ios - Missing return in a function - swift error in Model -

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so have self generated pie chart on storyboard various labels, sliders, buttons of age, currentasset, income, etc. i'm building model struct , keep getting errors several methods have "missing return in function expected return 'double'" though can see have returns currentassetfactor, savingsfactor, bondfactor, tolerancefactor, outlookfactor. doing wrong?

public struct allocationmodel {   let maxage = 95.0   let currentage: double    let mincurrentasset = 100000.0   let maxcurrentasset = 500000.0   let currentasset: double    let minsavings = 5000.0   let maxsavings = 20000.0   let currentsavings: double    let maxincomerequired = 0.04   let minincomerequired = 0.01   let currentincomerequired: double    let tolerance: string    let outlook: string    // mark: - methods    public var currentassetfactor: double {     if currentasset > maxcurrentasset {       return 5.0     } else if currentasset >= mincurrentasset {       return double(currentasset / mincurrentasset)     }   }    public var savingsfactor: double {     if currentsavings >= maxsavings {       return 4.0     } else if currentsavings >= minsavings {       return double(currentsavings / minsavings)     }   }    public var bondfactor: double {     if currentincomerequired >= maxincomerequired {       return 0.2     } else if currentincomerequired >= minincomerequired {       return (0.05 * double(currentincomerequired / minincomerequired) )     }   }    public var tolerancefactor: double {     switch tolerance {       case "conservative": return 0.0       case "balanced": return 3.0       case "aggressive": return 6.0     default: 0.0     }   }    public var outlookfactor: double {     switch outlook {       case "poor": return 0.0       case "moderate": return 7.0       case "strong": return 10.0     default: return 0.0     }   }     public var stock: double {     return maxage - currentage + currentassetfactor + savingsfactor + tolerancefactor + outlookfactor   }    public var nonstock: double { return 100.0 - stock }    public var bondpercentage: double { return 0.35 + bondfactor }    public var bond: double { return nonstock * bondpercentage }    public var cash: double { return nonstock - bond }    // mark: - init    public init(currentage: double, currentasset: double, currentsavings: double, currentincomerequired: double, tolerance: string, outlook: string) {     assert(currentage > 0)      self.currentage = currentage     self.currentasset = currentasset     self.currentsavings = currentsavings     self.currentincomerequired = currentincomerequired     self.tolerance = tolerance     self.outlook = outlook   }  }

you not covering every case. consider 1 of methods:

  public var currentassetfactor: double {     if currentasset > maxcurrentasset {       return 5.0     } else if currentasset >= mincurrentasset {       return double(currentasset / mincurrentasset)     }   }

fine. if first if fails (e.g. currentasset not greater maxcurrentasset) , second if fails (e.g. currentasset not greater or equal mincurrentasset)? don't return anything!

so there's hole in logic. , compiler smart - smarter are! so smart spots hole in logic, , stops in tracks. need rewrite methods in such way prove compiler every possibility covered, i.e. always return value, no matter what.


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