Question

Truncating Decimal Numbers

Asked by: rivergr

In the below program the output is coming with decimal numbers. I want to Truncate the decimal numbers in the output.  How to do that?




/* WRITE AND TEST A JAVA PROGRAM TO CONVERT A GIVEN TEMPERATURE IN FAHRENHEIT
   TO CELCIUS USING THE FOLLOWING CONVERSION FORMULA: F-32/1.8 AND DISPLAY
   THE VALUES IS TABULAR FORM */

 /* TEMPERATURE CONVERSION */
 import java.io.DataInputStream;
 class tempcon
 {
 public static void main(String args[])
 {
 int a;
 float f=0.0f;
 double c=0.0;
 DataInputStream in=new DataInputStream(System.in);
 try
 {
 System.out.println("%*%*%*%*%*%*%OUTPUT%*%*%*%*%*%*%*%*");
 System.out.println("Enter the value of a");
 a=Integer.parseInt(in.readLine());
 System.out.println(+a);
 System.out.println("Enter the temperature in fahrenheit");
 f=Float.valueOf(in.readLine()).floatValue();
 System.out.println(f);
 System.out.println("fahr\t celcius");
 System.out.println("*!*! \t *!*!*!*!*!*!*!*!");
 for(int i=1;i<=a;i++)
 {
 c=(f-32)/1.8;
 System.out.println("\n" +f+ "\t" +c);
 f=f+1;
 }
 }
 catch(Exception e)
 {
 }
 }
 }



%*%*%*%*%*%*%OUTPUT%*%*%*%*%*%*%*%*
Enter the value of a
5
Enter the temperature in fahrenheit
48.0
fahr       celcius
*!*!        *!*!*!*!*!*!*!*!

48.0      8.88888888888889

49.0      9.444444444444445

50.0      10.0

51.0      10.555555555555555

52.0      11.11111111111111
%*%*%*%*%*%*%*%*%*%*%*%*%*%*%*%*%*%*

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Asked On
2003-08-22 at 02:22:49ID20717075
Tags

truncating

,

java

,

decimal

,

number

Topic

Java Programming Language

Participating Experts
5
Points
60
Comments
5

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Answers

 

by: yongsingPosted on 2003-08-22 at 02:28:01ID: 9201801

(1) Change:

System.out.println(f);

to

System.out.println((int)f);


(2) Change:

System.out.println("\n" +f+ "\t" +c);

to

System.out.println("\n" +f+ "\t" + (int)c);

 

by: ThangamanirPosted on 2003-08-22 at 03:32:35ID: 9202027

Use Math.round() , Math.floor() , Math.ceil() methods.

System.out.println("\n" +f+ "\t" +Math.round(c)); // will round it to the nearest possible integer

 

by: michael_foyPosted on 2003-08-22 at 13:27:03ID: 9206486

or use decimal format to select the output format using the defined format specifications.

see java.text.DecimalFormat

 

by: uniarPosted on 2003-08-23 at 09:50:34ID: 9209251

Also, if you're looking to round to a certain decimal place, try multiplying the number by the number of places that you'd like to round to, using the Math.round() function, and then dividing by that number again.  For example, to round the number 25.674 to 2 decimal places, do the following:

double b = 25.674*100;
Math.round(b);
b = b/100;

Similarly, to round to 3 decimal places:

double b = 25.6747*1000;
Math.round(b);
b=b/1000;

 

by: ChrisTaylorAtThreePosted on 2003-11-05 at 08:04:49ID: 9687735

To use a number formatter:

NumberFormat nf = DecimalFormat.getNumberInstance();
nf.setMaximumFractionDigits(2);
nf.setGroupingUsed(false);
new Double(nf.format("3.14179"));

20120131-EE-VQP-002

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