我正在學習書籍「Java,如何編程」練習。我應該編寫一個程序,以英里爲單位驅動用戶類型,並使用公升汽油用於未確定的行程次數。錯誤消息:「標識符預計」
該程序應該打印每英里每公升的旅程,並在最後平均英里公升。
我應該使用定點控制的重複,並打印英里公升作爲浮點值。
總是收到的錯誤消息時,我試圖編譯:
GasolineUsage.java:39:預期 milPrLiter =(雙)totalMil/totalLiters; (「The car drives%.2f miles pr liter gasoline \ n \ n」,milPrLiter);以及其中,
^ GasolineUsage.java:40: 類型System.out.printf的非法啓動 ( 「汽車驅動%.2f英里PR升 汽油\ n \ n」 個,milPrLiter);
^ GasolineUsage.java:40: expected System.out.printf(「The car drives%.2f miles pr liter gasoline \ n \ n」,milPrLiter);^GasolineUsage.java:42:類,接口,或枚舉預期}^5個 錯誤
的代碼如下:
import java.util.Scanner;
public class GasolineUsage
{
public static void main(String[] args)
{
int totalMil = 0;
int totalLiters = 0;
double milPrLiter1 = 0;
double milPrLiter;
Scanner inputMil = new Scanner(System.in);
Scanner inputLiters = new Scanner(System.in);
System.out.print("Type in miles first trip, to end type: -1 ");
int mil = inputMil.nextInt();
System.out.print("Type in liters of gasoline used on first trip ");
int liters = inputLiters.nextInt();
totalMil = totalMil + mil;
totalLiters = totalLiters + liters;
milPrLiter1 = (double) mil/liters;
System.out.printf("(%.2f miles pr liter this trip.)\n", milPrLiter1);
System.out.print("Type in miles on next trip ");
while (mil != -1)
{
mil = inputMil.nextInt();
if (mil != -1)
{totalMil = totalMil+ mil;
System.out.print("Type in lters used on next trip: ");
liters = inputLiters.nextInt();}
totalLiters = totalLiters + liters;
milPrLiter1 = (double) mil/liters;
System.out.printf("(%.2f miles pr liter this trip.)\n", milPrLiter1);}
}
milPrLiter = (double) totalMil/totalLiters;
System.out.printf("The car drives %.2f miles pr liter gasoline\n\n", milPrLiter);
}
}
任何人都可以幫我嗎?