JAVA 功課

silzai

1. int num;
   
2. final int MAX = 5;
   
3. double price1, price2, price3, price4, price5;
   
4. String descript;
   
5. String another =  "y";
   
6.                        
   
7. while (another.equalsIgnoreCase("y"))
   
8. {
   
9.                        
   
10. System.out.println("Starting new customer...");
    
11. System.out.print("How many items are being purchased: ");
    
12. num = sc.nextInt();
    
13.                        
    
14. 
    
15. while (num > MAX || num <=0)
    
16. {
    
17. System.out.println("Invalid input. Please enter again.");
    
18. System.out.print("How many items are being purchased: ");
    
19. num = sc.nextInt();
    
20. }
    
21.                                
    
22. if (num > 0 && num <= MAX)
    
23. {
    
24. int count = 1;
    
25. do
    
26. {
    
27.                                        
    
28. System.out.print("Enter description of product #" + count + ": ");
    
29. descript = sc.next();
    
30.                                
    
31. System.out.print("Enter price of "+ descript +": ");
    
32. price1 = sc.nextDouble();                       
    
33. 
    
34. count++;
    
35. }
    
36. while (count <= num);
    
37.                                
    
38. double total = price1;                       
    
39.                                
    
40. System.out.println("\n-------------------------------");
    
41. System.out.println("        The Greengrocery");
    
42. System.out.println("        Transaction: " + num + "");
    
43. System.out.println("        Total Amount Due: $" + total + "");
    
44. System.out.println("-------------------------------");
    
45. }

複製代碼

要計個total price出黎 (例如5件貨就要計5件既total price)
但係我每次loop都會overwrite左個price1
點算?

[ 本帖最後由 silzai 於 2008-11-25 20:14 編輯 ]

DarkHero

price1 = price1 + sc.nextDouble();

[ 本帖最後由 DarkHero 於 2008-11-25 21:47 編輯 ]

astray

將呢 part

System.out.print("Enter price of "+ descript +": ");
price1 = sc.nextDouble();     

改成

System.out.print("Enter price of "+ descript +": ");
price1 += sc.nextDouble();     

仲有 declare price1 時變成 double price1 = 0d;

快靚正

silzai

原帖由 astray 於 2008-11-25 21:48 發表
仲有 declare price1 時變成 double price1 = 0d;

唔該曬

[ 本帖最後由 silzai 於 2008-11-25 22:57 編輯 ]