Java precision

[paradox6996]

import java.util.Scanner;
 
public class Program01C
{
 
 public static void main(String[] args)
 {
  double purchase, totalTax, salesTax, countyTax, total;
  salesTax = 0.04;
  countyTax = 0.02;
 
 
  Scanner keyboard = new Scanner(System.in);
  System.out.print("Enter the amount of purchase: ");
  purchase = keyboard.nextInt();
 
  totalTax = (salesTax + countyTax);
  total = (((totalTax) * purchase) + purchase);
  System.out.println("Sales Tax:" + salesTax + "\nCounty Tax:" + countyTax + "\nTotal Sales Tax:" + totalTax + "\nTotal Purchase:" + purchase + "\nTotal Amount of Purchase:" + total);
 
I want to add precision to total variable at the end of the program by 2, but forgot how to do it:
 
"\nTotal Amount of Purchase:" + total);
 
Thanx, Paradox(>")>
 
Question num# 2:
 
import java.util.Scanner;
 
public class Program01B
{
 
 public static void main(String[] args)
 {
  double testScore01, testScore02, testScore03, totalAverage, totalAveragemod;
 
  Scanner keyboard = new Scanner(System.in);
  System.out.print("Enter Test Score 1:");
  testScore01 = keyboard.nextInt();
  System.out.print("Enter Test Score 2:");
  testScore02 = keyboard.nextInt();
  System.out.print("Enter Test Score 3:");
  testScore03 = keyboard.nextInt();
 
//Division of 3 testscores plus remainder(Modulus)
  totalAverage = ((testScore01 + testScore02 + testScore03) / 3);
  totalAveragemod = ((testScore01 + testScore02 + testScore03) % 3);
 
  System.out.println("Test Score 1:" + testScore01 + "\nTest Score 2:" + testScore02 + "\nTest Score 3:" + testScore03 + "\nTotal Average of Test Scores:" + totalAverage + "." + totalAveragemod);
 }
}  
 

The modulus outputs as so:
Enter Test Score 1:80
Enter Test Score 2:90
Enter Test Score 3:80
Test Score 1:80.0
Test Score 2:90.0
Test Score 3:80.0
Total Average of Test Scores:83.33333333333333.1.0

How can I make so it outputs in decimal form(00.00) or if it needs to have precision added to it then ok, but it has 3 decimal places so IDK!

Thanx, Paraodx(>")>

[r035198x]

Have a look at System.out.printf

[horace1]

Java has similar formatted output facilities to printf() in C, see
http://java.sun.com/developer/techni...mming/sprintf/

[JosAH]

@horace1
That article is soooo old; better read what r035198x wrote.

kind regards,

Jos

[paradox6996]

I changed the code to this:

//Robert Burns
//Feb. 5, 2009
//[e-mail]
//Program01B-Calculates total average of test scores
 
import java.util.Scanner;
import static java.lang.Math.*;
 
public class Program01B {
 
 public static void main(String[] args) {
 
  double testScore01, testScore02, testScore03, totalAverage, totalAveragemod;
 
  Scanner keyboard = new Scanner(System.in);
  System.out.print("Enter Test Score 1:");
  testScore01 = keyboard.nextDouble();
  System.out.print("Enter Test Score 2:");
  testScore02 = keyboard.nextDouble();
  System.out.print("Enter Test Score 3:");
  testScore03 = keyboard.nextDouble();
 
//Division of 3 test scores plus remainder(Modulus)
  totalAverage = ((testScore01 + testScore02 + testScore03) / 3);
  totalAveragemod = ((testScore01 + testScore02 + testScore03) % 3);
 
  System.out.printf("Test Score 1:" + testScore01 + "\nTest Score 2:" + testScore02 + "\nTest Score 3:" + testScore03 + "\nTotal Average of Test Scores:%.2f", totalAverage, Math.ceil(totalAverage));
 }
}  

This is the output:

Enter Test Score 1:85
Enter Test Score 2:90.5
Enter Test Score 3:88.2
Test Score 1:85.0
Test Score 2:90.5
Test Score 3:88.2
Total Average of Test Scores:87.90

Thanx for the help, Paradox(>")>

[JosAH]

You don't need that variable totalAveragemod at all.

kind regards,

Jos

[paradox6996]

@JosAH
I know I took it out to get this:

//Robert Burns
//Feb. 5, 2009
//[e-mail]
//Program01B-Calculates total average of test scores
 
import java.util.Scanner;
 
//Math class so I can truncate doubles to get nice looking decimals 
import static java.lang.Math.*;
 
public class Program01B {
 
 public static void main(String[] args) {
 
  double testScore01, testScore02, testScore03, totalAverage;
 
  Scanner keyboard = new Scanner(System.in);
  System.out.print("Enter Test Score 1:");
  testScore01 = keyboard.nextDouble();
  System.out.print("Enter Test Score 2:");
  testScore02 = keyboard.nextDouble();
  System.out.print("Enter Test Score 3:");
  testScore03 = keyboard.nextDouble();
 
//Division of 3 test scores
  totalAverage = ((testScore01 + testScore02 + testScore03) / 3);
 
  System.out.printf("Test Score 1: " + testScore01 + "\nTest Score 2: " + testScore02 + "\nTest Score 3: " + testScore03 + "\nTotal Average of Test Scores: %.2f", totalAverage, Math.ceil(totalAverage));