이차방정식의 근의 공식
QuadraticFormulaForm.cs
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| using System; | |
| using System.Collections.Generic; | |
| using System.ComponentModel; | |
| using System.Data; | |
| using System.Drawing; | |
| using System.Linq; | |
| using System.Text; | |
| using System.Threading.Tasks; | |
| using System.Windows.Forms; | |
| namespace _14_QuadraticFormula | |
| { | |
| public partial class QuadraticFormulaForm : Form | |
| { | |
| //RootsOfQuadraticEquation() | |
| public void RootsOfQuadraticEquation(double a, double b, double c, | |
| out double dResult1, out double dResult2) | |
| { | |
| dResult1 = (-b + Math.Sqrt((b * b) - (4 * a * c))) / (2 * a); | |
| dResult2 = (-b - Math.Sqrt((b * b) - (4 * a * c))) / (2 * a); | |
| } | |
| public QuadraticFormulaForm() | |
| { | |
| InitializeComponent(); | |
| } | |
| private void btnOk_Click(object sender, EventArgs e) | |
| { | |
| //변수 선언 | |
| int a = int.Parse(txtA.Text); | |
| int b = int.Parse(txtB.Text); | |
| int c = int.Parse(txtC.Text); | |
| //이전 값 초기화 | |
| double dResult1, dResult2 = 0; | |
| lblResult.Text = ""; | |
| //RootsOfQuadraticEquation() 호출 | |
| RootsOfQuadraticEquation(a, b, c, out dResult1, out dResult2); | |
| //판별식에 따른 결과 출력 | |
| //D > 0 | |
| if ((b * b) - (4 * a * c) > 0) | |
| lblResult.Text = dResult1.ToString() + ", " + dResult2.ToString(); | |
| //D == 0 | |
| else if ((b * b) - (4 * a * c) == 0) | |
| lblResult.Text = dResult1.ToString(); | |
| //D < 0 | |
| else if ((b * b) - (4 * a * c) < 0) | |
| lblResult.Text = "허근"; | |
| } | |
| } | |
| } |
Windows Forms 앱으로 만듦
ax^2 + bx + c = 0에서
<name 속성>
a값을 입력받는 textbox: txtA
b값을 입력받는 textbox: txtB
c값을 입력받는 textbox: txtC
입력을 확인받아 실행하는 button: btnOk
결과(여기서는 해)를 출력하는 label: lblResult
댓글남기기