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Thread: Need help with printf

  1. #1
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    Default Need help with printf

    Hi, so, I'm having trouble using printf because everytime I try to use it this error comes up
    Enter the year you were born: 
    1993
    Your age is: 21
    You've lived Exception in thread "main" java.util.MissingFormatArgumentException: Format specifier '.2f'
    	at java.util.Formatter.format(Unknown Source)
    	at java.io.PrintStream.format(Unknown Source)
    	at java.io.PrintStream.printf(Unknown Source)
    	at Life_Expectancy.main(Life_Expectancy.java:28)

    This is my code and I need to get it to 2 decimal places. Please help!
    import java.util.Calendar;
    import java.util.Scanner;
     
    public class Life_Expectancy {
    	public static void main(String[] args) {
    		//What values - Avg. life expec. = 77.9
    		int year = 0000;
    		int born = 0;
    		int age = 0;
    		double percentage = 0;
    		final double avgLife = 77.9;
     
    		Scanner input = new Scanner(System.in);
    		//User inputs year born
    		System.out.println("Enter the year you were born: ");
    		born = input.nextInt();
     
    		//Get current year (to help calculate age)
    		year = Calendar.getInstance().get(Calendar.YEAR);
    		//Calculate age and percentage lived
    		age = (year - born);
    		// %/100 = age/avgLife 
    		percentage  = ((age / avgLife) * 100);
    		//output (format decimal to 2 places)
    		System.out.println("Your age is: " + age);
    		System.out.printf("You've lived %.2f" +  percentage + "% of your life.");
     
    	}
    }


  2. #2
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    Default Re: Need help with printf

    Hi. The problem is at

    System.out.printf("You've lived %.2f" +  percentage + "% of your life.");

    Here's a quick and handy guide on printf: http://web.cerritos.edu/jwilson/Site..._reference.pdf

    See also Learning Java - Chapter 5 : Tech.

  3. The Following User Says Thank You to jashburn For This Useful Post:

    Elyril (March 9th, 2014)

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