Java program not showing output

Question

This is the coding i have come up with for a simple car rent java program. it compiles with no error but the output is not showing, so what should i do? Please help tx. I am a java beginner.

import java.util.Scanner;
public class carRent
{
  public static void main(String args[])
  {
    Scanner input = new Scanner(System.in);
    String name, address;
    double bodo,endodo, kilo;
    double days, charge;

    System.out.print("Name: ");
    name=input.nextLine();
    System.out.print("State: ");
    address=input.nextLine();
    System.out.print("Beginning Odometer : ");
    bodo=input.nextDouble();
    System.out.print("End Odometer : ");
    endodo=input.nextDouble();
    System.out.print("Days car used : ");
    days=input.nextDouble();


    kilo = endodo - bodo;
    System.out.printf("\nKilometer car driven  : ", + kilo ,"km");
    System.out.printf("\nNumber of days rented : ", + days);
    charge = days * 150.00 + kilo * 1.00;
    System.out.printf("\nTotal charge of rent  : ", + charge);
    } 
}

System.out.printf("%nKilometer car driven :%f.2km", kilo); — MadProgrammer
– MadProgrammer, Commented Mar 14, 2015 at 4:33
That's what %.2f does...Take a look at this for more examples — MadProgrammer
– MadProgrammer, Commented Mar 14, 2015 at 5:00

Eran · Accepted Answer · 2015-03-14 04:27:16Z

3

You are not using printf correctly (since you didn't specify any place holders for the variables in the format String). I suggest you use println instead :

    kilo = endodo - bodo;
    System.out.println("\nKilometer car driven  : " + kilo + "km");
    System.out.println("\nNumber of days rented : " + days);
    charge = days * 150.00 + kilo * 1.00;
    System.out.println("\nTotal charge of rent  : " + charge);

Sample input and output :

Name: Eran
State: IL
Beginning Odometer : 1000
End Odometer : 2000
Days car used : 2

Kilometer car driven  : 1000.0km

Number of days rented : 2.0

Total charge of rent  : 1300.0

answered Mar 14, 2015 at 4:27

Eran

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5 Comments

user3544721 Over a year ago

how may i set the output to two decimal places?

MadProgrammer Over a year ago

@user3544721 Using this method, you need to use a NumberFormat, using printf, something like System.out.printf("%nKilometer car driven :%f.2km", kilo);

user3544721 Over a year ago

but it displays like eg 60.000000.2 which is weird. why is that?

MadProgrammer Over a year ago

Yeah sorry, it should be %0.2f :P

user3544721 Over a year ago

like for the days i would like t display as an integer how do i convert from double to integer?

MadProgrammer · Accepted Answer · 2015-03-14 06:35:21Z

1

printf is short for "print format" which takes a format String and parameters with which they need to be formatted...

Instead you should be using something more like...

System.out.printf("%nKilometer car driven  : %.2fkm", kilo);

Which can output something like...

Name: test
State: Test
Beginning Odometer : 123.456
End Odometer : 789.123
Days car used : 10.25

Kilometer car driven  : 665.67km
Number of days rented : 10
Total charge of rent  : 2203.17

For example of the values...

    System.out.printf("%nKilometer car driven  : %.2fkm", kilo);
    System.out.printf("%nNumber of days rented : %.0f", days);
    charge = days * 150.00 + kilo * 1.00;
    System.out.printf("%nTotal charge of rent  : %.2f%n", charge);

For more details, take a look at these examples

edited Mar 14, 2015 at 6:35

answered Mar 14, 2015 at 5:06

MadProgrammer

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Comments

Joseph Furfaro · Accepted Answer · 2015-03-14 05:22:38Z

0

If you want to be able to add multiple Strings on one line use:

System.out.print("I am an example String!");

If you want the String to be on its own line use:

System.out.println("I am an example String on my own line!");

edited Mar 14, 2015 at 5:22

answered Mar 14, 2015 at 4:30

Joseph Furfaro

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Comments

sampathsris · Accepted Answer · 2015-03-14 05:28:43Z

0

I would suggest using:

System.out.println("Insert String Here");

Rather than printf, since you are not using placeholders .

edited Mar 14, 2015 at 5:28

sampathsris

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answered Mar 14, 2015 at 4:55

Alfred Morgan

1

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