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我找不到我的數學錯誤在哪裏。我只是不明白爲什麼我繼續沒有收到我的determineCableSrvs方法的值。使用方法在Java中進行簡單計算
private static Scanner input = new Scanner(System.in); //STORES CUSTOMER NAME STRING VALUE
public static void main(String[] args)
{//BEGIN main()
//Variables
int subscription = 0; //STORES SUBSCRIPTION INTEGER VALUE
int moviesOnDemand = 0; //STORES MOVIES ON DEMAND INTEGER VALUE
double cableSrvs = 0; //STORES TOTAL CABLE SERVICE DECIMAL VALUE
double totalMovieCharges = 0; //STORES TOTAL MOVIE CHARGES DECIMAL VALUE
double total = 0; //STORES TOTAL DECIMAL VALUE
char confirm = 'Y'; //LOOP CONTROL VARIABLE SET TO Y
Calendar dateTime = Calendar.getInstance(); //STORES THE DATE VALUE
String customerName = "";
while(Character.toUpperCase(confirm) == 'Y') //START OF WHILE LOOP AUTOMATICALLY ENTERS
{
String customer = setCustNm(customerName);
double cable = setCablePkg(subscription);
double type = determineCableSrv(subscription, cableSrvs);
int movies = setMoviePurchase(moviesOnDemand);
totalMovieCharges = movies * 7; //CALCULATING THE TOTAL MOVIE ON DEMAND CHARGE
total = totalMovieCharges + type; //CALCULATING THE OVERALL TOTAL
System.out.printf("%n%s %tD"
+ "\nCustomer: %S"
+ "%n%nCable Service: $%,21.2f"
+ "%nMovies-On-Demand-HD: %,20.2f"
+ "\n\nTOTAL DUE: $%,21.2f\n",
"SA CABLE CHARGES AS OF", dateTime, customer, type,
totalMovieCharges, total);
input.nextLine();
askNewSubscription(confirm);
printThankYou(confirm);
}
}
public static String setCustNm(String customerName)
{
// 1st prompt
System.out.printf("%n%n%nWELCOME TO SA CABLE %n");
System.out.printf("%nPlease enter your name: "); //PROMPTING USER TO ENTER NAME
customerName = input.nextLine(); //CAPTURES USERS NAME
return customerName;
}
public static int setCablePkg(int subscription)
{
do{
// 2nd Prompt DISPLAYING THE DIFFERENT PACKAGES AVAILABLE FOR SUBSCRIPTION
System.out.printf("%nSA CABLE - SUBSCRIPTION PACKAGES " +
"%n%n1. Basic: Local & major TV network channels %s" +
"%n2. Deluxe: Local, major TV, cable & 100 other channels %s" +
"%n3. Premium: Deluxe package plus HEB, on-demand & 300 other channels %s",
"$35.00", "75.00", "110.00") ;
System.out.printf("%n%nSelect your cable subscription package: ");
subscription = input.nextInt();//CAPTURING USER INPUT
}while (subscription < 1 || subscription > 3);
return subscription;
}
public static double determineCableSrv(int subscription, double cableSrvs)
{
if(subscription == 1) // IF STATEMENT TO IDENTIFY THE PRICE OF THE TOTAL CABLE SERVICE
{
cableSrvs = 35;
}
else if(subscription == 2)
{
cableSrvs = 75;
}
else if(subscription == 3)
{
cableSrvs = 110;
}
return cableSrvs;
}
public static int setMoviePurchase(int moviesOnDemand)
{
System.out.printf("%nSA CABLE - MOVIES " +
"%n%nEnter the number of Movies-On-Demand-HD purchases: ");
moviesOnDemand = input.nextInt();
return moviesOnDemand;
}
public static char askNewSubscription(char confirm)
{
System.out.printf("\nEnter 'Y' to continue with a new subscription or 'N' to exit: ");
confirm = input.nextLine().charAt(0);
return confirm;
}
public static char printThankYou(char confirm)
{
if(Character.toUpperCase(confirm) == 'Y')
{
confirm = 'Y';
}
if (Character.toUpperCase(confirm) != 'Y')
{
confirm = 'N';
System.out.printf("Thank you for being a valued SA Cable customer!");
System.exit(0);
}
return confirm;
}
我在與這部分的麻煩：
public static double determineCableSrv(int subscription, double cableSrvs)
{
if(subscription == 1) // IF STATEMENT TO IDENTIFY THE PRICE OF THE TOTAL CABLE SERVICE
{
cableSrvs = 35;
}
else if(subscription == 2)
{
cableSrvs = 75;
}
else if(subscription == 3)
{
cableSrvs = 110;
}
return cableSrvs;
}
這裏是我如何調用該方法：
double type = determineCableSrv(subscription, cableSrvs);
我似乎無法得到的返回值。我需要的值：
total = totalMovieCharges + type; //CALCULATING THE OVERALL TOTAL
這種打印出來聲明：
System.out.printf("%n%s %tD"
+ "\nCustomer: %S"
+ "%n%nCable Service: $%,21.2f"
+ "%nMovies-On-Demand-HD: %,20.2f"
+ "\n\nTOTAL DUE: $%,21.2f\n",
"SA CABLE CHARGES AS OF", dateTime, customer, type,
totalMovieCharges, total);