CODEWITHSUNDEEP
javaif-statementdoublefalse-positive
Alex Lab
Alex Lab

Reputation: 63

Method returns negative value

I am trying to create a method that checks if an input is a double that is greater than zero. Checking if it is indeed a double is working fine with my code, but, even though when entering negatives its prompts to reenter the value, in the end, after entering a positive value it returns the negative entered earlier

 public static double isValid(double v){
    Scanner scan = new Scanner(System.in);
    if (scan.hasNextDouble()){
     v = scan.nextDouble();
     if (v<=0) {
        System.out.println("You have to use a positive number");
        isValid(v);
     }
     else {
        return v;
     }
  }
  else {
     System.out.println("Thats not how it works");
     isValid(v);
  }
  return v;
}

Upvotes: 1

Views: 1321

Answers (1)

Carcigenicate
Carcigenicate

Reputation: 45750

You need to return the result of your recursive calls:

return isValid(v);

It's returning the last invalid value because after returning from the recursive call, execution continues down to the return at the bottom of the method, returning v. At this point, v is the last invalid value.

Upvotes: 2

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