Temperature Calculator for Java

I would like your assistance on an upcoming assignment. I did some research and was able to come up with similar questions but no one was having the same issue as I am. I am receiving errors during compilation. Its expecting a .class. I don't think it should require one. Im pretty new at coding so forgive my ignorance. I also would like some guidance on how to nullify Case when the user inputs C or F so they can put c or f and not get an error messages. Thank you

//Author: Austin J. Harlan
// CS-12300 Temp Calc

  import java.util.Scanner;
  import java.util.InputMismatchException;
  public class TempCALC
  {
    public static void main(String[] args) 
    {
  System.out.println("This Program will allow the user to calculate temperature.");
  calculateTemp();
}
private static void calculateTemp() {
  int F;
  int C;
  F=0;
  C=1;
  Scanner input = new Scanner (System.in);
  System.out.println("Please enter a F to convert Fahrenheit to Celsius.");
  System.out.println("Please enter a C to convert Celsius to Fahrenheit.");
  int option = input.nextInt();
  if (int=0) {
    System.out.println("Please enter a temperature in degrees Fahrenheit.");
    ftoc();
  } else if (int= 1) {
    System.out.println("Please enter a temperature in degrees Celsius.");
    ctof();
  } else {
    System.out.println("ERROR PLEASE ENTER A F OR A C TO PROCEED!");
  }
}
private static void ftoc() {
  Scanner input = new Scanner(System.in);
  Double celsius = input.nextDouble();
  System.out.println(celsius + "celsius is" + ((celsius * 9 / 5.0) + 32) + "Fahrenheite");
  calculatetemp();
}
private static void ctof() {
  Scanner input = new Scanner(System.in);
  Double Fahrenheit = input.nextDouble();
  System.out.println(Fahrenheit + "Fahrenheit is" + ((Fahrenheit - 32) * (5 / 9.0)) + "Celsius");
  calculatetemp();
}
private static void print(String string); {
  System.out.println("\n" + string);
}
  }