public class AddIndexedNumbers 
{
    public static void main(String args[])
    {
	    int data[];  // 配列の宣言
	    data = new int[10]; // 配列の作成
	    
	    System.out.println("Array size = " + data.length);  // 配列の大きさ
	    
	    // データの配列への代入
	    data[0] = 8; data[1] = -9; data[2] = 13; data[3] = 4; data[4] = -23;
	    data[0] = -12; data[1] = 4; data[2] = 3; data[3] = 18; data[4] = 12;	    
        int i, n, sum;
		sum = 0;  // sum の初期化
		n = 10; // 
		
		for ( i=0; i<n; ++i ) sum += data[i];  // 合計
		System.out.println("sum = " + sum );
		System.out.println("average = " + (float) sum / (float) n);  // 平均
    }
}