Scanner Java

Question

Hello, i'm beginner with JAVA wish restart the scanner for enter another numbers...Do you know can i do please ?

my code:

package claudeDelannoy;

import java.util.Scanner;

public class ex18racineCarre {

public static void main(String[] args) {
// programme calcule les racines carrees
// stop quand on lui donne 0
// refus valeurs négatives

// demander un nombre positif
System.out.println("donnez un nombre positif: ");
Scanner sc = new Scanner(System.in);
double nombre = sc.nextDouble();

sc.close();

do {
// refus valeurs négatives
if (nombre < 0) {
System.out.println("svp positif");
}
// calcule les racines carrees
if (nombre > 0) {
System.out.println("sa racine carree est: " + Math.sqrt(nombre));
break;
}
} while (nombre != 0);// si on lui donne 0 = stop

}
}

Answer 1

I usually put my scanner in a loop if I want to repeat the query

Scanner userInput = new Scanner (System.in)

String restart = "";

do{

//your code

System.out.println("insert another number?") ;

restart = userInput.nextLine();

} while(restart.equalsIgnoreCase("Y") || restart.equalsIgnoreCase("yes");

As long as user responds with "yes", the code will run again and you'll be able to insert more numbers

Answer 2

Thanks very well, i have done that before with a char 'y'... for this exercice i want the user can enter a number while it s different 0 without asking