/*This is a program that calculates Internet advertising rates based on what features/options you choose.
*
*
*/
import java.util.Scanner;
public class InternetAdvertising
{
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int numberOfWords;
//I assigned 0 values to both as Eclipse suggested
float textCost = 0;
float linkCost = 0;
float graphicCost;
//<=25 words is a flat fee of $.40 per word plus Base fee of $3.00
final float TEXT_FLAT_FEE = 0.40F;
final float TEXT_BASE_FEE = 3.00F;
//<=35 words is $.40 for the first 25 words and
//an additional $.35 per word up to and including 35 words plus Base fee of $3.00
final float LESS_OR_EQUAL_THAN_THIRTYFIVE = 0.35F;
//Over 35 words is a flat fee of $.32 per word with no base fee
final float MORE_THAN_THIRTYFIVE = 0.32F;
System.out.println("Welcome!");
System.out.print("Enter the number of words in your ad: ");
numberOfWords = in.nextInt();
if (numberOfWords <= 25)
{
textCost = TEXT_BASE_FEE + (TEXT_FLAT_FEE * numberOfWords);
}
else if (numberOfWords <= 35)
{
textCost = TEXT_BASE_FEE + (TEXT_FLAT_FEE * 25) + (numberOfWords - 25) * LESS_OR_EQUAL_THAN_THIRTYFIVE;
}
else if (numberOfWords > 35)
{
textCost = numberOfWords * MORE_THAN_THIRTYFIVE;
}
String addLink, advancePay;
char link, advPay;
final float LINK_FLAT_FEE = 14.95F;
final float THREE_MONTH_ADV_DISCOUNT = 0.10F;
System.out.print("Would you like to add a link (y = yes or n = no)? ");
addLink = in.next();
link = addLink.charAt(0);
link = Character.toLowerCase(link);
if (link == 'y')
{
System.out.print("Would you like to pay 3 months in advance " + "(y = yes or n = no)? ");
advancePay = in.next();
advPay = advancePay.charAt(0);
advPay = Character.toLowerCase(advPay);
switch (advPay)
{
case 'y':
linkCost = (3 * LINK_FLAT_FEE) - (3 * LINK_FLAT_FEE) * THREE_MONTH_ADV_DISCOUNT;
break;
case 'n':
linkCost = LINK_FLAT_FEE;
break;
}
}
else
{
linkCost = 0;
}
String addGraphic;
char graphic;
System.out.print("Would you like to add graphics/pictures” + “(S = Small, M = Medium, L = Large or N = None)? ");
addGraphic = in.next();
graphic = addGraphic.charAt(0);
graphic = Character.toUpperCase(graphic);
graphic = Character.toLowerCase(graphic);
switch (graphic)
{
case 's':
graphicCost = 19.07F;
break;
case 'm':
graphicCost = 24.76F;
break;
case 'l':
graphicCost = 29.33F;
break;
default:
graphicCost = 0;
}
float gst, totalBeforeGst, totalAfterGst;
final float GST_RATE = 0.05F;
totalBeforeGst = textCost + linkCost + graphicCost; //textCost & linkCost would not initialize
gst = totalBeforeGst * GST_RATE;
totalAfterGst = totalBeforeGst + (totalBeforeGst * GST_RATE);
System.out.printf("\t\t%-16s %11s\n", "Category", "Cost");
System.out.printf("\t\t%-16s %11.2f\n", "Text", textCost); //linkCost would not initialize
System.out.printf("\t\t%-16s %11.2f\n", "Link", linkCost); //textCost would not initialize
System.out.printf("\t\t%-16s %11.2f\n", "Graphic", graphicCost);
System.out.printf("\t\t%-16s %11.2f\n", "Total", totalBeforeGst);
System.out.printf("\t\t%-16s %11.2f\n", "GST", gst);
System.out.printf("\t\t%-16s %11.2f\n", "Total with GST", totalAfterGst);
}
}
Już prawie skończyłem z tym kodem i Eclipse sugeruje przypisanie wartości 0 do textCost i linkCost. Czy jest jakiś inny sposób na obejście tego problemu. Jeśli nie przypiszę wartości 0, pojawi się błąd (zmienna lokalna XXX mogła nie zostać zainicjowana). Czy ktoś może mi wyjaśnić, dlaczego tak się dzieje, mimo że mam przypisane równania obu zmiennym?
Dzięki.
EDYCJA: Zrobiłem zgodnie z sugestią i zadeklarowałem zmienne tylko wtedy, gdy będę ich potrzebować. Dodałem także kilka komentarzy.
