I'm making a program which convert Celsius to Fahrenheit and opposing too but I have a bug when you say you want to convert another value. Please can someone find and solve the problem it is since 2 days I'm searching.

Question

import java.util.Scanner;

public class Conversion {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);

double converted=0;
char answer=' ', choice= ' ';

System.out.println("Convertion of Celsius and Farenheit degrees");

do{

do{
System.out.println("Choose the unit of the number you'll type in C/F");
choice = sc.nextLine().charAt(0);

if(choice != 'C' && choice != 'F')
System.out.println("Unknown unit, retry.");

}while (choice != 'C' && choice != 'F');

System.out.println("Temperature");
while(!sc.hasNextDouble()) {
System.out.println("This isn't a number, retry.");
sc.next();
}
double toConvert = sc.nextDouble();
sc.nextLine();

if(choice == 'C'){
converted = ((9.0/5.0) * toConvert) + 32.0;
System.out.print(toConvert + " °C is : ");
System.out.println((converted) + "in °F.");

}
else{
converted = ((toConvert - 32) * 5) / 9;
System.out.print(toConvert + " °F is ");
System.out.println((converted) + "in °C.");
}

do{
System.out.println("Do you want to convert another temperature ?(Y/N)");
Scanner sc1 = new Scanner(System.in);
answer = sc1.nextLine().charAt(0);
sc1.close();
sc1.nextLine();

}while(answer != 'Y' && answer != 'N');

}while(answer == 'Y');

System.out.println("Bye!");
sc.close();
}

}

Answer 1

first of all there's an error undefined variable choix I think that's a typo though at while(choice != 'c' && choice!= 'f')

Remove sc1.close and sc1.next line at your last do while loop