import java.util.*;
class Averager
{
public static double unlimited()
{
int count = 0;
double sum = 0;
Scanner scan = new Scanner(System.in);
while(scan.hasNext())
{
double d = scan.nextDouble();
sum += d;
count++;
}
double ave = sum/count;
return ave;
}
public static void main(String[] args) {
System.out.println(unlimited()+"\n");
}
}
$javac Averager.java; java Averager
0.5
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:840)
at java.util.Scanner.next(Scanner.java:1461)
at java.util.Scanner.nextDouble(Scanner.java:2387)
at Averager.unlimited(Averager.java:12)
at Averager.main(Averager.java:21)
据我所知,0.5应该用双倍覆盖.如果不是,请有人纠正我.
解决方法
它可能依赖于语言环境.在瑞典,十进制数字例如写为0.5.
改变你的代码,以便例如：
Scanner scan = new Scanner(System.in); scan.useLocale(Locale.US);
