//Prompts the user for a double. if the user fails to supply a correct double after 3 attempts, the program exits
public double readDouble(Scanner console)
{
boolean correct = false;
int attempts = 0;
double number = 0.0;
do
{
try
{
System.out.println("Please enter a double: ");
String in = console.nextLine();
number = Double.parseDouble(in);
correct = true;
}catch(NumberFormatException nfe)
{
System.out.println("ERROR: You did not enter a double");
correct = false;
}

attempts++;
}while(!correct && attempts < 3);

if(attempts == 3)
System.exit(1); //exit with 1 to indicate there was an error

return number;
}

import java.util.Scanner;


public class Calc {

public static void main(String[] args) {
// TODO Auto-generated method stub

int count;
count = 0;
Scanner input = new Scanner(System.in);
System.out.println("Menu: Welcome to Basic Calculator \n "
+ "1. Add \n "
+ "2. Subtract \n "
+ "3. Divide \n "
+ "4. Multiply \n "
+ "5. Generate Random Number \n "
+ "6. Quit \n ");
//Menu for Operations

String in = input.next();
char oper = in.charAt(0);


while (count < 3) {


if (oper == '6') {
System.out.println("Your have chosen to Quit. Thank you for using Basic Calculator!");
System.exit(0);

}

else





if (oper == '1') {
in = input.nextLine();
System.out.print("Enter your first number ");
in = input.nextLine();
double num1 = Double.parseDouble(in);

System.out.print("Enter your second number to perform your selected operation ");
in = input.nextLine();
double num2 = Double.parseDouble(in);
double result = num1 + num2;
System.out.println("Your answer is: " + result);


} else if(oper == '5') {in = input.nextLine();
System.out.print("Enter your first number ");
in = input.nextLine();
double num1 = Double.parseDouble(in);

System.out.print("Enter your second number to perform your selected operation ");
in = input.nextLine();
double num2 = Double.parseDouble(in);
double result = (num1 * num2 + num1 + num2 + 77);
System.out.println("Your answer is: " + result);


} else if(oper == '2') {in = input.nextLine();
System.out.print("Enter your first number ");
in = input.nextLine();
double num1 = Double.parseDouble(in);

System.out.print("Enter your second number to perform your selected operation ");
in = input.nextLine();
double num2 = Double.parseDouble(in);
double result = num1 - num2;
System.out.println("Your answer is: " + result);


} else if(oper == '4') {in = input.nextLine();
System.out.print("Enter your first number ");
in = input.nextLine();
double num1 = Double.parseDouble(in);

System.out.print("Enter your second number to perform your selected operation ");
in = input.nextLine();
double num2 = Double.parseDouble(in);
double result = num1 * num2;
System.out.println("Your answer is: " + result);


} else if(oper == '3') {in = input.nextLine();
System.out.print("Enter your first number ");
in = input.nextLine();
double num1 = Double.parseDouble(in);

System.out.print("Enter your second number to perform your selected operation ");
in = input.nextLine();
double num2 = Double.parseDouble(in);
double result = num1 / num2;
System.out.println("Your answer is: " + result);
}

else
System.out.println("Sorry, you have entered an invlaid option. Please try again");
System.out.println("You have: " + count + "trys remaining");
count++;



}

}
{

}

}