Question

I'm having a problem with my java program, error says that a certain variable might not have been initialized. But that variable have been initialized inside a loop. What should I do?

Answer 1

can you share the code?

Answer 2

here:
//gets the sum of the first and last digit of a number...
import javax.swing.JOptionPane;
public class FirstAndLastDigits
{
public static void main(String[] args)
{
String numberStr;
int number;
int firstDigit;
int lastDigit;
int sum;
int x = 1;
numberStr = JOptionPane.showInputDialog(null,"Enter a number not less than 4 digits","Number",JOptionPane.INFORMATION_MESSAGE);
number = Integer.parseInt(numberStr);
while (x > 0)
{
firstDigit = number / 10;
x++;
}
lastDigit = number % 10;
sum = firstDigit + lastDigit;
JOptionPane.showMessageDialog(null,"Number: " + number + "\nFirst Digit: " + firstDigit + "\nLast Digit: " + lastDigit + "\nSum: " + sum);
}
}

Answer 3

it says that the variable firstDigit might not have been initialized

Answer 4

I am not sure about the error but I can see some problem in the logic. For the first digit logic doesn't look correct to me. This will be an infinite loop

Answer 5

Oh yes, you're right. I'll try to solve it. Thanks. I'm still open for suggestions.

Answer 6

save ur number to a temp variable x . Then check if x/10 >0. if yes then first digit = x/10 and x =x/10

Answer 7

like this?
x = number;
if (x / 10 > 0)
{
firstDigit = x / 10;
x = x/10;
}

Answer 8

yes!
actually there is no need to have firstDigit varibale after the loop value of x will give you firstDigit