * 12)/100 ;}

else if ((quantity >= 10 )&(quantity <= 14)){ dsct = (total * 17)/100 ;}

else if (quantity >= 15 ){dsct = (total * 25)/100 ;}

else { dsct =0;}

total = total - dsct;

System.out.println("TOTAL $" + total);

}
}

Answer 8

So what do you want to add to it?

Answer 9

Ugh. This site needs [code] tags

Answer 10

I just want to reuse it to make multiple transactions..

Answer 11

Do you know what an array is?

Answer 12

yeah kinda..
ive never used it but I know is a multiple string or something like that

Answer 13

Ok. I assume this is for school. Are you allowed to use one at this point? Some professors take points off if they feel you are trying to "skip ahead."

Answer 14

Well Actually I am studying by my own...

Answer 15

String [] products;
products = new String [2]:
products[0]= first Sale;

Answer 16

I dont know how to use it in this case...

Answer 17

Ok. Check this out. Everything your doing in that program up there is just allocating some computer memory so you can write stuff down, and then letting the computer do just that. All an array is, is like a group of that memory allocation in a line. You play with fireworks as a kid? You know the string of black-cats? Think of an array like that, only filled with information instead of gunpowder.

Answer 18

You have created this application that calculates a sale. Now instead of dealing with one sale at a time you want it to deal with several, correct?

Answer 19

yeah

Answer 20

Ok. So what we'll do is we will create an array of sales.

Answer 21

What exactly do you want to keep track of? The variable total?

Answer 22

go to the group chat please

Answer 23

//**This is a program for a Case Study on Facebook about a DVD Store Cashier*/
//** Pogram Version 1.0.0*/
//** Jose R. Camilo 7/2/2011*/

//** This method makes a Salutation*/


import java.util.Date;
import java.util.Scanner;


public class MainSales {
public static void main(String args[]){


java.util.Date CDate = new Date(); //Fecha actual del sistema


//* Salutation */
System.out.println("Andora Video");
System.out.println(CDate);
System.out.println("Welcome");

//*calling "Transaction" class*/

int a = 0;
int b= 0;

while (a != 1) {
System.out.println("New Transcation?");
System.out.println("Yes press 1");

Scanner sc = new Scanner(System.in);
a = sc.nextInt();
}

if (a == 1){
Transaction TransactionObject = new Transaction();
TransactionObject.info();


System.out.println("Press 1 to add more sales. Press 2 to continue.");

Scanner sc = new Scanner(System.in);
b = sc.nextInt();

if (b == 1){ // call transaction method again
}
}
}

}

Answer 24

import java.util.Scanner;
class sales
{
public static void main(String arg[])
{
char ch;
String title;
double code,price,quantity;
do
{
Scanner sc=new Scanner(System.in);
System.out.println("Enter DVD TITLE: "); // taking input info about the DVD
title = sc.nextLine();
System.out.println("Enter DVD ID CODE: ID#");
code = sc.nextDouble();
System.out.println("Enter DVD PRICE: $");
price = sc.nextDouble();
System.out.println("Enter DVD QUANTITY: x");
quantity = sc.nextDouble();
salescalc(title,code,price,quantity); // calling the method to calculate the total
System.out.print("Do you want more sales Y or N"); // this line asks you if you want to make more sales transaction
String str=sc.next();//Inputs String // stores your answer
ch=str.charAt(0); // it takes that character you entered

}

while(ch=='y'); // if your answer is y then it again starts the process inside the do{} stuff
}
public static void salescalc(String title, double code, double price,double quantity) // method to calculate your total on basis of discount
{
double total,dsct;

//* Finding the Total*/
total = (price * quantity);
if (quantity >= 5 &&quantity <= 9)
{
dsct = (total * 12)/100 ;
}
else if (quantity >= 10 && quantity <= 14)
{
dsct = (total * 17)/100 ;
}
else if (quantity >= 15 )
{
dsct = (total * 25)/100 ;
}
else
{
dsct =0;
}
total = total - dsct;
System.out.println("TOTAL $" + total+"\n\n\n");
}

}

// the whole program is running on two methods one is the main() method which calls the salescalc method to calculate your discounted price of your DVD.

Answer 25

i have checked the above code its working and it asks you after every transaction if you want to continue or not

Answer 26

tuhinrawat90 What about the variables? they store all the sales? or just the last one?

Answer 27

they store the last one ,, do you want to store all the sales transaction

Answer 28

Yeah that's my question :)

Answer 29

Alright. The only difference between this program and what you want is this reads from a file instead of being user input.





