Calculator

Calculator is an iOS application that does the job of a normal calculator.

✨Application Features

It is a simple iOS app built by Swift, which can perform simple mathematical equations involving adding, subtracting multiplying and dividing.
The app takes in account operations priority when performing calculations.
More to be done.

Code Samples

@IBAction func divisionClicked(_ sender: Any) {
        if result.text != "" {
            rslt += "/"
        }
    }
    
    @IBAction func multplyClicked(_ sender: Any) {
        if result.text != "" {
            rslt += "*"
        }
    }
    
    @IBAction func subClicked(_ sender: Any) {
        if result.text == "0" {
            
        }else if !rslt.hasSuffix("+") || !rslt.hasSuffix("-") || !rslt.hasSuffix("*") || !rslt.hasSuffix("/"){
            let expression = NSExpression(format:rslt)
            if let total = expression.expressionValue(with: nil, context: nil) as? Double {
                result.text = IntFormat(total: total)
                rslt += "-"
            }
        }
    }
    
    @IBAction func addClicked(_ sender: Any) {
        if result.text == "0" {
            
        }else if rslt.hasSuffix("+"){
            let lastOperator = String(rslt.last!)
            rslt.removeLast()
            rslt.removeLast()
            rslt += lastOperator
            
        }else if !rslt.hasSuffix("+") || !rslt.hasSuffix("-") || !rslt.hasSuffix("*") || !rslt.hasSuffix("/"){
            let expression = NSExpression(format:rslt)
            if let total = expression.expressionValue(with: nil, context: nil) as? Double {
                result.text = IntFormat(total: total)
                rslt += "+"
            }
        }
    }
    
    @IBAction func equalClicked(_ sender: Any) {
        let expression = NSExpression(format: rslt)
        print(expression)
        if let total = expression.expressionValue(with: nil, context: nil) as? Double{
            result.text = IntFormat(total: total)
        }
    }
    
    @IBAction func acClicked(_ sender: Any) {
        result.text = "0"
        rslt = "1.0*"
    }
    
    func IntFormat(total : Double) -> String {
        if total.truncatingRemainder(dividingBy: 1) == 0{
            return String(format: "%.0f", total)
        }else{
            return String(total)
        }
    }
    
    func numberClicked(_ numberPressed: String){
        if result.text?.count == 1 && result.text == "0" {
            result.text = numberPressed
            rslt += numberPressed
        }else if rslt.hasSuffix("+") || rslt.hasSuffix("-") || rslt.hasSuffix("*") || rslt.hasSuffix("/"){
            result.text = numberPressed
            rslt += numberPressed
        }else{
            result.text! += numberPressed
            rslt += numberPressed
        }
    }

Demos

demo2.mp4

GitHub

View Github