Why I can't increment in scala?

Question

 def guessing_game():Unit = { println("Welcome to the guessing game!!") val guess_count:Int = 0 val answer = Random.nextInt(50) var guess_num = scala.io.StdIn.readLine("Input your guess number > ").toInt while(guess_num != answer || guess_count < 5){ ====> guess_count += 1 // <============================== var situation = if(guess_num > answer){"Your guess is higher!"}else{"Your guess is lower!"} println(situation) guess_num = scala.io.StdIn.readLine("Input your guess number > ").toInt } if(guess_num == answer){ println("Congratulation....You win!!") }else{ println("You hav run out of guess!") }

I get this error:

Error:(16, 25) value += is not a member of Int

Expression does not convert to assignment because receiver is not assignable.
guess_count.toInt += 1

Teimuraz · Accepted Answer · 2017-09-12 14:06:45Z

9

guess_count is immutable, (val), you cannot change it. Use var if you need to change the variable.

answered Sep 12, 2017 at 14:06

Teimuraz

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Comments

prasad · Accepted Answer · 2017-09-12 14:04:11Z

you can increment in scala, but the wrong is you are incrementing and re assigning the value to a final variable, that's why it's throwing error, please change the declaration as below then it will work

var guess_count:Int = 0

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