//import decimal formatter
import java.text.DecimalFormat;

//import scanner object
import java.util.Scanner;

//import all file processing methods
import java.io.*;

public class prog4
{

public static void main(String[] args) throws IOException
{
final int DAR = 10; //constant size of array

int number[], //the sale order
count, //number of sales
C; //constant for data array

double sale[], //raw value of sale
tax[], //tax amount
net_sale[], //sale value plus tax
change[], // money returned to the customer
payment[], //money received from customer
total_tax, //total value of tax collected
total_net; //total value of net sales

String flag[]; //tax status of item sold

//create arrays of correct type with constant size
flag = new String[DAR];
number = new int[DAR];
sale = new double[DAR];
payment = new double[DAR];
tax = new double[DAR];
net_sale = new double[DAR];
change = new double[DAR];

Trans pos; //a trans object at pos

//create decimal format object
DecimalFormat formatter = new DecimalFormat("#0.00");

//create a scanner object for file input
File input = new File("NCR.data");

//open file for reading
Scanner NCR = new Scanner(input);

//populate arrays with info from file
count = 0;
while(NCR.hasNext())
{
flag[count] = NCR.next();
number[count] = NCR.nextInt();
sale[count] = NCR.nextDouble();
payment[count] = NCR.nextDouble();
count = count + 1;
}

//close the file
NCR.close();

//pass information to created class
pos = new Trans(count,flag,sale,payment);

//print heading function
PrintHeadings();

//calculatation methods from created class
pos.CalcTax(count,flag,sale,tax);
pos.CalcNetsale(count,tax,sale,net_sale);
pos.CalcChange(count,net_sale,payment,change);

//print the information to the screen
PrintTable(count,number,sale,tax,net_sale,change);

//print a line
PrintLine();

//calculate and print the total net sales and total tax
total_net = pos.CalcNet(count,net_sale);
System.out.println("TOTAL SALES: " + formatter.format(total_net));
total_tax = pos.CalcTaxt(count,tax);
System.out.println("TOTAL TAX: " + formatter.format(total_tax));
}

//print heading funtion
public static void PrintHeadings()
{
System.out.println(" POS CALC ALGORITHM TEST RUN");
PrintLine();
System.out.print("SALE# NET SALE SALES TAX");
System.out.println(" SALE TOTAL CHANGE");
PrintLine();
}

//This function prints the table data. Input parameters are the
//count, sale number, net sale, tax, sale total and change.
public static void PrintTable(int count, int number[], double sale[],
double tax[], double net_sale[], double change[])

{
int C; //loop control variable

for(C = 0; C < count; C++)
{
System.out.printf("%3d", number[C]);
System.out.printf("%13.2f", sale[C]);
System.out.printf("%11.2f", tax[C]);
System.out.printf("%14.2f", net_sale[C]);
System.out.printf("%12.2f\n", change[C]);
}
}

//This function prints a line
public static void PrintLine()
{
System.out.print("----------------------------");
System.out.println("---------------------------");
}
}

Answer 30

is there any limit to the number of transactions you want to store

Answer 31

//This class holds the pos information.
//It also calculates tax and net sale.

public class Trans
{
final int DAR = 10;

//set private variables of the class
private String[] status = new String[DAR];
private int[] num = new int[DAR];
private double[] value = new double[DAR];
private double[] receive = new double[DAR];

//constructor sets private variables to inital value
public Trans(int count)
{
int C; //loop control variable
for(C = 0; C < count; C++)
{
num[C] = 0;
value[C] = 0.0;
receive[C] = 0.0;
}
}

//constructor assigns the data from the main into
//class variables
public Trans(int count, String flag[], double sale[],
double payment[])
{
int C; //loop control variable

for(C = 0; C < count; C++)
{
status[C] = flag[C];
value[C] = sale[C];
receive[C] = payment[C];
}
}
// calculates the pos information, i.e. tax and net sales
public void CalcTax (int count, String flag[], double sale[],
double tax[])
{
int C; //loop control variable

for(C = 0; C < count; C++)
if (!status[C].equals ("N"))
{
tax[C] = value[C]*.09;
}
else
{
tax[C] = 0.0;
}
}
//this function calculates the net sale
public void CalcNetsale (int count, double tax[], double sale[],
double net_sale[])
{
int C; //loop control variable

for(C = 0; C < count; C++)

net_sale[C] = tax[C] + value[C];
}

//this function calculates the change returned
public void CalcChange (int count, double net_sale[], double payment[],
double change[])
{
int C; //loop control variable

for(C = 0; C < count; C++)

change[C] = receive[C]-net_sale[C];
}




//calculates the total net sales

public double CalcNet(int count, double net_sale[])
{
int C; //loop control variable
double tot_sale;

tot_sale = 0.0;

for(C = 0; C < count; C++)
tot_sale = tot_sale + net_sale[C];

return tot_sale;
}

//calculates the total of taxes collected

public double CalcTaxt(int count, double tax[])
{
int C; //loop control variable
double tot_tax;

tot_tax = 0.0;

for(C = 0; C < count; C++)
tot_tax = tot_tax + tax[C];

return tot_tax;
}
}

Answer 32

This is what you would need to change. At the top in the main, change Scanner NCR = new Scanner(input);

to

System.out.println("Enter 1. For new sale");
System.out.println("Enter 2. To quit");
Int NCR = new Scanner(keyboard);
while(NCR != 2){

Done.

