能写个大概的代码看看嘛?或看看我的
private void button1_Click(object sender, System.EventArgs e)
{
int iji=Convert.ToInt32(textBox1.Text);
int iyf=Convert.ToInt32(textBox2.Text);
int sum1=iji;
//string sum=iji.ToString();
while (iyf>0)
{
iyf=iyf-3;
if (iyf<0)
break;
iji=iyf;
sum1=sum1+iji;