简单的问题

Question

public static void main (String[] args)

Answer 1

{for (double i=0.0;i<arr.length ;i++ )
这里不用doulbe,用int

Answer 2

class Avg2 {
static double avg(double[] arr){
double sum=0.0;
if (arr.length>0)
{for (double i=0.0;i<arr.length ;i++ )  //不要用double，有精
                                                          //度损失，编译过不了
sum + =arr[i];                 //“+”和“=”之间不要
                                                          //有空格
sum /=arr.length;
}
return sum;
}
static int avg (int[] arr) {
int sum=0;
if (arr.length>0)
{for(int i=0;i<arr.length;i ++)
sum +=arr[i];
sum /=arr.length;
}
return sum;
}public static void main (string[] args)                   //少了“{”
int[] intArray ={1,2,3,4,5};
    double[] doubleArray ={10,20,30,40,50};
System.out.println (avg(intArray));
System.out.println (avg(doubleArray));
}
}---------------------------------------------------------------------------------
改过来试试吧，顺便提一句，你的写做格式要注意工整了，我看了很久才看懂                '''             
               (0 0)            
   +-----oOO----(_)------------+
   |                           |
   |         有感而发！         |
   |                           |
   |                           |
   +------------------oOO------+
              |__|__|           
               || ||            
              ooO Ooo