我是新來的swift,我試圖做一個簡單的應用程序,解決方程(線性或二次方)。用戶必須輸入a,b,c的值(公式爲:ax^2 + bx + c = 0),並且如果a = 0,應用程序解決線性方程,如果a = 0,應用程序解決了二次方程(或者說它沒有解決方案)。斯威夫特 - 二次方程求解器給出了錯誤的結果?
問題是..線性方程組部分工作得很好,並給出了正確的結果,但該應用程序給出了二次方程的錯誤結果! 例如,如果a = 4,b = 12,c = 8,結果應該是x1 = -1,x2 = -2,但我在這裏得到的解決方案是x1 = -16.0,x2 = -32.0
X1/X2似乎是正確的(0.5),但結果是完全錯誤的
這是我寫的
import UIKit
import Foundation
class ViewController: UIViewController {
@IBOutlet weak var EnterA: UITextField!
@IBOutlet weak var EnterB: UITextField!
@IBOutlet weak var EnterC: UITextField!
@IBOutlet weak var LabelYourEquation: UILabel! // gonna deal with this later
@IBOutlet weak var Button: UIButton!
@IBOutlet weak var LabelX1: UILabel!
@IBOutlet weak var LabelX2: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
Hide()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
var a = Double()
var b = Double()
var c = Double()
var delta = Double()
var x1 = Double()
var x2 = Double()
var linearEquation = Bool()
var quadraticEquation = Bool()
func checkEquation() {
if a == 0 {
linearEquation = true
quadraticEquation = false
} else if a != 0 {
quadraticEquation = true
linearEquation = false
}
}
func linearEquationResolution() -> Double {
x1 = -c/b
LabelX2.hidden = true
LabelX1.text = "x = \(x1)"
return x1
}
func Delta() -> Double {
delta = (b * b) - (4 * a * c)
return delta
}
func quadraticEquationResolution() {
if delta >= 0 {
x1 = (-b + sqrt(delta))/2*a
x2 = (-b - sqrt(delta))/2*a
LabelX1.hidden = false
LabelX2.hidden = false
LabelX1.text = "x1 = \(x1)"
LabelX2.text = "x2 = \(x2)"
} else if delta < 0 {
LabelX1.text = "The equation has no solution"
LabelX2.hidden = true
}
}
func solveIt() {
if linearEquation == true {
linearEquationResolution()
} else if quadraticEquation == true {
Delta()
quadraticEquationResolution()
}
}
func Hide() {
LabelX2.hidden = true
LabelX1.hidden = true
}
@IBAction func SolveItAction(sender: AnyObject) {
a = Double(EnterA.text!)!
b = Double(EnterB.text!)!
c = Double(EnterC.text!)!
checkEquation()
solveIt()
}
}
任何想法的代碼?我做錯了什麼?
對於未來的問題,修剪下來的代碼爲[MCVE。這個例子的最好方法就是刪除gui,並硬編碼不起作用的值。事實上,如果你已經完成了這一步並自己完成了計算,那麼你會發現一行代碼是錯誤的,並且可能發現了你的錯誤。 – Teepeemm