using System;

public class Test
{
	public struct AItem{
		public Int32 A{get;set;}
	}
	
	public static void Main()
	{
		AItem[] arr=new AItem[] { new AItem(){A=2},new AItem(){A=3},new AItem(){A=4}};
		for(Int32 i=0;i<arr.Length;i++)
			{
				It(arr[i]);
				arr[i].A=arr[i].A-1;
				Console.WriteLine("A[{0}]={1}",i,arr[i].A);
			}
	}
	
	static void It(AItem item){
		item.A=item.A+1;
	}
}