Question

It’s probably something obvious, but when I’m trying to force the user to keep entering a value until he enters a valid value, I get an error that the variable cannot be resolved.

Then if I declare it beforehand I get an error saying duplicate value.

do {
    float x = Float.parseFloat(javax.swing.JOptionPane.showInputDialog("Enter 1");
} while (x != 1);

Isn’t the compiler supposed to execute the do statement first, before worrying about the while?

Answer 1

declare x before the loop, make its scope more broder like below :

float x = 0.0f;
do {
    x = Float.parseFloat(javax.swing.JOptionPane.showInputDialog("Enter 1"); 
} while (x != 1);