Java precision

[paradox6996]

[code=java]import java.util.Scann er;

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.prin t("Enter the amount of purchase: ");
purchase = keyboard.nextIn t();

totalTax = (salesTax + countyTax);
total = (((totalTax) * purchase) + purchase);
System.out.prin tln("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.Scann er;

public class Program01B
{

public static void main(String[] args)
{
double testScore01, testScore02, testScore03, totalAverage, totalAveragemod ;

Scanner keyboard = new Scanner(System. in);
System.out.prin t("Enter Test Score 1:");
testScore01 = keyboard.nextIn t();
System.out.prin t("Enter Test Score 2:");
testScore02 = keyboard.nextIn t();
System.out.prin t("Enter Test Score 3:");
testScore03 = keyboard.nextIn t();

//Division of 3 testscores plus remainder(Modul us)
totalAverage = ((testScore01 + testScore02 + testScore03) / 3);
totalAveragemod = ((testScore01 + testScore02 + testScore03) % 3);

System.out.prin tln("Test Score 1:" + testScore01 + "\nTest Score 2:" + testScore02 + "\nTest Score 3:" + testScore03 + "\nTotal Average of Test Scores:" + totalAverage + "." + totalAveragemod );
}
}
[/code]
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:83.33333 333333333.1.0

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.prin tf

[horace1]

Java has similar formatted output facilities to printf() in C, see

http://java.sun.com/developer/technicalArticles/Programming/sprintf/

[JosAH]

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

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
//paradox6996@gmail.com
//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]

You don't need that variable totalAveragemod at all.

kind regards,

Jos

I know I took it out to get this:

//Robert Burns
//Feb. 5, 2009
//paradox6996@gmail.com
//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));