Answer 33

This is a whole homework I did, with a little outline and method breakdown before the actual program:






A. Statement
To create a program for an internet provider which calculates each customers
bill based on their package, as well as the total of all the customer's bills.

B. Data Analysis
Name Type Content
package string the customer's chosen package
rate A real the rate of package A
rate B real the rate of package B
rate C real the rate of package C
hours A interger amount of hours in package A
hours B interger amount of hours in package B
hours C interger amount of hours in package C
hours interger the total amount of hours used
overage interger the amount over the plan the customer used
bill real the customers total bill
total real the company's total revenue collected

C. Problem Analysis

repeat until end command
get package
get hours
calculate customer bill
print customer bill
at end command
calculate total of customer's bills
print the results

D. Algorithm

function main()
total = 0
print "Select a package, (A,B,or C): "
get package
while package does not equal X
begin
print "Enter the number of hours used: "
get hours
bill = Calc(package,hours)
print "Internet Provided"
print "-----------------"
print " "
print "Package: ", package
print "Hours: ", hours
print " "
print "-----------------"
print " "
print "Bill: ", bill
print " "
total = total + bill
end
print "Total of all bills is $", total
Trace Table

count package rate hours overage charge bill
0 B 14.95 15 0 0 14.95
1 A 9.95 9 0 0 9.95
2 C 19.95 45 0 0 19.95

*/

//import decimal formatter
import java.text.DecimalFormat;

//import scanner object
import java.util.Scanner;

public class prog3
{

public static void main(String[] args)
{
int hours; //amount of hours used by the customer

double bill, //customer's bill amount
total; //total of all customer's bills

String mypackage; //customer's chosen package

Isp price; //calculation of price as Isp object

//create a scanner object for keyboard input
Scanner keyboard = new Scanner (System.in);


//create decimal format object
DecimalFormat formatter = new DecimalFormat ("00.00");

//set the total to zero
total = 0.00;

//get the customer's package
System.out.print("Select a package, (A,B, or C) (Press X to exit):");
mypackage = keyboard.next();

//set sentinel loop stop condition
while (mypackage != "X")
{

//get the customer's hours
System.out.print("Enter the number of hours used:");
hours = keyboard.nextInt();

//Create an Isp object
price = new Isp(mypackage,hours);

//calculate the bill
bill = price.CalcBill();

//print the results
System.out.println(" Internet Provided ");
System.out.println(" ----------------- ");
System.out.println(" Package " + mypackage);
System.out.println(" Hours " + hours);
System.out.println(" ----------------- ");
System.out.printf("\n Bill " + formatter.format (bill));
System.out.println();

//add to total
total = total + bill;

//continue the loop with next package
System.out.print("Select a package, (A,B, or C) (Press x to exit):");
mypackage = keyboard.next();

}
System.out.printf("\nTotal of all bills is $" + formatter.format (total));
}
}


/* Algorithm for Object

function CalcBill(package,hours)
package A rate = 9.95
package B rate = 14.95
package C rate = 19.95
package A hours = 10
package B hours = 20
get package
get hours
calculate the bill
if package = A
begin
then overage = hours - 10
if overage < 0
begin
overage = 0
end
bill = overage * 2 + package A rate
end
else if package = B
begin
then overage = hours - 20
if overage < 0
begin
overage = 0
end
bill = overage + package B rate
end
else
bill = package C rate
return bill to main
*/



public class Isp
{
// declare package rates as constants
public static final double PACKA = 9.95; //rate for package A
public static final double PACKB = 14.95; //rate for package B
public static final double PACKC = 19.95; //rate for package C

// declare package hours as constants
public static final int PHA = 10; //hours in package A
public static final int PHB = 20; //hours in package B

// class variables
private int cust_hours; //customer's hours used
private String cust_package; //customer's chosen package

// constructor will assign customer's hours and package
public Isp(String mypackage, int hours) //pass customer package and hours
{
cust_hours = hours; //convert hours for class
cust_package = mypackage; //convert package for class
}

// accessor for GetCusthour
public int GetCusthour()
{
return cust_hours;
}

// accessor for GetCustpack
public String GetCustpack()
{
return cust_package;
}

//calculates the customer's bill
public double CalcBill()
{
int overage; //set the amount of hours the customer goes over as int
double bill; //set the customer's bill as double

//set overage to zero
overage = 0;

//create formula for package A
if(cust_package.equals("A"))
{
overage = cust_hours - PHA;
if(overage <= 0)
{
overage = 0;
}

bill = (overage*2) + PACKA;

}
//create formula for package B
else if(cust_package.equals("B"))
{
overage = cust_hours - PHB;
if(overage <= 0)
{
overage = 0;
}
bill = overage + PACKB;
}
//create formula for package C
else
{
bill = PACKC;
}

return bill;
}

}

Answer 34

Thanks a lot again for you help man, I really appreciate! :D

Answer 35

No problem. Keep at it. I had never programmed in my life before about a year and a half ago. I'm still in school for it and interning working on this software framework that calculates "numerical relativity that relates to black hole modeling."