我不斷收到 Exception in thread "main" java.util.NoSuchElementException 錯誤消息。我已經嘗試過更換東西，但我仍然遇到這個問題我嘗試過用不同的方法聲明變量，但似乎沒有任何效果。import java.util.Scanner;public class LabProgram { public static double drivingCost(double drivenMiles, double milesPerGallon, double dollarsPerGallon) { double totalCost = (drivenMiles / milesPerGallon) * dollarsPerGallon; return totalCost; } public static void main(String[] args) { double milesG; double dollarsG; Scanner scnr = new Scanner(System.in); milesG = scnr.nextDouble(); dollarsG = scnr.nextDouble(); drivingCost(10.0, milesG, dollarsG); milesG = scnr.nextDouble(); dollarsG = scnr.nextDouble(); drivingCost(50.0, milesG, dollarsG); milesG = scnr.nextDouble(); dollarsG = scnr.nextDouble(); drivingCost(400.0, milesG, dollarsG); }}問題是：使用輸入參數drivenMiles、milesPerGallon 和dollarsPerGallon 編寫一個driveCost() 方法，該方法返回駕駛這些里程的美元成本。所有項目都是 double 類型。如果使用 50 20.0 3.1599 調用該方法，則該方法返回 7.89975。在程序中定義該方法，其輸入是汽車的英里/加侖和汽油美元/加侖（均為雙倍）。通過調用 DrivingCost() 方法 3 次，輸出 10 英里、50 英里和 400 英里的汽油成本。輸出每個浮點值，小數點后兩位。輸入為：20.0 3.1599預期產量：1.58 7.90 63.20
4 回答
阿波羅的戰車
TA貢獻1862條經驗 獲得超6個贊
import java.util.Scanner;
public class LabProgram {
/* Define your method here */
public static double drivingCost(double drivenMiles, double milesPerGallon, double dollarsPerGallon) {
double totalCost = (dollarsPerGallon * drivenMiles / milesPerGallon);
return totalCost;
}
public static void main(String[] args) {
/* Type your code here. */
Scanner scnr = new Scanner(System.in);
double milesPerGallon = scnr.nextDouble();
double dollarsPerGallon = scnr.nextDouble();
double drivenMiles = 1;
System.out.printf("%.2f ", drivingCost(drivenMiles, milesPerGallon, dollarsPerGallon) * 10);
System.out.printf("%.2f ", drivingCost(drivenMiles, milesPerGallon, dollarsPerGallon) * 50);
System.out.printf("%.2f\n", drivingCost(drivenMiles, milesPerGallon, dollarsPerGallon) * 400);
}
}
大話西游666
TA貢獻1817條經驗 獲得超14個贊
driveMiles 除以每加侖英里數，然后乘以每加侖美元，即可得出每英里行駛的汽油價格。注意：在這種情況下，drivenMiles 只需要傳遞給 movingCost。這就是為什么要添加整數 10、50 和 400 來調用。
由于 DrivingCost 按此順序具有milesPerGallon、dollarsPerGallon 和drivenMiles 參數，因此您必須使用相同的參數順序調用該方法。
“%.2f”將得到右邊兩位小數。添加 \n 后將另起一行。
import java.util.Scanner;
public class LabProgram {
public static double drivingCost(double milesPerGallon, double dollarsPerGallon, double drivenMiles) {
// calcuating the cost of gas
double totalCost = (drivenMiles / milesPerGallon) * dollarsPerGallon;
return totalCost;
}
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
double milesPerGallon;
double dollarsPerGallon;
milesPerGallon = scnr.nextDouble();
dollarsPerGallon = scnr.nextDouble();
// order of the call to the method is important, printing cost of gas for 10, 50, and 400 miles
System.out.printf("%.2f ",drivingCost(milesPerGallon, dollarsPerGallon, 10));
System.out.printf("%.2f ",drivingCost(milesPerGallon, dollarsPerGallon, 50));
System.out.printf("%.2f\n",drivingCost(milesPerGallon, dollarsPerGallon, 400));
}
}
森林海
TA貢獻2011條經驗 獲得超2個贊
import java.util.Scanner;
public class LabProgram {
public static double drivingCost(double milesPerGallon, double dollarsPerGallon, double drivenMiles) {
return (drivenMiles / milesPerGallon) * dollarsPerGallon;
}
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
double milesPerGallon, dollarsPerGallon;
milesPerGallon = input.nextDouble();
dollarsPerGallon = input.nextDouble();
System.out.printf("%.2f ", drivingCost(milesPerGallon, dollarsPerGallon, 10));
System.out.printf("%.2f ", drivingCost(milesPerGallon, dollarsPerGallon, 50));
System.out.printf("%.2f\n", drivingCost(milesPerGallon, dollarsPerGallon, 400));
}
}
蠱毒傳說
TA貢獻1895條經驗 獲得超3個贊
您在主函數中調用了scnr.nextDouble();六次。確保在運行程序時提供六個double類型的參數。目前，您傳遞的參數少于六個，并且scnr.nextDouble();拋出異常，因為它找不到下一個 double 類型的參數。
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