Binary operator '*' cannot be applied to operands of type 'Double' and 'Int'

Question

I tried some solutions on this website but could not come up with one.

I keep getting this error with this line of code:

func futureValue() {
    let interest = Double(interestInput.text!) ?? 0
    let pv = Double(pvInput.text!) ?? 0
    let years = Double(yearsInput.text!) ?? 0
        
    let result = pv * (1.0 + interest) ^^ years
}

The result variable is where I receive the error. What am I doing wrong?

Answer 1

To answer this question, the custom ^^ operator was set for Int and not Double.

This is incorrect:

}

precedencegroup PowerPrecedence { higherThan: MultiplicationPrecedence }
infix operator ^^ : PowerPrecedence
func ^^ (radix: Int, power: Int) -> Int {
    return Int(pow(Double(radix), Double(power)))

This is the correct way, to match the Double in the futureValue() function:

}

precedencegroup PowerPrecedence { higherThan: MultiplicationPrecedence }
infix operator ^^ : PowerPrecedence
func ^^ (radix: Double, power: Double) -> Double {
    return Double(pow(Double(radix), Double(power)))
}