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利用迴圈語法 for, while 及 do while 輸出等差數列及其和

Junter.wjs STUST MIS 丙 4A990025

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(s字串) 寫在外層 Form

public partial class Form1 : Form { string s;

for 迴圈

private void button1_Click(object sender, EventArgs e) { int start, max, step, i, sum = 0; start = Convert.ToInt32(textBox1.Text); max = Convert.ToInt32(textBox2.Text); step = Convert.ToInt32(textBox3.Text); label8.Text = ""; s = "數列為:"; if (step < 0) { if (start < max) { MessageBox.Show("由小到大,等差須為正值", "錯誤!", MessageBoxButtons.OK, MessageBoxIcon.Error); textBox1.Text = ""; textBox2.Text = ""; textBox3.Text = ""; } else { for (i = start; i >= max; i += step) { sum -= i; s += i + " "; } s += "\n" + "總和為:" + Math.Abs(sum); label8.Text = s; } } else { if (start > max) { MessageBox.Show("由大到小,等差須為負值", "錯誤!", MessageBoxButtons.OK, MessageBoxIcon.Error); textBox1.Text = ""; textBox2.Text = ""; textBox3.Text = ""; } else { for (i = start; i <= max; i += step) { sum += i; s += i + " "; } s += "\n" + "總和為:" + Math.Abs(sum); label8.Text = s; } } }

dowhile 迴圈

private void button2_Click(object sender, EventArgs e) { int start, max, step, sum = 0; start = Convert.ToInt32(textBox1.Text); max = Convert.ToInt32(textBox2.Text); step = Convert.ToInt32(textBox3.Text); label8.Text = ""; s = "數列為:"; if (step < 0) { if (start < max) { MessageBox.Show("由小到大,等差須為正值", "錯誤!", MessageBoxButtons.OK, MessageBoxIcon.Error); textBox1.Text = ""; textBox2.Text = ""; textBox3.Text = ""; } else { do { sum += start; s += start + " "; start += step; } while (start >= max); s += "\n" + "總和為:" + Math.Abs(sum); label8.Text = s; } } else { if (start > max) { MessageBox.Show("由大到小,等差須為負值", "錯誤!", MessageBoxButtons.OK, MessageBoxIcon.Error); textBox1.Text = ""; textBox2.Text = ""; textBox3.Text = ""; } else { do { sum += start; s += start + " "; start += step; } while (start <= max); s += "\n" + "總和為:" + Math.Abs(sum); label8.Text = s; } } }

While 迴圈

private void button3_Click(object sender, EventArgs e) { int start, max, step, sum = 0; start = Convert.ToInt32(textBox1.Text); max = Convert.ToInt32(textBox2.Text); step = Convert.ToInt32(textBox3.Text); label8.Text = ""; s = "數列為:"; if (step < 0) { if (start < max) { MessageBox.Show("由小到大,等差須為正值", "錯誤!", MessageBoxButtons.OK, MessageBoxIcon.Error); textBox1.Text = ""; textBox2.Text = ""; textBox3.Text = ""; } else { while (start >= max) { sum += start; s += start + " "; start += step; } s += "\n" + "總和為:" + Math.Abs(sum); label8.Text = s; } } else { if (start > max) { MessageBox.Show("由大到小,等差須為負值", "錯誤!", MessageBoxButtons.OK, MessageBoxIcon.Error); textBox1.Text = ""; textBox2.Text = ""; textBox3.Text = ""; } else { while (start <= max) { sum += start; s += start + " "; start += step; } s += "\n" + "總和為:" + Math.Abs(sum); label8.Text = s; } } }
【資歷】王俊勝待更新

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last
update:2021/3/12

 

程式碼如有錯誤!請自行修正。

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Tags: C# For do..while while Loop 迴圈

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