在 C# 中添加从 1 到 N 的数字 [英] Adding numbers from 1 to N in C#
问题描述
我正在用 C# 编写代码并尝试添加数字 1 和 N 之间的所有数字,N 是在文本框中输入的数字.我正在这样做,至少尝试这样做,将其放入 while 循环中.
I'm writing code in C# and trying to add all of the numbers between the number 1 and N, N being the number that is inputted in a textbox. I'm doing this, at least trying to do this, by putting it into a while loop.
我之前已经添加了 2 个文本框之间的所有数字,但由于某种原因,我快把自己逼疯了,无法弄清楚这一点.我是一个初级程序员,所以请温柔.
I have added all the numbers between 2 textboxes before but for some reason I'm driving myself crazy and can't figure this out. I'm a beginning programmer so please be gentle.
任何帮助将不胜感激.
我尝试过的六千件事之一.我认为这让我陷入无限循环?
One of the six thousand things I've tried. I think this has me in an infinite loop?
private void btnAddAll_Click(object sender, EventArgs e)
{
int n;
int count = 0;
int answer = 0;
n = int.Parse(txtNum.Text);
count = n;
while (count >= 1)
{
answer = answer + count;
count++;
}
lstShow.Items.Add("Sum = " + answer);
lstShow.Text = answer.ToString();
}
推荐答案
为什么不使用高斯公式.(N*(N+1))/2
Why not use Gauss formula. (N*(N+1))/2
private void btnAddAll_Click(object sender, EventArgs e)
{
int n, answer;
n = int.Parse(txtNum.Text);
answer = (n*(n+1))/2;
lstShow.Items.Add("Sum = " + answer);
lstShow.Text = answer.ToString();
}
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