Java -- Printing stuff twice

Question

My program asks the user to enter a choice (1, 2, 3, or 0). Choice 1 asks the user to enter feet and inches. Choice 2 asks the user to enter centimeters. Each time I do this, the program prints double of what I need (please see below):

Enter choice: 1

Enter feet: 12

Enter inches: 2

Enter feet: 12 //This second part should not happen

Enter inches: 2

I have tried commenting out the addConversion(...) line, but this does not allow me to print choice 3 properly. When I comment out System.out.println(feetInchesToCm()) my conversion for that case is not printed.

The main function of my code is as follows:

public static void main(String[] args) throws NumberFormatException, IOException
{
    int choice;

    do
    {
        displayMenu();

        choice = getInteger("\nEnter choice: ", 0, Integer.MAX_VALUE);
        if(choice == 1)
        {
            addConversion(feetInchesToCm());
            System.out.println("");
            System.out.println(feetInchesToCm());
        }
        else if(choice == 2)
        {
            addConversion(cmTofeetInches());
            System.out.println("");
            System.out.println(cmTofeetInches());
        }
        else if(choice == 3) 
        {                       
            if(_prevConversions == null)
            {
                break;
            }
            else if(_prevConversions != null)
            {
                for(int i = 1; i <= _numConversions; i++)
                {
                    System.out.print("Conversion # " + i + ": ");
                    System.out.println(_prevConversions[i]);
                }
            }
        }
    }while(choice != 0);
    if(choice == 0)
    {
        System.out.println("\nGoodbye!");
        System.exit(0); //Ends program
    }
}

Thank you in advance for your assistance!

Answer 1

You've explicitly called your method twice

Save the return value, or don't call it again.

For example

  if(choice == 1)
    {
        int cm = feetInchesToCm();
        addConversion(cm);
        System.out.println("");
        System.out.println(cm);
    }

Or, if you don't need to save the value in order to print it, just call addConversion directly on the returned value

  if(choice == 1)
    {
        System.out.println("");
        addConversion(feetInchesToCm());
    }