求和平均值(网上找的，仅自用，非原创)

using System;
using System.Collections;
class Sum_Average
{
public static void Main()
{
int sum=0;
float average=0.0f;
Random r=new Random ();
ArrayList myArrayList=new ArrayList ();
Console.WriteLine ("你想算几个数的和,并求它的平均值:");
int iMax=int.Parse (Console.ReadLine ());
for(int i=0;i<iMax;i++)
{
myArrayList.Add (r.Next (0,100));
}
Console.WriteLine ("这{0}个数是:",iMax);
foreach(int pins in myArrayList)
{
Console.WriteLine (pins);
}
for(int j=0;j<iMax;j++)
{
sum+=(int)myArrayList[j];
}
Console.WriteLine ("这{0}个数的和是:{1}",iMax,sum);
average = (float)sum / iMax;
Console.WriteLine ("这{0}个数的平均值是:{1}",iMax,average);

}
}