Unary operator '--' cannot be applied to an operand of type '@lvalue Int'

Question

@IBAction func blueBtnAct(_ sender: AnyObject) {
    score++  //error bcause Unary operator '++' cannot be applied to an operand of type '@lvalue Int'
    blueLbl.text = "\(score)"
    GrenLbl.text = "\(score)"
    testScore()
}
@IBAction func GrenBtnAct(_ sender: AnyObject) {
    score--  //error bcause Unary operator '--' cannot be applied to an operand of type '@lvalue Int'
    blueLbl.text = "\(score)"
    GrenLbl.text = "\(score)"
    testScore()
}

score 6 · Accepted Answer · answered Oct 20 '17 at 09:42

6

You should use use score = score + 1 instead of score++

answered Oct 20 '17 at 09:42

Zee

327
1
8

5

The recommended replacement is `score += 1` – vadian Oct 20 '17 at 10:16
yes you are right @vadian but score = score + 1 easy for learning purpose – Zee Oct 20 '17 at 10:21
No, learn the right stuff. Who is able to understand `++` will understand `+= 1`, too ;-) – vadian Oct 20 '17 at 10:24
okay sir you right! – Zee Oct 20 '17 at 10:26

Unary operator '--' cannot be applied to an operand of type '@lvalue Int'

1 Answers1