跪求大神！程序改错
改错，
private void btnRun_Click(object sender, EventArgs e)
{
int a = 20, b = 30, c = 45;
int sum = 0;
double average = 0;

GetSumAndAverage(a, b, c, sum, average);

Output(String.Format("和是：{0}, 平均值是：{1}",sum,average));
}

private static void GetSumAndAverage(int a, int b, int c, int sum, double aver)
{
sum = a + b + c;
aver = (a + b + c) / 3.0;
} 我是纯来蹭分的 嘻嘻