Question

Write the java code to prompt a user for a value greater than 0 and less than 1. Keep prompting until a valid entry is made. Use a boolean variable valid and a while loop.

For example:
Scanner in = new Scanner(System.in);
boolean valid = false;
double input = 0;
while (Ivalid)
{
//continue code here
}

Answer 1

The code example provided uses a while loop in Java to keep prompting the user for a value greater than 0 and less than 1 until valid input is obtained, utilizing the Scanner class for input and a boolean for validation.

Step-by-step explanation:

To prompt a user for a value greater than 0 and less than 1 in Java, you can use the following code snippet which employs a while loop and a boolean variable to validate the input. The code uses the Scanner class to read user input.

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
boolean valid = false;
double input = 0;

while (!valid) {
System.out.print("Enter a value greater than 0 and less than 1: ");
input = in.nextDouble();
if (input > 0 && input < 1) {
valid = true;
} else {
System.out.println("Invalid input. Please try again.");
}
}

System.out.println("You entered: " + input);
in.close();
}
}

The code will continue to prompt the user until a valid number between 0 and 1 is entered.

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

boolean valid = false;

double input = 0;

while (!valid) {

System.out.print("Enter a value greater than 0 and less than 1: ");

input = in.nextDouble();

valid = (input > 0 && input < 1);

if (!valid) {

System.out.println("Invalid entry. Please try again.");

}

}

}

}