I am writing a simple program to calculate the average of a set of numbers. You get the numbers using Scanner
, so I am using while
loop with .has
Yes, the magic keyword is break;
public static void main(String[] args){
Scanner Input = new Scanner(System.in);
System.out.println("Enter # to end ");
while( !Input.hasNextInt("#"))// return true if u input value = its argument
{
//ur code
}//end while
You could simply use the keyword break
to stop the while loop:
while(Input.hasNextInt()){
count++;
temp = Input.nextInt();
sum += temp;
System.out.println(temp);
System.out.println(count);
break;
} // End of while
The break;
statement can be sued to... well... break out of an iteration. And by iteration I mean you can get out of a for
too, for example.
You have to define WHEN do you want to break out of the iteration and then do something like this:
while(Input.hasNextInt(Input)){
if(condition())
break;
count++;
temp = Input.nextInt();
sum += temp;
System.out.println(temp);
System.out.println(count);
}
Otherwise, you can make an auxiliary method that defines if the iteration should keep on going, like this one:
private boolean keepIterating(Scanner in) {
boolean someOtherCondition = //define your value here that must evaluate to false
//when you want to stop looping
return Input.hasNextInt() && someOtherCondition;
}
Method that you will have to invoke in your while
:
while(keepIterating()){
count++;
temp = Input.nextInt();
sum += temp;
System.out.println(temp);
System.out.println(count);
}
The problem is that Scanner
will always expect an integer from System.in
. You could break out of the loop using a sentinal value e.g. -1
:
if (temp == -1) {
break;
}