使while循环重新询问用户的输入

Question

So in this section of my program I'm trying to make the program re-ask for input from the user.

The problem is that is says the int have already been declared. But how do I get the input for the question again?

Scanner keyboard = new Scanner(System.in);

System.out.println("Please enter possible and actual points for participation: ");
int pparticipation = keyboard.nextInt();
int aparticipation = keyboard.nextInt();

while (aparticipation > pparticipation || pparticipation < 0){
   System.out.println("Please enter possible and actual points for participation: ");
   int pparticipation = keyboard.nextInt();
   int aparticipation = keyboard.nextInt();
}

Answer 1

You declared the variables twice. Removing the "int" from the variables in the loop should get it working.

int aparticipation; that is declaring a variable. To assign a value to the variable after that you just do aparticipation = keyboard.nextInt();

You already declared it so you dont have to tell the compiler that its an int again.

Answer 2

The error is occurring because you are trying to declare pparticipation and aparticipation again within the loop. Remove the type (int) from in front of those two variables.

Answer 3

All you have to do is to change the following :-

while (aparticipation > pparticipation || pparticipation < 0){
   System.out.println("Please enter possible and actual points for participation: ");
   int pparticipation = keyboard.nextInt();
   int aparticipation = keyboard.nextInt();
}

to

while (aparticipation > pparticipation || pparticipation < 0){
   System.out.println("Please enter possible and actual points for participation: ");
   pparticipation = keyboard.nextInt();
   aparticipation = keyboard.nextInt();
}

The variables are already declared, so don't do it again.